JP2018171228A - Subjective optometric apparatus - Google Patents

Abstract

A subjective optometry apparatus and a subjective optometry program capable of easily and accurately performing a subjective examination. Light projecting optical systems 45 and 46 that project a target light beam toward an eye to be examined; a correction optical system 60 that is disposed in an optical path of the light projecting optical system and changes an optical characteristic of the target light beam; And an optical member that guides the target luminous flux corrected by the correction optical system to the eye to be examined. The target luminous flux is guided to the eye to be examined by passing through an optical path off the optical axis of the optical member. A subjective optometry apparatus for subjectively measuring optical characteristics of a subject's eye using a target luminous flux guided to the optical path, by passing the optical path of the target luminous flux off the optical axis of the optical member Correction means for correcting distortion of the target luminous flux generated. [Selection] Figure 2

Description

  The present disclosure relates to a subjective optometry apparatus for measuring optical characteristics of an eye to be examined.

  Optical characteristics (refractive power, etc.) of the subject's eye are measured by placing an optical member such as a spherical lens or a columnar lens in front of the subject's eye and presenting a test target to the subject's eye via this optical member. A self-conscious optometry apparatus is known (see Patent Document 1).

JP-A-5-176893

  In the subjective examination, alignment (alignment) between the eye to be examined and the subjective optometry apparatus is performed, and an examination target corresponding to the eye refractive power of the eye to be examined is presented to the eye to be examined. However, when the target luminous flux is incident on the optical member from the off-axis, the test target guided to the eye to be examined may be distorted. In this state, since the inspection target deformed due to the distortion is guided to the eye to be examined, it is difficult to correctly measure the optical characteristics of the eye to be examined.

  In view of the above prior art, it is an object of the present disclosure to provide a subjective optometry apparatus and a subjective optometry program that can easily and accurately perform a subjective examination.

  In order to solve the above problems, the present disclosure is characterized by having the following configuration.

(1) A subjective optometry apparatus according to the first aspect of the present disclosure includes a projection optical system that projects a target luminous flux toward an eye to be examined, an optical path of the projection optical system, and the target luminous flux. A correction optical system that changes the optical characteristics of the optical member, and an optical member that guides the target luminous flux corrected by the correction optical system to the eye to be examined. The target luminous flux is from an optical axis of the optical member. A subjective optometry apparatus for subjectively measuring optical characteristics of the eye to be examined using the target luminous flux that is guided to the eye to be examined through an off-optical path and guided to the eye to be examined. And correction means for correcting distortion of the target light beam caused by the optical beam passing through an optical path off the optical axis of the optical member.
(2) A subjective optometry apparatus according to a second aspect of the present disclosure includes a projection optical system that projects a target luminous flux toward an eye to be examined, an optical path of the projection optical system, and the target luminous flux. A correction optical system that changes the optical characteristics of the optical member, and an optical member that guides the target luminous flux corrected by the correction optical system to the eye to be examined. The target luminous flux is from an optical axis of the optical member. A subjective optometry apparatus for subjectively measuring optical characteristics of the eye to be examined using the target luminous flux that is guided to the eye to be examined through an off-optical path and guided to the eye to be examined. And correction means for correcting aberration caused by the target light flux passing through the optical path deviated from the optical axis of the optical member based on the correction power of the correction optical system.
(3) A subjective optometry program according to the third aspect of the present disclosure includes a projecting optical system that projects a target luminous flux toward an eye to be examined, an optical path of the projecting optical system, and the target luminous flux. A correction optical system that changes the optical characteristics of the optical member, and an optical member that guides the target luminous flux corrected by the correction optical system to the eye to be examined. The target luminous flux is from an optical axis of the optical member. Used in a subjective optometry apparatus for subjectively measuring optical characteristics of the eye to be examined using the target light flux that is guided to the eye to be examined through an off-optical path and guided to the eye to be examined. A subjective optometry program, which is executed by a processor of the subjective optometry apparatus, to cause distortion of the target luminous flux caused by the target luminous flux passing through an optical path off the optical axis of the optical member. The correction step for correcting It is characterized by causing an optometry apparatus to execute.

It is an external view of the subjective optometry apparatus according to the present embodiment. It is a figure explaining the structure of a measurement means. It is the schematic block diagram which looked at the inside of the subjective optometry apparatus from the front direction. It is the schematic block diagram which looked at the inside of the subjective optometry apparatus from the side surface direction. It is the schematic block diagram which looked at the inside of the subjective optometry apparatus from the upper surface direction. It is a figure which shows the control system of a subjective optometry apparatus. It is a figure which shows the anterior eye part image of the eye to be examined. It is a figure explaining alignment control. It is a figure explaining the inclination of the image surface of the image of a target light beam. It is a figure which shows the image surface of the image of the target light beam by the inclination of a display. It is a figure explaining distortion of a target light beam. It is a figure explaining correction | amendment of the distortion in a target light beam.

<Overview>
Hereinafter, one exemplary embodiment will be described with reference to the drawings. 1 to 12 are diagrams for explaining a subjective optometry apparatus according to the present embodiment. Note that the present disclosure is not limited to the apparatus described in the present embodiment. For example, terminal control software (program) that performs the functions of the following embodiments is supplied to a system or apparatus via a network or various storage media, and the system or apparatus control device (for example, CPU) reads the program. It is also possible to execute. In addition, the items classified by <> below can be used independently or in association with each other.

  In the following description, the depth direction (subject's front-rear direction) of the subjective optometry apparatus is the Z direction, the horizontal direction on the plane perpendicular to the depth direction (the subject's left-right direction) is the X direction, and the depth direction. The vertical direction (vertical direction of the subject) on the vertical plane will be described as the Y direction. In addition, L and R attached | subjected to a code | symbol shall show the object for left eyes and the object for right eyes, respectively.

  For example, the subjective optometry apparatus (for example, the subjective optometry apparatus 1) in the present embodiment subjectively measures the optical characteristics of the eye to be examined. For example, the subjective optometry apparatus may include a light projecting optical system (for example, the light projecting optical system 30). For example, the light projecting optical system projects a target light beam toward the eye to be examined and projects the target on the eye to be examined. For example, the subjective optometry apparatus may include a correction optical system (for example, the correction optical system 60 and the subjective measurement optical system 25). For example, the correction optical system is disposed in the optical path of the projection optical system, and changes the optical characteristics of the target luminous flux. Further, for example, the subjective optometry apparatus may include an optical member (for example, a concave mirror 85) that guides the target luminous flux corrected by the correction optical system to the eye to be examined.

  For example, the target luminous flux passes through an optical path off the optical axis of the optical member and is guided to the eye to be examined. For example, the subjective optometry apparatus according to the present embodiment subjectively measures the optical characteristics of the eye to be examined using an image of the target luminous flux guided to the eye to be examined. Further, for example, the subjective optometry apparatus according to the present embodiment subjectively measures the optical characteristics of the eye to be examined using the target luminous flux guided to the eye to be examined.

  For example, the optical characteristics of the eye to be measured subjectively include eye refractive power (eg, at least one of spherical power, cylindrical power, astigmatic axis angle, etc.), contrast sensitivity, binocular vision function (eg, oblique position) At least one of a quantity, a stereoscopic function, etc.).

<Projection optics>
For example, the light projecting optical system includes a light source (for example, the display 31) that irradiates the target luminous flux. Further, for example, the light projecting optical system may include at least one optical member that guides the target light beam projected from the light source that emits the target light beam toward the eye to be examined. For example, the light source that projects the target luminous flux may be configured to use a display. For example, an LCD (Liquid Crystal Display), an organic EL (Electro Luminescence), or the like is used as the display. For example, an inspection target such as a Landolt ring target is displayed on the display. Further, for example, a light source and a DMD (Digital Micromirror Device) may be used as a light source for projecting the target luminous flux. In general, DMD has high reflectivity and is bright. For this reason, compared with the case where the liquid crystal display using polarized light is used, the light quantity of a target light beam can be maintained.

  For example, the light source that projects the target luminous flux may have a target-presenting visible light source and a target plate. In this case, for example, the optotype plate is a rotatable disc plate and has a plurality of optotypes. For example, the plurality of visual targets include a visual test for visual acuity used at the time of subjective measurement. For example, a visual target for each visual acuity value (visual acuity values 0.1, 0.3,..., 1.5) is prepared as the visual acuity test target. For example, the optotype plate is rotated by a motor or the like, and the optotype is switched and arranged on an optical path through which the optotype luminous flux is guided to the eye to be examined. Of course, a light source other than that described above may be used as the light source for projecting the target luminous flux.

  For example, the light projecting optical system may include a left eye light projecting optical system and a right eye light projecting optical system provided in a pair of left and right. For example, in the left-eye projection optical system and the right-eye projection optical system, the members constituting the left-eye projection optical system and the members constituting the right-eye projection optical system are the same member. It may be configured. Further, for example, the left-eye projection optical system and the right-eye projection optical system are at least one of a member constituting the left-eye projection optical system and a member constituting the right-eye projection optical system. The member of a part may be comprised with a different member. Further, for example, the left-eye projection optical system and the right-eye projection optical system are at least one of a member constituting the left-eye projection optical system and a member constituting the right-eye projection optical system. The structure where the member of a part is combined may be sufficient. Further, for example, in the left-eye projection optical system and the right-eye projection optical system, a member constituting the left-eye projection optical system and a member constituting the right-eye projection optical system are separately provided. The structure provided may be sufficient.

<Correction optics>
For example, the correction optical system may be configured to change the optical characteristics (for example, at least one of spherical power, cylindrical power, cylindrical axis, polarization characteristics, and aberration amount) of the target luminous flux. For example, the configuration for changing the optical characteristics of the target luminous flux may be a configuration for controlling an optical element. For example, the optical element may be configured to use at least one of a spherical lens, a cylindrical lens, a cross cylinder lens, a rotary prism, a wavefront modulation element, and the like. Of course, for example, an optical element different from the optical element described above may be used as the optical element.

  For example, the correction optical system may be configured to correct the spherical power of the eye to be examined by optically changing the presentation position (presentation distance) of the target with respect to the eye to be examined. In this case, for example, the configuration for optically changing the presentation position (presentation distance) of the visual target may be a configuration in which a light source (for example, a display) is moved in the optical axis direction. Further, for example, as a configuration for optically changing the presentation position (presentation distance) of the visual target, a configuration in which an optical element (for example, a spherical lens) arranged in the optical path is moved in the optical axis direction may be used. . Of course, the correction optical system may be a combination of a configuration for controlling the optical element and a configuration for moving the optical element arranged in the optical path in the optical axis direction.

  For example, as a correction optical system, an optical element is disposed between an optical member for guiding a target light beam from the light projecting optical system toward the eye to be inspected, and a light source of the light projecting optical system. It may be configured to change the optical characteristics of the target luminous flux by controlling the element. In other words, the correcting means may be a phantom lens refractometer (phantom correcting optical system). In this case, for example, the target luminous flux corrected by the correction optical system is guided to the eye to be examined through the optical member.

  For example, the correction optical system may include a left-eye correction optical system and a right-eye correction optical system provided in a pair of left and right. For example, in the left-eye correction optical system and the right-eye correction optical system, the members constituting the left-eye correction optical system and the members constituting the right-eye correction optical system are configured by the same member. Also good. Further, for example, the left-eye correction optical system and the right-eye correction optical system include at least a part of members included in the left-eye correction optical system and members included in the right-eye correction optical system. You may be comprised with a different member. Further, for example, the left-eye correction optical system and the right-eye correction optical system include at least a part of members included in the left-eye correction optical system and members included in the right-eye correction optical system. The structure used also may be used. Further, for example, the left-eye correction optical system and the right-eye correction optical system have a configuration in which a member constituting the left-eye correction optical system and a member constituting the right-eye correction optical system are separately provided. There may be.

<Optical member>
For example, an optical member that guides the target luminous flux corrected by the correction optical system to the eye to be examined guides the target luminous flux or the image of the target luminous flux to the eye to be optically measured at a predetermined inspection distance. It may be an optical member. For example, a concave mirror may be used as the optical member. For example, by using a concave mirror, it is possible to optically present a visual target at a predetermined inspection distance in the subjective inspection means, and when presenting the visual target at a predetermined inspection distance, the actual distance is obtained. Thus, there is no need to arrange members or the like. This eliminates the need for extra members and space, and allows the apparatus to be miniaturized. Of course, for example, the optical member is not limited to a concave mirror. For example, the optical member may be configured to guide the target light beam or an image of the target light beam to the eye to be inspected optically at a predetermined examination distance. In this case, for example, a lens or the like may be used as the optical member.

<Correction of image plane of image with target luminous flux>
For example, the subjective optometry apparatus in the present embodiment may include correction means (for example, the control unit 70). For example, the correcting unit may be configured to correct the inclination of the image plane of the image of the target light beam that is generated when the target light beam passes through an optical path deviated from the optical axis of the optical member. In other words, the correction means may be configured to correct the inclination of the image plane of the target luminous flux image projected onto the fundus of the eye to be examined.

  As a result, the optical characteristics of the eye to be examined can be measured subjectively in a state where the inclination of the image plane of the image of the target luminous flux is reduced. Therefore, the examiner can accurately perform subjective measurement on the eye to be examined.

  For example, the correcting unit may correct at least a part of the image plane of the image in the target luminous flux. That is, the correcting unit may correct at least a part of the condensing position of the target luminous flux. For example, the correction unit may correct the entire image plane of the image in the target luminous flux. That is, the correction unit may correct the entire light collection position of the target luminous flux.

  For example, the correction means may be configured to correct the inclination of the image plane of the image of the target luminous flux by changing the angle of the display surface with respect to the optical axis. In this case, for example, the projecting optical system may have a display, and the target luminous flux is emitted by displaying the target on the display. For example, the examiner can easily correct the inclination of the image plane of the target luminous flux image by changing the angle of the surface of the display.

  For example, the display may be configured to be rotatable about a rotation axis extending in the vertical direction (Y direction) of the display. For example, the display is tilted in the horizontal direction (X direction) with respect to the optical axis direction of the light projecting optical system by rotating about the rotation axis extending in the vertical direction (vertical direction). That is, for example, the display may be configured such that the rotation angle in the horizontal direction (left-right direction) can be changed with respect to the optical axis of the light projecting optical system.

  For example, the display may be configured to be rotatable about a rotation axis extending in the horizontal direction (X direction) of the display. For example, the display is tilted in the vertical direction (Y direction) with respect to the optical axis direction of the light projecting optical system by rotating about the rotation axis extending in the horizontal direction (left-right direction). That is, for example, the display may be configured such that the rotation angle in the vertical direction (vertical direction) can be changed with respect to the optical axis of the light projecting optical system.

  For example, the display may be configured to be two-dimensionally rotatable. In this case, for example, the display may be configured to be driven to rotate about a rotation axis extending in the left-right direction and a rotation axis extending in the up-down direction by driving of the driving unit. That is, for example, the display may be configured such that the rotation angle in the XY direction can be changed with respect to the optical axis of the light projecting optical system.

  For example, the correction unit may be configured to correct the inclination of the image plane of the image of the target luminous flux by moving the optical member by controlling the driving unit. In this case, for example, the light projecting optical system may include a moving optical member that can move in the light path of the light projecting optical system, and a drive unit that moves the moving optical member in the light path of the light projecting optical system. Good. For example, a lens, prism, mirror, or the like may be used as the moving optical member. For example, any optical member of a light projecting optical system may be used as the moving optical member. For example, a different member provided separately from the optical member of the light projecting optical system may be used as the moving optical member. For example, by the configuration in which the optical member is moved by controlling the driving means, the examiner arranges the optical member at an appropriate position with respect to the eye to be examined, and accurately corrects the inclination of the image plane of the target luminous flux image be able to.

<Image surface correction based on correction power>
For example, the subjective optometry apparatus according to the present embodiment may include an acquisition unit (for example, the control unit 70) that acquires the correction power of the correction optical system. In this case, for example, the subjective optometry apparatus may be configured to correct the inclination of the image plane of the target luminous flux image based on the correction power of the correction optical system. Accordingly, it is possible to suppress the inclination of the image plane of the target luminous flux image that occurs when the correction power of the correction optical system changes according to the eye refractive power of the eye to be examined. Therefore, the examiner can accurately perform the subjective measurement on the eye to be examined.

  For example, the subjective optometry apparatus includes a correction amount setting unit (for example, the control unit 70) that sets a correction amount for correcting the inclination of the image plane of the image of the target luminous flux based on the correction power of the correction optical system. You may have. In addition, for example, the subjective optometry apparatus includes a correction unit (for example, the control unit 70) that corrects the inclination of the image plane of the image of the target luminous flux based on the correction amount set by the correction amount setting unit. Also good. For example, the correction amount setting means may have a configuration in which a correction amount based on the correction power of the correction optical system is set in advance. In this case, for example, a correction table based on the correction power of the correction optical system is stored in the storage unit (for example, the memory 75), and the correction amount may be set by calling the correction amount from the storage unit. . Further, for example, the correction amount setting means may be configured to perform a calculation process based on the correction power of the correction optical system and calculate the correction amount.

For example, the acquisition unit acquires the correction power of the correction optical system by measuring the eye refractive power of the eye to be examined by the objective measurement optical system (for example, the objective measurement optical system 10) included in the subjective optometry apparatus. It may be a configuration. In addition, for example, the acquisition unit acquires the correction power of the correction optical system by measuring the eye refractive power of the eye to be examined by the subjective measurement optical system (for example, the objective measurement optical system 25) provided in the subjective optometry apparatus. It may be configured to. In this case, for example, the eye refractive power may be an eye refractive power acquired at a timing during subjective measurement. Further, for example, the eye refractive power may be an eye refractive power acquired at a timing different from that during subjective measurement.
For example, the acquisition means acquires the correction power of the correction optical system by receiving the eye refractive power of the eye to be inspected measured by the objective measurement optical system or the subjective measurement optical system different from the subjective optometry apparatus. It may be a configuration. In addition, for example, the acquisition unit may be configured to acquire the correction power of the correction optical system by receiving the eye refractive power of the subject's eye input by operating the operation unit by the examiner.

<Correction of image plane based on misalignment of target luminous flux with respect to eye to be examined>
For example, the subjective optometry apparatus in the present embodiment may include a measurement unit (for example, the measurement unit 7) that houses the light projecting optical system. In addition, for example, the subjective optometry apparatus may include a deviation detection unit (for example, the control unit 70) that detects a positional deviation of the target light flux with respect to the eye to be examined. Further, for example, the subjective optometry apparatus may be configured to correct the inclination of the image plane of the image of the target luminous flux based on the detected positional deviation. Thereby, it is possible to suppress the inclination of the image plane of the image of the target luminous flux caused by the positional deviation of the target luminous flux with respect to the eye to be examined. Therefore, the examiner can accurately perform the subjective measurement on the eye to be examined.

  For example, the correction based on the positional deviation may be a correction using the positional deviation directly, or a correction using the positional information of the measurement unit moved based on the positional deviation (a correction using the positional deviation indirectly). ).

  For example, the deviation detecting means projects alignment light onto the eye to be examined and forms an alignment index around the cornea (for example, a first index projection optical system 45, a second index projection optical system). 46). In this case, for example, the deviation detection unit detects the alignment state based on the alignment index photographed by the anterior ocular segment observation optical system (for example, the observation optical system 50), thereby projecting the eye to be examined and the target luminous flux. It may be configured to detect a relative position with respect to the position (the optical axis of the light projecting optical system). In addition, for example, the shift detection unit detects the pupil position from the front image of the anterior segment imaged by the anterior segment observation optical system, and the detected pupil position and the projected position of the target luminous flux (light of the light projecting optical system). The structure which detects a relative position with respect to an axis | shaft) may be sufficient.

  For example, the subjective optometry apparatus may include correction amount setting means (for example, the control unit 70) that sets a correction amount for correcting the inclination of the image plane of the target luminous flux image based on the positional deviation. Good. In addition, for example, the subjective optometry apparatus includes a correction unit (for example, the control unit 70) that corrects the inclination of the image plane of the image of the target luminous flux based on the correction amount set by the correction amount setting unit. Also good. For example, the correction amount setting means may have a configuration in which a correction amount based on the positional deviation amount is set in advance. In this case, for example, a correction table based on the positional deviation amount may be stored in the storage unit, and the correction amount may be set by calling the correction amount from the storage unit. Further, for example, the correction amount setting means may be configured to perform a calculation process based on the positional deviation amount and calculate the correction amount.

  For example, when performing correction using the position information of the measurement unit moved based on the positional deviation, the subjective optometry apparatus moves the measurement means unit based on the detection result detected by the deviation detection means. May be provided. In addition, for example, the subjective optometry apparatus may include position information acquisition means (for example, the control unit 70) that acquires position information of the measurement unit. Further, for example, the subjective optometry apparatus may be configured to correct the inclination of the image plane of the image of the target luminous flux based on the position information. Thus, it is possible to suppress the inclination of the image plane of the target luminous flux image that occurs when the eye to be examined and the measuring means are aligned. Therefore, the examiner can accurately perform the subjective measurement on the eye to be examined.

  For example, the position information acquisition unit may be configured to acquire the position information of the measurement unit. For example, the configuration for acquiring the position information of the measurement unit may be a configuration for detecting movement of the measurement unit (for example, position information of the measurement unit). In addition, as a structure which detects the positional information on a measurement unit, the structure which detects the position of a measurement unit may be sufficient, and the structure which detects the movement amount of a measurement unit may be sufficient. The position information of the measurement unit may be position information of the entire measurement unit, or may be position information of at least one member of the light projecting optical system housed in the measurement unit. Further, the position information of the measurement unit may be position information of an optical member (for example, the deflection mirror 81) moved together with the measurement unit in the subjective optometry apparatus 1. In this case, the optical member moved together with the measurement unit may be configured to move integrally with the measurement unit.

  Further, for example, the configuration for acquiring the position information of the measurement unit may be a configuration for acquiring the relative position information between the eye to be examined (for example, the corneal vertex position or the pupil position of the eye to be examined) and the measurement unit. For example, the position information acquisition unit is configured to acquire the relative position information by detecting the position of the eye to be examined and the position of the measurement unit when obtaining the relative position information of the eye to be examined and the measurement unit. Also good. Further, for example, the position information acquisition unit may acquire the relative position information by detecting the position of the measurement unit when acquiring the relative position information of the eye to be measured and the measurement unit. In this case, for example, the position of the measurement unit may be stored in advance in the storage unit. Further, for example, the position information acquisition unit may be configured to acquire the relative position information by detecting the movement amount of the measurement unit. In this case, for example, the amount of movement of the measurement unit from a preset initial position may be detected. The position information of the measurement unit may be position information of the entire measurement unit, or may be position information of at least one member of the light projecting optical system housed in the measurement unit.

  For example, as a configuration for acquiring the position information of the measurement unit, the position information of the measurement unit may be acquired by acquiring the relative position information of the optical member and the measurement unit. For example, the position information acquisition unit acquires the relative position information by detecting the position of the optical member and the position of the measurement unit when acquiring the relative position information of the optical member and the measurement unit. May be. Further, for example, when the relative position information of the optical member and the measurement unit is acquired, the position information acquisition unit may be configured to acquire the relative position information by detecting the position of the measurement unit. In this case, for example, the position of the optical member may be stored in advance in the storage unit. Further, for example, the position information acquisition unit may be configured to acquire the relative position information by detecting the movement amount of the measurement unit. In this case, for example, the amount of movement of the measurement unit from a preset initial position may be detected. The position information of the measurement unit may be position information of the entire measurement unit, or may be position information of at least one member of the light projecting optical system housed in the measurement unit.

<Distortion correction for target luminous flux>
For example, the correcting unit may be configured to correct distortion of the target luminous flux caused by the target luminous flux passing through an optical path deviated from the optical axis of the optical member. In other words, the correction unit may be configured to correct distortion of the target luminous flux projected onto the fundus of the eye to be examined. As a result, the optical characteristics of the eye to be examined can be measured subjectively in a state where the distortion of the target luminous flux is reduced. Therefore, the examiner can accurately perform subjective measurement on the eye to be examined.

  For example, the correcting means may correct at least a part of the distortion of the target luminous flux or may correct the entire distortion of the visual luminous flux. For example, the correcting unit may be configured to correct the distortion of the target luminous flux by deforming the target displayed on the display (for example, the display 31). In this case, for example, the projecting optical system may have a display, and the target luminous flux is emitted by displaying the target on the display.

  When performing correction using the display, for example, the correction unit may change the vertical size of the visual target displayed on the display. In addition, for example, the correction unit may change the size in the horizontal direction of the visual target displayed on the display. Further, for example, the correction unit may move the target in the target displayed on the display. In other words, the correction means may be configured to perform at least one of the process of changing the size in the vertical direction on the target displayed on the display, changing the size in the horizontal direction, and moving the target. For example, the examiner can easily correct the distortion of the target luminous flux by deforming the target displayed on the display.

  Further, for example, the correction unit may be configured to correct the distortion of the target luminous flux by moving the optical member by controlling the driving unit. In this case, for example, the light projecting optical system may be configured to include a moving optical member that can move in the light path of the light projecting optical system and a driving unit that moves the moving optical member in the light path of the light projecting optical system. . For example, a lens, prism, mirror, or the like may be used as the moving optical member. Further, for example, as the moving optical member, any optical member of the light projecting optical system may be used, or a different member provided separately from the optical member of the light projecting optical system may be used. For example, the examiner can correct the distortion of the target luminous flux with high accuracy by controlling the driving means to move the optical member.

<Correction of distortion based on correction power>
For example, the subjective optometry apparatus according to the present embodiment may include an acquisition unit (for example, the control unit 70) that acquires the correction power of the correction optical system. In this case, for example, the subjective optometry apparatus may be configured to correct the distortion of the target luminous flux based on the correction power of the correction optical system. Thereby, it is possible to suppress distortion of the image of the target luminous flux caused by a change in the correction power of the correction optical system in accordance with the eye refractive power of the eye to be examined. Therefore, the examiner can accurately perform the subjective measurement on the eye to be examined.

  For example, the subjective optometry apparatus may include correction amount setting means (for example, the control unit 70) that sets a correction amount for correcting distortion of the target luminous flux based on the correction power of the correction optical system. . Further, for example, the subjective optometry apparatus may include a correction unit (for example, the control unit 70) that corrects distortion of the image of the target luminous flux based on the correction amount set by the correction amount setting unit. For example, the correction amount setting means may have a configuration in which a correction amount based on the correction power of the correction optical system is set in advance. In this case, for example, a correction table based on the correction power of the correction optical system is stored in the storage unit (for example, the memory 75), and the correction amount may be set by calling the correction amount from the storage unit. . Further, for example, the correction amount setting means may be configured to perform a calculation process based on the correction power of the correction optical system and calculate the correction amount.

  For example, the acquisition unit acquires the correction power of the correction optical system by measuring the eye refractive power of the eye to be examined by the objective measurement optical system (for example, the objective measurement optical system 10) included in the subjective optometry apparatus. It may be a configuration. In addition, for example, the acquisition unit acquires the correction power of the correction optical system by measuring the eye refractive power of the eye to be examined by the subjective measurement optical system (for example, the objective measurement optical system 25) provided in the subjective optometry apparatus. It may be configured to. In this case, for example, the eye refractive power may be an eye refractive power acquired at a timing during subjective measurement. Further, for example, the eye refractive power may be an eye refractive power acquired at a timing different from that during subjective measurement.

  For example, the acquisition means acquires the correction power of the correction optical system by receiving the eye refractive power of the eye to be inspected measured by the objective measurement optical system or the subjective measurement optical system different from the subjective optometry apparatus. It may be a configuration. In addition, for example, the acquisition unit may be configured to acquire the correction power of the correction optical system by receiving the eye refractive power of the subject's eye input by operating the operation unit by the examiner.

<Correction of distortion based on misalignment of the target luminous flux with respect to the eye to be examined>
For example, the subjective optometry apparatus in the present embodiment may include a measurement unit (for example, the measurement unit 7) that houses the light projecting optical system. In addition, for example, the subjective optometry apparatus may include a deviation detection unit (for example, the control unit 70) that detects a positional deviation of the target light flux with respect to the eye to be examined. For example, the subjective optometry apparatus may be configured to correct distortion of the image of the target luminous flux based on the detected positional deviation. As a result, it is possible to suppress distortion of the image of the target luminous flux caused by the positional deviation of the target luminous flux relative to the eye to be examined. Therefore, the examiner can accurately perform the subjective measurement on the eye to be examined.

  For example, the correction based on the positional deviation may be a correction using the positional deviation directly, or a correction using the positional information of the measurement unit moved based on the positional deviation (a correction using the positional deviation indirectly). ).

  For example, the deviation detecting means projects alignment light onto the eye to be examined and forms an alignment index around the cornea (for example, a first index projection optical system 45, a second index projection optical system). 46). In this case, for example, the deviation detection unit detects the alignment state based on the alignment index photographed by the anterior ocular segment observation optical system (for example, the observation optical system 50), thereby projecting the eye to be examined and the target luminous flux. It may be configured to detect a relative position with respect to the position (the optical axis of the light projecting optical system). In addition, for example, the shift detection unit detects the pupil position from the front image of the anterior segment imaged by the anterior segment observation optical system, and the detected pupil position and the projected position of the target luminous flux (light of the light projecting optical system). The structure which detects a relative position with respect to an axis | shaft) may be sufficient.

  For example, the subjective optometry apparatus may include correction amount setting means (for example, the control unit 70) that sets a correction amount for correcting distortion of the image of the target luminous flux based on the positional deviation. Further, for example, the subjective optometry apparatus may include a correction unit (for example, the control unit 70) that corrects distortion of the image of the target luminous flux based on the correction amount set by the correction amount setting unit. For example, the correction amount setting means may have a configuration in which a correction amount based on the positional deviation amount is set in advance. In this case, for example, a correction table based on the positional deviation amount may be stored in the storage unit, and the correction amount may be set by calling the correction amount from the storage unit. Further, for example, the correction amount setting means may be configured to perform a calculation process based on the positional deviation amount and calculate the correction amount.

  For example, when performing correction using the position information of the measurement unit moved based on the positional deviation, the subjective optometry apparatus moves the measurement means unit based on the detection result detected by the deviation detection means. May be provided. In addition, for example, the subjective optometry apparatus may include position information acquisition means (for example, the control unit 70) that acquires position information of the measurement unit. Further, for example, the subjective optometry apparatus may be configured to correct the distortion of the target luminous flux based on the position information. As a result, it is possible to suppress distortion of the target luminous flux that occurs when the eye to be examined and the measuring means are aligned. Therefore, the examiner can accurately perform the subjective measurement on the eye to be examined.

  For example, the position information acquisition unit may be configured to acquire the position information of the measurement unit. For example, the configuration for acquiring the position information of the measurement unit may be a configuration for detecting movement of the measurement unit (for example, position information of the measurement unit). In addition, as a structure which detects the positional information on a measurement unit, the structure which detects the position of a measurement unit may be sufficient, and the structure which detects the movement amount of a measurement unit may be sufficient. The position information of the measurement unit may be position information of the entire measurement unit, or may be position information of at least one member of the light projecting optical system housed in the measurement unit. Further, the position information of the measurement unit may be position information of an optical member (for example, the deflection mirror 81) moved together with the measurement unit in the subjective optometry apparatus 1. In this case, the optical member moved together with the measurement unit may be configured to move integrally with the measurement unit.

  Further, for example, the configuration for acquiring the position information of the measurement unit may be a configuration for acquiring the relative position information between the eye to be examined (for example, the corneal vertex position or the pupil position of the eye to be examined) and the measurement unit. For example, the position information acquisition unit is configured to acquire the relative position information by detecting the position of the eye to be examined and the position of the measurement unit when obtaining the relative position information of the eye to be examined and the measurement unit. Also good. Further, for example, the position information acquisition unit may acquire the relative position information by detecting the position of the measurement unit when acquiring the relative position information of the eye to be measured and the measurement unit. In this case, for example, the position of the measurement unit may be stored in advance in the storage unit. Further, for example, the position information acquisition unit may be configured to acquire the relative position information by detecting the movement amount of the measurement unit. In this case, for example, the amount of movement of the measurement unit from a preset initial position may be detected. The position information of the measurement unit may be position information of the entire measurement unit, or may be position information of at least one member of the light projecting optical system housed in the measurement unit.

  For example, as a configuration for acquiring the position information of the measurement unit, the position information of the measurement unit may be acquired by acquiring the relative position information of the optical member and the measurement unit. For example, the position information acquisition unit acquires the relative position information by detecting the position of the optical member and the position of the measurement unit when acquiring the relative position information of the optical member and the measurement unit. May be. Further, for example, when the relative position information of the optical member and the measurement unit is acquired, the position information acquisition unit may be configured to acquire the relative position information by detecting the position of the measurement unit. In this case, for example, the position of the optical member may be stored in advance in the storage unit. Further, for example, the position information acquisition unit may be configured to acquire the relative position information by detecting the movement amount of the measurement unit. In this case, for example, the amount of movement of the measurement unit from a preset initial position may be detected. The position information of the measurement unit may be position information of the entire measurement unit, or may be position information of at least one member of the light projecting optical system housed in the measurement unit.

<Example>
Hereinafter, the subjective optometry apparatus in the present embodiment will be described. For example, the subjective optometry apparatus may include a subjective measurement means. Further, for example, the subjective optometry apparatus may include an objective measurement means. In this embodiment, a description will be given by taking as an example a subjective optometry apparatus that includes both a subjective measurement means and an objective measurement means.

  FIG. 1 shows an external view of a subjective optometry apparatus 1 according to the present embodiment. For example, the subjective optometry apparatus 1 includes a housing 2, a presentation window 3, a monitor 4, a chin rest 5, a base 6, an anterior eye imaging optical system 100, and the like. For example, the housing 2 includes measurement means 7 inside (details will be described later). For example, the presentation window 3 is used to present a visual target to the subject. For example, the target luminous flux from the measuring means 7 is projected onto the subject's eye E through the presentation window 3.

  For example, the monitor (display) 4 displays the optical characteristic results (for example, spherical refraction S, cylindrical refraction C, astigmatism axis angle A, prism value Δ, etc.) of the eye E. For example, the monitor 4 is a touch panel. That is, in this embodiment, the monitor 4 functions as an operation unit (controller). For example, a signal corresponding to an operation instruction input from the monitor 4 is output to the control unit 70 described later. The monitor 4 may not be a touch panel type, and may be configured to separately provide the monitor 4 and the operation unit. For example, in this case, a configuration in which at least one of operation means such as a mouse, a joystick, and a keyboard is used as the operation unit.

  For example, the monitor 4 may be a display mounted on the housing 2 or a display connected to the housing 2. For example, in this case, a display using a personal computer may be used. A plurality of displays may be used in combination.

  For example, the distance between the eye E and the subjective optometry apparatus 1 is kept constant by the chin rest 5. In the present embodiment, the configuration in which the chin rest 5 is used to keep the distance between the eye E and the subjective optometry apparatus 1 constant is described as an example, but the present invention is not limited to this. For example, in this embodiment, in order to keep the distance between the eye E to be examined and the subjective optometry apparatus 1 constant, a configuration using a forehead rest or a face rest may be used. For example, the chin rest 5 and the housing 2 are fixed to the base 6.

  For example, the anterior ocular segment imaging optical system 100 includes an imaging element and a lens not shown. For example, the anterior segment imaging optical system 100 is used for imaging the face of the subject.

<Measuring means>
For example, the measurement unit 7 includes a left-eye measurement unit 7L and a right-eye measurement unit 7R. That is, the subjective optometry apparatus 1 in the present embodiment includes a pair of left and right subjective measurement means and a pair of left and right objective measurement means. In the present embodiment, the subjective optometry apparatus 1 is provided with either the left eye measurement means 7L or the right eye measurement means 7R, which moves in the left-right direction, so that the left eye to be examined EL and the right eye It is good also as a structure which projects a target luminous flux on each of the optometry ER. For example, the left eye measuring means 7L and the right eye measuring means 7R in the present embodiment include the same members. Of course, the measurement means 7L for the left eye and the measurement means 7R for the right eye may be configured such that at least some of the members are different.

  FIG. 2 is a diagram for explaining the configuration of the measuring means 7. For example, in the present embodiment, the left eye measuring unit 7L will be described as an example. Note that the right-eye measuring unit 7R has the same configuration as the left-eye measuring unit 7L, and thus the description thereof is omitted. For example, the left eye measuring unit 7L includes a subjective measurement optical system 25, an objective measurement optical system 10, a first index projection optical system 45, a second index projection optical system 46, an observation optical system 50, and the like.

<Aware optical system>
For example, the subjective measurement optical system 25 is used as a part of the configuration of the subjective measurement unit that subjectively measures the optical characteristics of the eye E (details will be described later). For example, the optical characteristics of the eye E include eye refractive power, contrast sensitivity, binocular vision function (for example, oblique amount, stereoscopic vision function, etc.) and the like. In this embodiment, a description will be given by taking as an example a subjective measurement means for measuring the eye refractive power of the eye E. For example, the subjective measurement optical system 25 includes a light projection optical system (target light projection system) 30, a correction optical system 60, and a correction optical system 90.

  For example, the light projecting optical system 30 projects the target luminous flux toward the eye E. For example, the light projecting optical system 30 includes a display 31, a light projecting lens 33, a light projecting lens 34, a reflecting mirror 36, a dichroic mirror 35, a dichroic mirror 29, an objective lens 14, and the like. For example, the target luminous flux projected from the display 31 passes through the optical member in the order of the light projection lens 33, the light projection lens 34, the reflection mirror 36, the dichroic mirror 35, the dichroic mirror 29, and the objective lens 14. Projected on.

  For example, the display 31 includes a drive mechanism 37 (for example, a motor) for rotating (tilting) the display 31 in the vertical direction. For example, the display 31 is rotated around the axis extending in the left-right direction from the center of the display 31 by the drive mechanism 37. The display 31 may rotate around an axis extending in the left-right direction from a position different from the center of the display 31. As a result, the display 31 is tilted up and down with respect to the direction of the optical axis L2. Further, for example, the display 31 is provided with a drive mechanism 38 (for example, a motor or the like) for rotating (panning) the display 31 in the left-right direction. For example, the display 31 is rotated around the axis extending in the vertical direction from the center of the display 31 by the drive mechanism 38. The display 31 may rotate around an axis extending in the vertical direction from a position different from the center of the display 31. As a result, the display 31 is tilted left and right with respect to the direction of the optical axis L2.

  For example, an inspection target such as a Landolt ring target, a fixation target for fixing the eye E to be examined, and the like are displayed on the display 31. For example, the target luminous flux from the display 31 is projected toward the eye E. For example, in the present embodiment, the following description is given by taking the case where an LCD (Liquid Crystal Display) is used as the display 31 as an example. In addition, an organic EL (Electro Luminescence) display, a plasma display, etc. can also be used as a display.

  For example, the correction optical system 60 is disposed in the optical path of the light projecting optical system 30. For example, the correction optical system 60 changes the optical characteristics of the target luminous flux. For example, the correction optical system 60 includes an astigmatism correction optical system 63 and a drive mechanism 39. For example, the astigmatism correcting optical system 63 is disposed between the light projecting lens 33 and the light projecting lens 34. For example, the astigmatism correcting optical system 63 is used to correct the cylindrical power, the cylindrical axis (astigmatic axis), and the like of the eye E. For example, the astigmatism correction optical system 63 includes two positive cylindrical lenses 61a and 61b having the same focal length. The cylindrical lens 61a and the cylindrical lens 61b are independently rotated around the optical axis L2 by driving the rotation mechanisms 62a and 62b, respectively. In the present embodiment, the configuration using two positive cylindrical lenses 61a and 61b as the astigmatism correcting optical system 63 has been described as an example, but the present invention is not limited to this. The astigmatism correction optical system 63 may be configured to correct the cylindrical power, the astigmatism axis, and the like. In this case, for example, a configuration in which the correction lens is taken in and out of the optical path of the light projecting optical system 30 may be used.

  For example, the drive mechanism 39 includes a motor and a slide mechanism. For example, the display 31 is integrally moved in the direction of the optical axis L2 by the drive mechanism 39. For example, at the time of subjective measurement, the display position (presentation distance) of the visual target with respect to the eye E is optically changed by moving the display 31, and the spherical refractive power of the eye E is corrected. That is, the correction optical system having a spherical power is configured by the movement of the display 31. In addition, for example, at the time of objective measurement, the display 31 moves, so that the eye E is clouded. The spherical power correction optical system is not limited to this. For example, the correction optical system having a spherical power may have a configuration in which correction is performed by having a large number of optical elements and arranging the optical elements in the optical path. Further, for example, the correction optical system having a spherical power may be configured to move a lens arranged in the optical path in the optical axis direction.

  In the present embodiment, a description has been given taking as an example a correction optical system that corrects the spherical power, the cylindrical power, and the cylindrical axis, but the present invention is not limited to this. For example, a correction optical system that corrects the prism value may be provided. By providing a prism value correcting optical system, even if the subject is an oblique eye, the target luminous flux can be corrected so as to be projected onto the eye E.

  In this embodiment, an astigmatism correction optical system 63 for correcting the cylindrical power and the cylindrical axis (astigmatism axis) and a correction optical system (for example, the drive means 39) for correcting the spherical power are separately provided. The configuration to be provided has been described as an example, but is not limited thereto. For example, the correction optical system may be configured to include a correction optical system that corrects the spherical power, the cylindrical degree, and the astigmatic axis. That is, the correction optical system in the present embodiment may be an optical system that modulates the wavefront. Further, for example, the correction optical system may be an optical system that corrects spherical power, cylindrical power, astigmatism axis, and the like. In this case, for example, a configuration in which the correction optical system includes a lens disk in which a large number of optical elements (a spherical lens, a cylindrical lens, a dispersion prism, and the like) are arranged on the same circumference. The rotation of the lens disk is controlled by a drive unit (actuator, stepping motor, etc.), and the optical element desired by the examiner (for example, a cylindrical lens, a cross cylinder lens, a rotary prism, etc.) Arranged on the optical axis L2. For example, the switching of the optical elements arranged on the optical axis L2 may be performed by operating the monitor 4 or the like.

  The lens disk is composed of one lens disk or a plurality of lens disks. When a plurality of lens disks are arranged, a driving unit corresponding to each lens disk is provided. For example, as a lens disk group, each lens disk includes an opening (or a 0D lens) and a plurality of optical elements. Typical types of each lens disk are a spherical lens disk having a plurality of spherical lenses having different powers, a cylindrical lens disk having a plurality of cylindrical lenses having different powers, and an auxiliary lens disk having a plurality of types of auxiliary lenses. At least one of a red filter / green filter, a prism, a cross cylinder lens, a polarizing plate, a Madox lens, and an auto cross cylinder lens is disposed on the auxiliary lens disk. Further, the cylindrical lens may be arranged to be rotatable about the optical axis L2 by the driving unit, and the rotary prism and the cross cylinder lens may be arranged to be rotatable about each optical axis by the driving unit.

  For example, the correction optical system 90 is disposed between the objective lens 14 and a deflection mirror 81 described later. For example, the correction optical system 90 is used to correct optical aberrations (for example, astigmatism) that occur in subjective measurement. For example, the correction optical system 90 includes two positive cylindrical lenses 91a and 91b having the same focal length. For example, the correction optical system 90 corrects astigmatism by adjusting the cylindrical power and the astigmatism axis. The cylindrical lens 91a and the cylindrical lens 91b are independently rotated about the optical axis L3 by driving the rotation mechanisms 92a and 92b, respectively. In the present embodiment, the configuration using two positive cylindrical lenses 91a and 91b as the correction optical system 90 has been described as an example. However, the present invention is not limited to this. The correction optical system 90 may be any configuration that can correct astigmatism. In this case, for example, a configuration in which the correction lens is taken in and out of the optical axis L3 may be used.

  In the present embodiment, the configuration in which the correction optical system 90 is arranged separately from the correction optical system 60 has been described as an example, but the present invention is not limited to this. For example, the correction optical system 60 may be configured to also use the correction optical system 90. In this case, the cylindrical power and cylindrical axis (astigmatic axis) of the eye E are corrected according to the astigmatism amount. That is, the correction optical system 60 is driven so as to correct the cylindrical power and the astigmatism axis in consideration (correction) of the astigmatism amount. For example, by using the correction optical system 60 and the correction optical system 90 together, complicated control is not required, so that optical aberration can be corrected with a simple configuration. Further, for example, by using the correction optical system 60 and the correction optical system 90 together, it is not necessary to separately provide a correction optical system for optical aberration, so that optical aberration can be corrected with a simple configuration.

<Objective optical system>
For example, the objective measurement optical system 10 is used as a part of the configuration of the objective measurement means that objectively measures the optical characteristics of the eye to be examined (details will be described later). For example, the optical characteristics of the eye E include eye refractive power, axial length, corneal shape, and the like. In this embodiment, an objective measurement unit that measures the eye refractive power of the eye E will be described as an example. For example, the objective measurement optical system 10 includes a projection optical system 10a, a light receiving optical system 10b, and a correction optical system 90.

  For example, the projection optical system (projection optical system) 10 a projects a spot-like measurement index onto the fundus of the eye E through the pupil center of the eye E. For example, the light receiving optical system 10b takes out the fundus reflection light reflected from the fundus in a ring shape through the periphery of the pupil, and causes the two-dimensional imaging element 22 to capture a ring-shaped fundus reflection image.

  For example, the projection optical system 10a includes a measurement light source 11, a relay lens 12, a hall mirror 13, a prism 15, a driving unit (motor) 23, a dichroic mirror 35, which are arranged on the optical axis L1 of the objective measurement optical system 10. A dichroic mirror 29 and the objective lens 14 are included. For example, the prism 15 is a light beam deflecting member. For example, the drive unit 23 drives the prism 15 to rotate about the optical axis L1. For example, the light source 11 has a conjugate relationship with the fundus of the eye E. Further, the hole portion of the hall mirror 13 has a conjugate relationship with the pupil of the eye E to be examined. For example, the prism 15 is disposed at a position deviating from a position conjugate with the pupil of the eye E to be examined, and decenters the light beam passing therethrough with respect to the optical axis L1. Instead of the prism 15, a configuration in which a plane-parallel plate is disposed obliquely on the optical axis L1 as a light beam deflecting member may be employed.

  For example, the dichroic mirror 35 shares the optical path of the subjective measurement optical system 25 with the optical path of the objective measurement optical system 10. That is, for example, the dichroic mirror 35 makes the optical axis L2 of the subjective measurement optical system 25 and the optical axis L1 of the objective measurement optical system 10 coaxial. For example, the dichroic mirror 29, which is an optical path branching member, reflects the light beam by the subjective measurement optical system 25 and the measurement light by the projection optical system 10a and guides them to the eye E to be examined.

  For example, the light receiving optical system 10 b shares the objective lens 14, the dichroic mirror 29, the dichroic mirror 35, the prism 15, and the hall mirror 13 of the projection optical system 10 a, and the relay lens 16 disposed on the optical path in the reflection direction of the hall mirror 13. , A mirror 17, a light receiving aperture 18 disposed in the optical path in the reflection direction of the mirror 17, a collimator lens 19, a ring lens 20, and a two-dimensional imaging element 22 such as a CCD. For example, the light receiving aperture 18 and the two-dimensional image sensor 22 are in a conjugate relationship with the fundus of the eye E to be examined. For example, the ring lens 20 includes a lens part formed in a ring shape and a light shielding part in which a region other than the lens part is coated with a light shielding coating, and is optically conjugate with the pupil of the eye E to be examined. It has become a relationship. For example, the output from the two-dimensional image sensor 22 is input to the control unit 70.

  For example, the dichroic mirror 29 reflects the reflected light of the measurement light from the projection optical system 10 a guided to the fundus of the eye E toward the light receiving optical system 10. For example, the dichroic mirror 29 transmits the anterior ocular segment observation light and the alignment light and guides them to the observation optical system 50. For example, the dichroic mirror 35 reflects the reflected light of the measurement light from the projection optical system 10 a guided to the fundus of the eye E toward the light receiving optical system 10.

  The objective measurement optical system 10 is not limited to the one described above, and a ring-shaped measurement index is projected from the periphery of the pupil to the fundus to extract the fundus reflection light from the center of the pupil, and the two-dimensional image sensor 22 has a ring shape. Well-known ones such as a configuration for receiving the fundus reflection image of the eye can be used.

  Note that the objective measurement optical system 10 is not limited to the above, and a projection optical system that projects measurement light toward the fundus of the eye E and reflected light acquired by reflection of the measurement light on the fundus. Any measuring optical system having a light receiving optical system that receives light by the light receiving element may be used. For example, the optical power measurement optical system may be configured to include a Shack-Hartmann sensor. Of course, an apparatus provided with another measurement method may be used (for example, a phase difference method device that projects a slit).

  For example, the light source 11 of the projection optical system 10a, the light receiving diaphragm 18, the collimator lens 19, the ring lens 20, and the two-dimensional imaging element 22 of the light receiving optical system 10b can be moved integrally in the optical axis direction. In the present embodiment, for example, the light source 11 of the projection optical system 10 a, the light receiving aperture 18, the collimator lens 19, the ring lens 20, and the two-dimensional imaging element 22 of the light receiving optical system 10 b are driven by a drive mechanism 39 that drives the display 31. It is moved integrally in the direction of the optical axis L1. That is, the display 31, the light source 11 of the projection optical system 10a, the light receiving diaphragm 18 of the light receiving optical system 10b, the collimator lens 19, the ring lens 20, and the two-dimensional image pickup device 22 are synchronized as the drive unit 95 and move integrally. Of course, it is also possible to separately drive each of them.

  For example, the drive unit 95 moves a part of the objective measurement optical system 10 in the optical axis direction so that the outer ring light beam is incident on the two-dimensional image sensor 22 in each meridian direction. That is, by moving a part of the objective measurement optical system 10 in the direction of the optical axis L1 in accordance with the spherical refraction error (spherical refractive power) of the eye E, the spherical refraction error is corrected and the fundus of the eye E is examined. In contrast, the light source 11, the light receiving diaphragm 18, and the two-dimensional imaging device 22 are optically conjugate. For example, the movement position of the drive mechanism 39 is detected by a potentiometer (not shown). The Hall mirror 13 and the ring lens 20 are arranged so as to be conjugate with the pupil of the eye E to be examined at a constant magnification regardless of the amount of movement of the drive unit 95.

  In the above configuration, the measurement light beam emitted from the light source 11 is spot-shaped on the fundus of the eye E through the relay lens 12, the hall mirror 13, the prism 15, the dichroic mirror 35, the dichroic mirror 29, and the objective lens 14. A point light source image is formed. At this time, the pupil projection image (projected light beam on the pupil) of the hall portion in the hall mirror 13 is eccentrically rotated at high speed by the prism 15 rotating around the optical axis. The point light source image projected onto the fundus is reflected / scattered and emitted from the eye E to be examined, collected by the objective lens 14, the dichroic mirror 29, the dichroic mirror 35, the prism 15 rotating at high speed, the hall mirror 13, and the relay lens. 16, the light is condensed again at the position of the light receiving aperture 18 via the mirror 17, and a ring-shaped image is formed on the two-dimensional image sensor 22 by the collimator lens 19 and the ring lens 20.

  For example, the prism 15 is disposed in the common optical path of the projection optical system 10a and the light receiving optical system 10b. For example, since the reflected light beam from the fundus passes through the same prism 15 as the projection optical system 10a, reverse scanning is performed in the subsequent optical systems as if there was no eccentricity of the projected light beam / reflected light beam (received light beam) on the pupil. Is done.

  For example, the correction optical system 90 is also used as the subjective measurement optical system 25. Needless to say, a correction optical system used in the objective measurement optical system 10 may be provided separately.

<First index projection optical system and second index projection optical system>
For example, in the present embodiment, the first index projection optical system 45 and the second index projection optical system 46 are disposed between the correction optical system 90 and the deflection mirror 81. Of course, the arrangement positions of the first index projection optical system 45 and the second index projection optical system 46 are not limited to this. For example, the first index projection optical system 45 and the second index projection optical system 46 may be provided on the cover of the housing 2. For example, in this case, a configuration in which the first index projection optical system 45 and the second index projection optical system 46 are arranged around the presentation window 3 can be mentioned.

  For example, in the first index projection optical system 45, a plurality of infrared light sources are arranged at 45 degree intervals on a concentric circle with the optical axis L3 as the center, and are arranged symmetrically with respect to a vertical plane passing through the optical axis L3. ing. For example, the first index projection optical system 45 emits near-infrared light for projecting the alignment index onto the cornea of the eye E to be examined. For example, the second index projection optical system 46 includes six infrared light sources arranged at different positions from the first index projection optical system 45. In this case, the first index projection optical system 45 projects an infinite index on the cornea of the eye E from the left and right directions, and the second index projection optical system 46 projects a finite index on the cornea of the eye E in the vertical direction. Alternatively, the projection is performed from an oblique direction. For convenience, FIG. 2 shows only a part of the first index projection optical system 45 and the second index projection optical system 46. The second index projection optical system 46 is also used as anterior ocular segment illumination that illuminates the anterior segment of the eye E to be examined. The second index projection optical system 46 can also be used as an index for corneal shape measurement. The first index projection optical system 45 and the second index projection optical system 46 are not limited to point light sources. For example, a ring light source or a line light source may be used.

<Observation optics>
For example, the observation optical system (imaging optical system) 50 shares the objective lens 14 and the dichroic mirror 29 in the subjective measurement optical system 25 and the objective measurement optical system 10, and includes an imaging lens 51 and a two-dimensional imaging element 52. . For example, the imaging element 52 has an imaging surface disposed at a position substantially conjugate with the anterior eye portion of the eye E. For example, the output from the image sensor 52 is input to the control unit 70. As a result, the anterior segment image of the eye E is captured by the two-dimensional image sensor 52 and displayed on the monitor 4. The observation optical system 50 also serves as an optical system for detecting an alignment index image formed on the cornea of the eye E by the first index projection optical system 45 and the second index projection optical system 46, and is controlled by the control unit 70. The position of the alignment index image is detected.

<Internal configuration of the subjective optometry device>
Hereinafter, the internal configuration of the subjective optometry apparatus 1 will be described. FIG. 3 is a schematic configuration diagram of the inside of the subjective optometry apparatus 1 according to the present embodiment as viewed from the front direction (direction A in FIG. 1). FIG. 4 is a schematic configuration diagram of the inside of the subjective optometry apparatus 1 according to the present embodiment as viewed from the side surface direction (direction B in FIG. 1). FIG. 5 is a schematic configuration diagram of the inside of the subjective optometry apparatus 1 according to the present embodiment as viewed from the top surface direction (C direction in FIG. 1). 4 and 5, only the optical axis of the left-eye measuring means 7L is shown for convenience of explanation.

  For example, the subjective optometry apparatus 1 includes a subjective measurement unit and an objective measurement unit. For example, in the subjective measurement means and the objective measurement means, the target luminous flux from the measurement means 7 passes through the optical path deviated from the optical axis L of the optical member (for example, a concave mirror 85 described later), and the eye E to be examined. Is guided to. For example, the optical axis L in the present embodiment is an axis that goes to the center of the sphere of the concave mirror 85. That is, in this embodiment, the target light beam is irradiated from an oblique direction with respect to the optical axis L of the concave mirror 85, and the reflected light beam is guided to the eye E to be examined.

  For example, the subjective measuring means includes measuring means 7, deflecting mirror 81, driving means 82, driving means 83, reflecting mirror 84, and concave mirror 85. Note that the subjective measurement means is not limited to this configuration. For example, the structure which does not have the reflective mirror 84 may be sufficient. In this case, the target luminous flux from the measuring means 7 may be irradiated from an oblique direction with respect to the optical axis L of the concave mirror 85 after passing through the polarizing mirror 81. For example, the structure which has a half mirror may be sufficient. In this case, the target luminous flux from the measuring means 7 may be irradiated obliquely with respect to the optical axis L of the concave mirror 85 via the half mirror, and the reflected luminous flux may be guided to the eye E to be examined. . In this embodiment, the concave mirror 85 is arranged, but a configuration in which a convex lens is arranged instead of the concave mirror 85 may be used.

  For example, the objective measurement unit includes the measurement unit 7, the deflection mirror 81, the reflection mirror 84, and the concave mirror 85. Note that the objective measurement means is not limited to this configuration. For example, the structure which does not have the reflective mirror 84 may be sufficient. In this case, the target luminous flux from the measuring means 7 may be irradiated from an oblique direction with respect to the optical axis L of the concave mirror 85 after passing through the polarizing mirror 81. For example, the structure which has a half mirror may be sufficient. In this case, the target luminous flux from the measuring means 7 may be irradiated obliquely with respect to the optical axis L of the concave mirror 85 via the half mirror, and the reflected luminous flux may be guided to the eye E to be examined. . In this embodiment, the concave mirror 85 is arranged, but a configuration in which a convex lens is arranged instead of the concave mirror 85 may be used.

  For example, the subjective optometry apparatus 1 includes a left-eye drive unit 9L and a right-eye drive unit 9R, and can move the left-eye measurement unit 7L and the right-eye measurement unit 7R in the X direction. . For example, the distance between the deflecting mirror 81 and the measuring means 7 is changed by moving the left eye measuring means 7L and the right eye measuring means 7R, and the target light flux presentation position in the Z direction is changed. The As a result, the target luminous flux corrected by the correction optical system 60 is guided to the eye E, and measurement is performed so that an image of the target luminous flux corrected by the correction optical system 60 is formed on the fundus of the eye E. The means 7 can be adjusted in the Z direction.

  For example, the deflection mirror 81 includes a right-eye deflection mirror 81R and a left-eye deflection mirror 81L provided in a pair of left and right. For example, the deflection mirror 81 is disposed between the correction optical system 60 and the eye E. That is, the correction optical system 60 in this embodiment has a left-eye correction optical system and a right-eye correction optical system provided in a pair of left and right, and the left-eye deflection mirror 81L is a left-eye correction optical system. The right-eye deflection mirror 81R is disposed between the optical system and the left eye ER, and the right-eye deflection mirror 81R is disposed between the right-eye correction optical system and the right eye ER. For example, the deflection mirror 81 is preferably arranged at the conjugate position of the pupil.

  For example, the left-eye deflection mirror 81L reflects the light beam projected from the left-eye measuring means 7L and guides it to the left eye EL. Further, for example, the left-eye deflection mirror 81L reflects the reflected light reflected by the left eye EL and guides it to the left-eye measuring means 7L. For example, the right-eye deflection mirror 81R reflects the light beam projected from the right-eye measuring means 7R and guides it to the right eye ER. For example, the right-eye deflection mirror 81R reflects the reflected light reflected by the right eye ER and guides it to the right-eye measuring means 7R. In the present embodiment, a configuration in which the deflection mirror 81 is used as a deflection member that reflects the light beam projected from the measuring means 7 and guides it to the eye E is described as an example. However, the present invention is not limited thereto. Not. The deflecting member may be any deflecting member that reflects the light beam projected from the measuring means 7 and guides it to the eye E. For example, the deflection member may be a prism or a lens.

  For example, the drive means 82 is composed of a motor (drive unit) or the like. For example, the drive unit 82 includes a drive unit 82L for driving the left-eye deflection mirror 81L and a drive unit 82R for driving the right-eye deflection mirror 81R. For example, the deflection mirror 81 rotates by the driving of the driving unit 82. For example, the drive unit 82 rotates the deflection mirror 81 with respect to the rotation axis in the horizontal direction (X direction) and the rotation axis in the vertical direction (Y direction). That is, the driving unit 82 rotates the deflection mirror 81 in the XY directions. The rotation of the deflection mirror 81 may be one of the horizontal direction and the vertical direction.

  For example, the drive means 83 is composed of a motor (drive unit) or the like. For example, the drive unit 83 includes a drive unit 83L for driving the left-eye deflection mirror 81L and a drive unit 83R for driving the right-eye deflection mirror 81R. For example, when the driving unit 83 is driven, the deflection mirror 81 moves in the X direction. For example, the distance between the left-eye deflection mirror 81L and the right-eye deflection mirror 81R is changed by moving the left-eye deflection mirror 81L and the right-eye deflection mirror 81R. The distance in the X direction between the optical path for the left eye and the optical path for the right eye can be changed according to the distance between the pupils of E.

  For example, a plurality of deflection mirrors 81 may be provided in each of the left-eye optical path and the right-eye optical path. For example, a configuration in which two deflection mirrors are provided in each of the left-eye optical path and the right-eye optical path (for example, two deflection mirrors in the left-eye optical path) can be given. In this case, one deflection mirror may be rotated in the X direction and the other deflection mirror may be rotated in the Y direction. For example, when the deflection mirror 81 is rotated, an apparent light beam for deflecting an apparent light beam for forming an image of the correction optical system 60 in front of the eye of the subject eye can be optically corrected. it can.

  For example, the concave mirror 85 is shared by the right eye measuring means 7R and the left eye measuring means 7L. For example, the concave mirror 85 is shared by the right-eye optical path including the right-eye correction optical system and the left-eye optical path including the left-eye correction optical system. That is, the concave mirror 85 is disposed at a position that passes through both the right-eye optical path including the right-eye correction optical system and the left-eye optical path including the left-eye correction optical system. Of course, the concave mirror 85 may not be configured to be shared by the right-eye optical path and the left-eye optical path. That is, the configuration may be such that a concave mirror is provided for each of the right-eye optical path including the right-eye correction optical system and the left-eye optical path including the left-eye correction optical system. For example, the concave mirror 85 guides the target light flux that has passed through the correction optical system to the eye E, and forms an image of the target light flux that has passed through the correction optical system in front of the eye of the eye E. In this embodiment, the configuration using the concave mirror 85 has been described as an example. However, the present invention is not limited to this, and various optical members can be used. For example, as the optical member, a lens, a plane mirror, or the like can be used.

  For example, the concave mirror 85 is used both as a subjective measurement means and an objective measurement means. For example, the target luminous flux projected from the subjective measurement optical system 25 is projected onto the eye E through the concave mirror 85. For example, the measurement light projected from the objective measurement optical system 10 is projected onto the eye E through the concave mirror 85. For example, the reflected light of the measurement light projected from the objective measurement optical system 10 is guided to the light receiving optical system 10 b of the objective measurement optical system 10 through the concave mirror 85. In this embodiment, a configuration in which the reflected light of the measurement light from the objective measurement optical system 10 is guided to the light receiving optical system 10b of the objective measurement optical system 10 through the concave mirror 85 is taken as an example. However, it is not limited to this. For example, the reflected light of the measurement light by the objective measurement optical system 10 may be configured not via the concave mirror 85.

  More specifically, for example, in this embodiment, the optical axis between the concave mirror 85 and the eye E in the subjective measurement means and the distance between the concave mirror 85 and the eye E in the objective measurement means. The optical axis is at least coaxial. For example, in this embodiment, the optical axis L2 of the subjective measurement optical system 25 and the optical axis L1 of the objective measurement optical system 10 are combined by the dichroic mirror 35 and are coaxial.

<Optical path of awareness measurement means>
Hereinafter, the optical path of the awareness measuring means will be described. For example, the subjective measurement means reflects the target luminous flux that has passed through the correction optical system 60 in the direction of the subject's eye by the concave mirror 85, thereby guiding the target luminous flux to the eye E to be examined and passed through the correction optical system 60. An image of the target luminous flux is formed in front of the eye E so as to optically have a predetermined inspection distance. For example, at this time, the target luminous flux that has passed through the correction optical system 60 passes through the optical path deviated from the optical axis L of the concave mirror 85 and enters the concave mirror 85, and the optical path deviated from the optical axis L of the concave mirror 85. And is guided to the eye E to be examined. For example, the visual target image viewed from the subject appears to be farther than the actual distance from the subject eye E to the display 31. That is, by using the concave mirror 85, the target distance to the subject eye E is extended, and the target image is presented to the subject so that the target luminous flux image can be seen at a predetermined inspection distance position. Can do.

  This will be described in more detail. In the following description, the left-eye optical path is described as an example, but the right-eye optical path has the same configuration as the left-eye optical path. For example, in the subjective measurement unit for the left eye, the target luminous flux projected from the display 31 of the measurement unit 7L for the left eye enters the astigmatism correction optical system 63 via the projection lens 33. The target luminous flux that has passed through the astigmatism correction optical system 63 is incident on the correction optical system 90 via the reflection mirror 36, the dichroic mirror 35, the dichroic mirror 29, and the objective lens 14. The target luminous flux that has passed through the correction optical system 90 is guided from the left-eye measuring means 7L toward the left-eye deflection mirror 81L. The target luminous flux emitted from the left-eye measuring means 7L and reflected by the left-eye deflection mirror 81 is reflected by the reflection mirror 84 toward the concave mirror 85. For example, the target luminous flux emitted from the display 31 reaches the left eye EL by passing through the optical member in this way.

  As a result, a visual target image corrected by the correction optical system 60 is formed on the fundus of the left eye to be examined EL with reference to the spectacle wearing position of the left eye to be examined EL (for example, about 12 mm from the corneal apex position). Therefore, the astigmatism correcting optical system 63 is disposed in front of the eyes, and the spherical power is adjusted in front of the eyes by the spherical power correcting optical system (in this embodiment, driven by the drive mechanism 39). Are equivalent, and the subject can collimate the image of the optotype in a natural state via the concave mirror 85. In the present embodiment, the optical path for the right eye has the same configuration as the optical path for the left eye, and the eyeglass wearing positions of both eyes ER and EL (for example, about 12 mm from the corneal apex position) are used as a reference. A target image corrected by the pair of right and left correction optical systems 60 is formed on the fundus of both eyes. In this way, the subject responds to the examiner while directly looking at the target in the natural vision state, and corrects by the correction optical system 60 until the inspection target looks appropriate, and based on the correction value. The optical characteristics of the eye to be examined are measured subjectively.

<Optical path of objective measurement means>
Next, the optical path of the objective measurement means will be described. In the following description, the left-eye optical path is described as an example, but the right-eye optical path has the same configuration as the left-eye optical path. For example, in the objective measurement means for the left eye, the measurement light emitted from the light source 11 of the projection optical system 10 a in the objective measurement optical system 10 is corrected by the correction optical system 90 via the relay lens 12 to the objective lens 14. Is incident on. The measurement light that has passed through the correction optical system 90 is projected from the left-eye measuring means 7L toward the left-eye deflection mirror 81L. The measurement light emitted from the left-eye measuring means 7L and reflected by the left-eye deflection mirror 81 is reflected by the reflection mirror 84 toward the concave mirror 85. The measurement light reflected by the concave mirror passes through the reflection mirror 84 and reaches the left eye EL, and forms a spot-like point light source image on the fundus of the left eye EL. At this time, the pupil projection image (projected light beam on the pupil) of the hall portion of the hall mirror 13 is eccentrically rotated at high speed by the prism 15 rotating around the optical axis.

  The light of the point light source image formed on the fundus of the left eye to be examined EL is reflected and scattered, exits the eye to be examined E, is condensed by the objective lens 14 through the optical path through which the measurement light has passed, and is dichroic mirrored. 29, through the dichroic mirror 35, the prism 15, the hall mirror 13, the relay lens 16, and the mirror 17. The reflected light up to the mirror 17 is condensed again on the aperture of the light receiving aperture 18, is made into a substantially parallel light beam (in the case of a normal eye) by the collimator lens 19, and is taken out as a ring light beam by the ring lens 20, The two-dimensional image sensor 22 receives the light as a ring image. By analyzing the received ring image, the optical characteristics of the eye E can be objectively measured.

<Control unit>
FIG. 6 is a diagram illustrating a control system of the subjective optometry apparatus 1 according to the present embodiment. For example, the control unit 70 includes various members such as the monitor 4, the non-volatile memory 75 (hereinafter, memory 75), the measurement light source 11 provided in the measurement unit 7, the two-dimensional image sensor 22, the display 31, and the two-dimensional image sensor 52. Electrically connected. Further, for example, the control unit 70 is electrically connected to a drive unit (not shown) provided in the drive unit 9, the drive mechanism 39, the rotation mechanisms 62a and 62b, the drive unit 83, and the rotation mechanisms 92a and 92b.

  For example, the control unit 70 includes a CPU (processor), a RAM, a ROM, and the like. For example, the CPU controls each member in the subjective optometry apparatus 1. For example, the RAM temporarily stores various information. For example, the ROM stores various programs for controlling the operation of the subjective optometry apparatus 1, target data for various examinations, initial values, and the like. The control unit 70 may be configured by a plurality of control units (that is, a plurality of processors).

  For example, the memory 75 is a non-transitory storage medium that can retain stored contents even when power supply is interrupted. For example, as the memory 75, a hard disk drive, a flash ROM, a USB memory that is detachably attached to the subjective optometry apparatus 1, and the like can be used. For example, the memory 75 stores a control program for controlling the subjective measurement means and the objective measurement means.

<Control action>
The operation of the subjective optometry apparatus 1 having the above configuration will be described. For example, in this embodiment, before starting the subjective measurement, the objective measurement for the eye E is performed using the objective measurement optical system having the above-described configuration. In this case, for example, the control unit 70 acquires objectively measured refractive power such as the spherical refractive index S, the cylindrical refractive index C, the astigmatic axis angle A, the prism value Δ, and the like of the eye E. That is, the control unit 70 acquires the objective eye refractive power (objective value) of the eye E. For example, the control unit 70 stores the objective value in the memory 75.

  For example, when subjective measurement is started, the correction optical system 60 is controlled based on the acquired objective eye refractive power (objective value) of the eye E to be examined. For example, the control unit 70 illuminates the display 31 based on at least one of the spherical refraction S, the cylindrical refraction C, the astigmatic axis angle A, the prism value Δ, etc. of the eye E measured objectively. The eye is moved in the direction of the axis L2, and the eye refractive power of the eye E is corrected.

  For example, the arrangement position of the display 31 provided in the light projecting optical system 30 varies depending on the eye refractive power of the eye E to be examined. For example, the display 31 is disposed at a standby position where an uncorrected target luminous flux (that is, a 0D target luminous flux) is projected onto the eye E. For example, for the eye E having an eye refractive power of 0D, the standby position of the display 31 is set as the initial position of the display 31. For example, for the eye E whose eye refractive power is not 0D, the display 31 moves so as to correct the eye refractive power of the eye E to 0D, and the display 31 has a position different from the standby position of the display 31. The initial position is set. For example, this allows the control unit 70 to acquire the correction power of the correction optical system 60. That is, the control unit 70 can acquire the correction power for correcting the eye E to be 0D eye refractive power from the arrangement position of the display 31.

  For example, when starting subjective measurement, the control unit 70 displays a required visual acuity value target (for example, a visual target having a visual acuity value of 1.0) on the display 31. For example, when a visual acuity target is presented to the eye E, the examiner performs distance vision measurement for the eye E. For example, the visual acuity target displayed on the display 31 can be switched by selecting a predetermined switch on the monitor 4. For example, when the subject's answer is a correct answer, the examiner switches to a one-step higher visual acuity target. On the other hand, when the subject's answer is an incorrect answer, the visual acuity target is lowered by one step. That is, the control unit 70 switches the target to be displayed on the display 31 based on the signal for changing the visual acuity target from the monitor 4. In the present embodiment, distance vision measurement is described as an example, but the present invention is not limited to this. For example, the near vision measurement can be performed in the same manner as the distance vision measurement.

  For example, the eye refractive power of the eye E is corrected as described above, and the examiner presents the subject with the chin placed on the chin rest 5 while the required visual acuity index is displayed on the display 31. Observe the window 3 and instruct to fixate the visual target. For example, when the anterior eye portion of the eye E is detected by the anterior eye imaging optical system 100, the control unit 70 starts alignment between the eye E and the measuring unit 7. That is, the control unit 70 starts automatic alignment.

  FIG. 7 is a view showing an anterior segment image of the eye E to be examined. For example, when detecting the alignment state, the light sources included in the first index projection optical system 45 and the second index projection optical system 46 are turned on. As a result, the index images Ma to Mh are projected on the eye E in a ring shape. For example, the control unit 70 detects the XY center coordinates (cross marks shown in FIG. 7) in the index images Ma to Mh as the approximate corneal apex position K. For example, the index images Ma and Me are at infinity, and the index images Mh and Mf are at finite distance.

  For example, the alignment state of the eye E in the left-right direction (X direction) and the up-down direction (Y direction) is determined using a preset alignment reference position O1 (see FIG. 8). For example, in this embodiment, such an alignment reference position O1 includes the corneal apex position of the eye E to be examined, the optical axis L4L or L4R of the target luminous flux reflected by the concave mirror 85 and directed to the eye E, Is set to the position where they match. Further, for example, a predetermined area centered on the alignment reference position O1 is set as an alignment allowable range A1 (see FIG. 8) for determining whether alignment is appropriate.

  FIG. 8 is a diagram for explaining the alignment control. For example, the control unit 70 obtains a deviation amount Δd between the detected substantially corneal apex position K of the eye E and the alignment reference position O1, thereby shifting the positional deviation of the target light flux with respect to the eye E in the XY direction. To detect. For example, when the positional deviation of the target luminous flux with respect to the eye E is detected, the control unit 70 moves the measuring unit 7 based on the detection result. For example, in this embodiment, the deflection mirror 81 and the measuring means 7 are moved integrally in the X direction, so that the eye E can be aligned in the X direction (left and right direction). Further, for example, in this embodiment, alignment of the eye E to be examined in the Y direction (vertical direction) can be performed by integrally moving the polarizing mirror 81 and the measuring unit 7 in the Z direction. Note that the deflecting mirror 81 and the measuring means 7 may not be integrated and may be configured to move separately. For example, the control unit 70 adjusts the alignment in the X direction and the Y direction so that the deviation amount Δd falls within the alignment allowable range A1.

  For example, when the measuring unit 7 moves as described above with respect to the eye E and alignment is completed, the subjective measurement for the eye E is started.

<Correction of image plane of image with target luminous flux>
For example, in this embodiment, as shown in FIGS. 2 to 5, the target luminous flux emitted from the display 31 is an optical axis L2, an optical axis L3, and an optical axis L4 (optical axis L4L or optical axis L4R). Are sequentially guided to the eye E to be examined. At this time, the target luminous flux emitted from the display 31 passes through an optical path off the optical axis L of the concave mirror 85 and is guided to the eye E to be examined. In this embodiment, the optical characteristic of the eye E is measured by using the target light beam guided to the eye E or the image of the target light beam guided to the eye E. Is done. For example, as in the case of the subjective optometry apparatus 1 in the present embodiment, when the target luminous flux passes through the optical path deviated from the optical axis L of the optical member (in this embodiment, the concave mirror 85), the eye fundus to be examined The image plane I (see FIG. 9) of the image of the target luminous flux projected onto the image plane I is not substantially perpendicular to the optical axis, and the image plane I is inclined. In other words, when the target luminous flux passes through the optical path deviating from the optical axis L of the optical member, the imaging plane when the visual luminous flux forms an image on the fundus OF of the eye E (see FIG. 9) is inclined.

  FIG. 9 is a diagram for explaining the inclination of the image plane I of the image of the target luminous flux. In FIG. 9, for convenience of explanation, only the left eye to be examined EL, the concave mirror 85, and the display 31 are shown, and the other members are not shown. Further, the dotted line portion in FIG. 9 is an enlarged view of a part of the left eye to be examined EL. For example, a target luminous flux is emitted from the display 31 in various directions. For example, in this embodiment, the target luminous flux irradiated from the center of the display 31 is illustrated as the target luminous flux from the center area of the display 31. For example, the condensing position CA in FIG. 9 is a condensing position of the target luminous flux irradiated from the center of the display 31. Further, for example, in this embodiment, the target luminous fluxes irradiated from both ends in the vertical direction of the display 31 are illustrated as the target luminous fluxes from the peripheral area in the display 31. For example, a condensing position PA1 in FIG. 9 is a condensing position of the target luminous flux irradiated from the upper end of the display 31. Further, for example, the condensing position PA2 in FIG. 9 is a condensing position of the target luminous flux irradiated from the lower end of the display 31.

  For example, the image plane I of the image of the target luminous flux is inclined with respect to the optical axis direction of the target. For example, FIG. 9 shows an example in which the image plane I of the image of the target luminous flux is inclined in the vertical direction (Y direction) with respect to the optical axis L4L. In addition, although description is abbreviate | omitted in a present Example, the image surface I of the image of a target light beam may incline in the left-right direction (X direction) with respect to an optical axis direction. For example, as shown in FIG. 9, the condensing position CA in the center region of the target luminous flux and the condensing positions PA1 and PA2 in the peripheral region of the target luminous flux are shifted from the fundus OF of the left eye EL. Then, the image plane I of the image of the target luminous flux guided to the left eye EL is tilted. For this reason, for example, in the case of an optical system that focuses on the center of the target, a target that is in focus in the central region but not in the peripheral region is presented to the left eye EL. . In other words, the peripheral area of the visual target appears blurred on the left eye to be examined EL.

  Therefore, for example, the control unit 70 corrects the inclination of the image plane I of the image of the target luminous flux caused by the target luminous flux passing through the optical path deviated from the optical axis of the optical member. For example, in this embodiment, the inclination of the image plane I of the image of the target light beam is corrected so that the imaging performance of the target light beam (for example, a spot diagram, MTF (Modulated Transfer Function), etc.) is optimal. The For example, the inclination of the image plane I of the image of the target luminous flux can be corrected by changing the angle of the surface of the display 31 with respect to the optical axis. In other words, the inclination of the image plane I of the image of the target luminous flux can be corrected by inclining the display 31 (the surface of the display 31) with respect to the optical axis.

  FIG. 10 is a diagram illustrating the image plane I of the image of the target luminous flux due to the inclination of the display 31. For example, in the state where the display 31 is not tilted, the condensing position CA in the central region of the target light flux and the condensing positions PA1 and PA2 in the peripheral region are shifted in the fundus OF of the left eye EL, and the target light flux Is inclined with respect to the optical axis L4L (see FIG. 9). Therefore, for example, the control unit 70 in the present embodiment rotates the display 31 in the vertical direction (the direction of the arrow c in FIG. 10) with respect to the optical axis L4L in order to correct the inclination of the image plane I. For example, the control unit 70 in the present embodiment rotates the display 31 in the left-right direction (the direction of the arrow d in FIG. 10) with respect to the optical axis L4L in order to correct the inclination of the image plane I. For example, the control unit 70 rotates the display 31 in this way, so that the condensing position CA in the central area and the condensing positions PA1 and PA2 in the peripheral area in the target luminous flux are substantially perpendicular to the optical axis L4L. Thus, the inclination of the image plane I of the image of the target luminous flux is corrected. That is, the imaging plane when the target luminous flux forms an image on the fundus OF of the left eye EL is corrected substantially vertically. For this reason, the left eye to be examined EL is presented with a target focused on the central region and the peripheral region of the target luminous flux.

  Although not described in the present embodiment, the image plane I of the image of the target luminous flux is inclined in the vertical direction (Y direction) and the horizontal direction (X direction) with respect to the optical axis L4R even in the right eye ER. . For example, in this case, similar to the left eye EL, the inclination of the image plane I of the image of the target luminous flux can be corrected by changing the angle of the surface of the display 31 with respect to the optical axis L4R. .

  For example, the inclination of the image plane I of the image of the target luminous flux varies depending on the position at which the visual luminous flux irradiated from the display 31 enters the concave mirror 85. For example, the position at which the target luminous flux is incident on the concave mirror varies depending on a change in the correction power for correcting the eye refractive power of the eye E to be examined. In other words, when the subjective measurement is started, the display 31 moves in accordance with the eye refractive power of the eye E, so that the position at which the target luminous flux enters the concave mirror 85 changes. Further, for example, the position at which the target luminous flux enters the concave mirror 85 differs depending on the alignment state between the eye E and the measuring means 7. That is, when the subjective measurement is started, the measurement means 7 moves with respect to the eye E to be aligned, so that the position at which the target luminous flux enters the concave mirror 85 changes. Of course, the inclination of the image plane I of the image of the target luminous flux occurs as long as the target luminous flux irradiated from the display 31 changes the position when entering the concave mirror 85. For this reason, it is preferable to correct the inclination of the image plane I when the position of the target luminous flux irradiated from the display 31 is incident on the concave mirror 85.

  Hereinafter, a case where the image plane I of the image of the target luminous flux is inclined due to a change in the correction power and a case where the image plane I of the image of the visual target luminous flux is inclined according to the alignment state will be described in order.

<Image surface correction based on correction power>
For example, when the image plane I of the image of the target luminous flux is tilted by a change in the correction power, the control unit 70 determines the image of the target light flux projected on the fundus of the eye based on the correction power of the correction optical system 60. The inclination of the image plane I is corrected. At this time, for example, the control unit 70 sets a correction amount for correcting the inclination of the image plane I of the image of the target luminous flux based on the correction power of the correction optical system 60. That is, the control unit 70 sets a correction amount for correcting the inclination of the image plane I of the image of the target luminous flux based on the position of the display 31 moved according to the eye refractive power of the eye E.

  For example, the memory 75 provided in the control unit 70 stores a correction table for converting the correction power of the correction optical system 60 into a correction amount for correcting the inclination of the image plane I of the image of the target luminous flux. Yes. For example, such a correction table may be set in advance for each correction power by performing experiments and simulations. For example, the control unit 70 sets a correction amount corresponding to the correction power of the correction optical system 60 based on the correction table. In the present embodiment, the configuration in which the correction amount is set for each correction power of the correction optical system 60 in order to correct the inclination of the image plane I of the image of the target luminous flux has been described as an example. It is not limited. For example, the correction power of the correction optical system 60 may be divided by predetermined steps (for example, 5D steps such as 0D to 5D, 5D to 10D, etc.), and the correction amount may be set for each step. .

  Further, the control unit 70 corrects the inclination of the image plane I of the image of the target luminous flux based on the set correction amount. For example, in this embodiment, the control unit 70 changes the angle of the surface of the display 31 with respect to the optical axis in the vertical and horizontal directions as described above, and the target luminous flux tilted according to the correction power of the correction optical system 60. The inclination of the image plane I of the image is corrected. As a result, the image plane I of the image of the target luminous flux becomes substantially perpendicular to the optical axis L4 (the optical axis L4L or the optical axis L4R), and the eye E is in both the central region and the peripheral region of the target luminous flux. A focused target is presented.

<Correction of image plane by alignment state>
For example, when the image plane I of the image of the target luminous flux is tilted due to the movement of the measuring means 7 (that is, when the image plane I of the image of the target luminous flux is tilted depending on the alignment state), the control unit 70 performs the measurement. Based on the position information of the means 7, the inclination of the image plane I of the image of the target luminous flux projected on the fundus of the eye to be examined is corrected. At this time, for example, the control unit 70 acquires position information of the measuring unit 7. For example, as the position information of the measuring unit 7, the movement amount of the measuring unit 7 may be acquired, or the position coordinates of the measuring unit 7 may be acquired. Further, for example, as the position information of the measuring unit 7, the relative position information between the concave mirror 85 and the measuring unit 7 may be acquired, or the relative position information between the eye E and the measuring unit 7 may be acquired. Good. For example, in this case, the control unit 70 acquires the relative positional relationship between the concave mirror 85 or the eye E to be examined and the measuring unit 7. For example, such relative position information may be acquired by the control unit 70 detecting the position of the concave mirror 85 or the eye E and the position of the measuring unit 7, respectively.

For example, the position information of the measuring means 7 may be configured to use position information that has changed as a result of the adjustment of the overall position of the measuring means 7. Further, for example, the positional information of the measuring unit 7 uses positional information that is changed by adjusting the position of at least one member (for example, a lens or a display) in the light projecting optical system 30 provided in the measuring unit 7. It may be configured.
In the above description, the configuration for acquiring the position information of the measuring unit 7 has been described as an example, but the configuration for acquiring the position information of the deflection mirror 81 may be used. For example, in this embodiment, since the polarizing mirror 81 and the measuring means 7 are moved integrally, the alignment with respect to the eye E is performed, so indirectly using the movement amount and position coordinates of the deflection mirror 81. You may acquire the positional information on the measurement means 7. FIG.

  For example, the control unit 70 sets a correction amount for correcting the inclination of the image plane I of the image of the target luminous flux based on the acquired position information of the measuring unit 7. For example, the memory 75 provided in the control unit 70 stores a correction table for converting the position information of the measuring unit 7 into a correction amount for correcting the inclination of the image plane I of the image of the target luminous flux. . For example, such a correction table may be set in advance by performing experiments or simulations. For example, the control unit 70 sets a correction amount corresponding to the position information of the measuring unit 7 based on the correction table.

  For example, the control unit 70 corrects the inclination of the image plane I of the image of the target luminous flux based on the set correction amount. For example, in this embodiment, the control unit 70 changes the angle of the surface of the display 31 with respect to the optical axis in the vertical and horizontal directions as described above, and the inclination of the image plane of the image of the target luminous flux tilted according to the alignment state. I is corrected. As a result, the image plane I of the image of the target luminous flux becomes substantially perpendicular to the optical axis L4 (the optical axis L4L or the optical axis L4R), and the eye E is in both the central region and the peripheral region of the target luminous flux. A focused target is presented.

  In this embodiment, when the image plane I of the image of the target luminous flux is tilted by the correction power of the correction optical system 60 and when it is tilted by the alignment state between the eye E and the measuring means 7 Although the example corrected in each was demonstrated, it is not limited to this. Of course, in the subjective optometry apparatus 1 according to the present embodiment, the image plane I of the target luminous flux is determined in consideration of both the correction power of the correction optical system 60 and the alignment state between the eye E and the measuring means 7. It is good also as composition which corrects.

<Correction of distortion in target luminous flux>
For example, when the target luminous flux passes through an optical path deviated from the optical axis of the optical member (in this embodiment, the concave mirror 85), distortion occurs in the target luminous flux projected onto the eye fundus of the eye to be examined. Therefore, in the following, correction of distortion in the target luminous flux projected on the fundus of the eye to be examined will be described.

  FIG. 11 is a diagram for explaining distortion of the target luminous flux. In the present embodiment, for convenience of explanation, it is assumed that a basic shape grid BF having the same vertical size and horizontal size is displayed on the display 31 as a visual target and guided to the eye E to be examined. To do. For example, when the target luminous flux is distorted, it appears that the deformed grid TF indicated by the solid line is projected onto the eye E even if the basic shape grid BF indicated by the dotted line is displayed on the display 31. That is, it appears that the grid in which the size in the vertical direction and the size in the horizontal direction are deformed due to distortion of the target luminous flux is projected onto the eye E to be examined. In addition, the eye E appears to be projected with a grid moved in the rotational direction about the center S of the target. For example, in FIG. 11, the deformed grid TF is smaller in the vertical direction than the grid BF in the basic shape, larger in the horizontal direction, and rotated counterclockwise about the center S of the target. It appears to be displayed on the display 31. The grid (target) projected on the eye E is not necessarily deformed in all of the vertical direction, the horizontal direction, and the rotation direction, but the target luminous flux emitted from the display 31 is incident on the concave mirror 85. At least one of them is deformed depending on the position to be operated.

  Therefore, for example, the control unit 70 corrects distortion of the target luminous flux caused by the target luminous flux passing through the optical path deviated from the optical axis of the optical member. In other words, for example, the control unit 70 corrects distortion of the target luminous flux projected onto the fundus of the eye to be examined. For example, in the present embodiment, the distortion of the target luminous flux projected on the fundus of the eye to be examined can be corrected by deforming the target displayed on the display 31. More specifically, the target is deformed by performing at least one of a change in the vertical size of the target displayed on the display 31, a change in the horizontal size, and a movement of the target. Thus, distortion of the target luminous flux can be corrected.

  FIG. 12 is a diagram for explaining correction of distortion in the target luminous flux. In FIG. 12, the grid (target) displayed on the display 31 is indicated by a dotted line, and the grid (target) projected on the eye E is indicated by a solid line. For example, as described with reference to FIG. 11, even if the basic shape grid BF is displayed on the display 31, the target luminous flux is distorted, so that the deformed shape grid TF is projected onto the eye E to be examined. Therefore, for example, the control unit 70 displays a target for canceling such distortion of the target luminous flux on the display 31. For example, in this embodiment, the control unit 70 has a larger size in the vertical direction than the basic shape grid BF, a smaller size in the horizontal direction, and a rotation that is rotated clockwise around the center S of the target. The grid RF is displayed on the display 31 in advance. As a result, the distortion of the target luminous flux guided toward the eye E can be corrected. That is, the correction grid RF displayed on the display 31 is distorted in the target luminous flux, but the basic shape grid BF is projected onto the eye E to be examined.

  Although not described in the present embodiment, a correction grid RF that takes into account not only distortion that deforms in the vertical direction, horizontal direction, and rotation direction of the target but also distortion that deforms in a pincushion or barrel shape is displayed. 31 may be displayed.

  For example, as described above, the position at which the target luminous flux irradiated from the display 31 enters the concave mirror 85 differs depending on the correction power for correcting the eye refractive power of the eye E. Further, as described above, the position at which the target luminous flux irradiated from the display 31 is incident on the concave mirror 85 differs depending on the alignment state between the eye E and the measuring means 7. Hereinafter, the case where the target luminous flux is distorted by the change in the correction power and the case where the visual luminous flux is distorted by the alignment state will be described in order.

<Correction of distortion based on correction power>
For example, when the target luminous flux is distorted due to a change in the correction power, the control unit 70 corrects the distortion of the visual luminous flux projected on the fundus of the eye based on the correction power of the correction optical system 60. At this time, for example, the control unit 70 sets a correction amount for correcting distortion of the target luminous flux based on the correction power of the correction optical system 60. That is, the control unit 70 sets a correction amount for correcting the distortion of the target luminous flux based on the position of the display 31 moved according to the eye refractive power of the eye E.

  For example, the memory 75 provided in the control unit 70 stores a correction table for converting the correction power of the correction optical system 60 into a correction amount for correcting distortion of the target luminous flux. For example, such a correction table may be set in advance by performing experiments or simulations. For example, the control unit 70 sets a correction amount corresponding to the correction power of the correction optical system 60 based on the correction table.

  Further, the control unit 70 corrects the distortion of the target luminous flux based on the set correction amount. For example, in the present embodiment, as described above, the control unit 70 performs a process of changing at least one of the vertical size of the target, the horizontal size, and the movement of the target. The distortion of the target luminous flux is corrected. As a result, the correction grid RF for canceling the distortion of the target luminous flux that changes depending on the correction power of the correction optical system 60 is displayed on the display 31, and the basic shape grid BF is projected onto the eye E to be examined.

<Correction correction by alignment state>
For example, when the target luminous flux is distorted depending on the alignment state (that is, the target luminous flux is distorted due to the movement of the measuring unit 7 with respect to the eye E), the control unit 70 is based on the position information of the measuring unit 7. Then, the distortion of the target luminous flux projected on the fundus of the eye to be examined is corrected. For example, the alignment state is determined using the above-described index images Ma to Mh (see FIG. 7), and the position of the measuring unit 7 with respect to the eye E is adjusted. For example, the control unit 70 acquires the position information of the measurement unit 7 at this time. The position information of the measuring means 7 may be the amount of movement or position coordinates of the measuring means 7 as in the case of correcting the image plane I of the image of the target luminous flux, or the eye E and the measuring means 7. Relative position information may be used. Further, the position information of the measuring means 7 may be acquired indirectly by obtaining the position information of the deflection mirror 81.

  For example, when the position information of the measuring unit 7 is acquired, the control unit 70 sets a correction amount for correcting the distortion of the target luminous flux based on the position information. For example, the memory 75 provided in the control unit 70 stores a correction table for converting the position information of the measuring unit 7 into a correction amount for correcting distortion of the target luminous flux. For example, such a correction table may be set in advance by performing experiments or simulations. For example, the control unit 70 sets a correction amount corresponding to the position information of the measuring unit 7 based on the correction table.

  For example, the control unit 70 corrects the distortion of the target luminous flux based on the set correction amount. For example, in the present embodiment, as described above, the control unit 70 performs a process of changing at least one of the vertical size of the target, the horizontal size, and the movement of the target. The distortion of the target luminous flux is corrected. As a result, the correction grid RF for canceling the distortion of the target luminous flux that changes depending on the alignment state is displayed on the display 31, and the basic shape grid BF is projected onto the eye E to be examined.

  In this embodiment, an example of correcting the distortion of the target luminous flux generated in each of the change in the correction power of the correction optical system 60 and the change in the alignment state between the eye E and the measuring means 7 is taken as an example. However, the present invention is not limited to this. Of course, the subjective optometry apparatus 1 according to the present embodiment corrects distortion of the target luminous flux in consideration of both the correction power of the correction optical system 60 and the alignment state between the eye E and the measuring means 7. Also good.

  As described above, for example, the subjective optometry apparatus according to the present embodiment corrects the inclination of the image plane of the image of the target luminous flux caused by the target luminous flux passing through the optical path deviated from the optical axis of the optical member. Correction means are provided. As a result, the optical characteristics of the eye to be examined can be measured subjectively in a state where the inclination of the image plane of the image of the target luminous flux is reduced. Therefore, the examiner can accurately perform subjective measurement on the eye to be examined.

  Further, for example, the subjective optometry apparatus according to the present embodiment includes a correcting unit that corrects distortion of the target luminous flux caused by the target luminous flux passing through the optical path deviated from the optical axis of the optical member. As a result, the optical characteristics of the eye to be examined can be measured subjectively in a state where the distortion of the target luminous flux is reduced. Therefore, the examiner can accurately perform subjective measurement on the eye to be examined.

  Further, for example, the subjective optometry apparatus in the present embodiment corrects the inclination of the image plane of the image of the target luminous flux based on the correction power of the correction optical system. Accordingly, it is possible to suppress the inclination of the image plane of the target luminous flux image that occurs when the correction power of the correction optical system changes according to the eye refractive power of the eye to be examined. Therefore, the examiner can accurately perform the subjective measurement on the eye to be examined.

  In addition, for example, the subjective optometry apparatus in the present embodiment corrects distortion of the target luminous flux based on the correction power of the correction optical system. Thereby, distortion of the target luminous flux caused by changing the correction power of the correction optical system according to the eye refractive power of the eye to be examined can be suppressed. Therefore, the examiner can accurately perform the subjective measurement on the eye to be examined.

  In addition, for example, the subjective optometry apparatus according to the present embodiment includes a shift detection unit that detects a shift in the position of the target light beam, a moving unit that moves the measurement unit based on the detection result of the shift detection unit, and the position of the measurement unit. Position information acquisition means for acquiring information. Thus, it is possible to suppress the inclination of the image plane of the target luminous flux image that occurs when the eye to be examined and the measuring means are aligned. In addition, this makes it possible to suppress distortion of the target luminous flux that occurs when the eye to be examined and the measuring means are aligned. Therefore, the examiner can accurately perform the subjective measurement on the eye to be examined.

In addition, for example, the subjective optometry apparatus in the present embodiment changes the angle of the display surface with respect to the optical axis based on the set correction amount. Thus, the examiner can easily correct the inclination of the image plane of the target luminous flux image.
Further, for example, the subjective optometry apparatus in the present embodiment deforms the visual target displayed on the display based on the set correction amount. Thus, the examiner can easily correct the distortion of the target luminous flux.

  Further, for example, the subjective optometry apparatus in the present embodiment guides the target luminous flux or the image of the target luminous flux optically to the eye to be examined so as to have a predetermined examination distance by using an optical member. Can do. For this reason, an extra member or space for guiding the image of the target luminous flux so as to be an actual distance to the eye to be examined is not required, and the apparatus can be miniaturized.

<Transformation example>
It should be noted that the size of the target displayed on the display 31 seems to be slightly different between the case where the eye E is viewing the display 31 from the front direction and the case where the eye E is viewing the display 31 from an oblique direction. There is a case. That is, the visual target when the eye E is viewing the display 31 from an oblique direction may appear vertically and horizontally compared to the visual target when the eye E is viewing the display 31 from the front direction. For example, in the present embodiment, the display 31 is arranged perpendicular to the optical axis so that the eye E can see the display 31 from the front direction. However, for example, when correcting the inclination of the image plane I of the image in the target luminous flux, the eye E to be examined is displayed on the display 31 in order to change the angle of the surface of the display 31 with respect to the optical axis. May be seen from an oblique direction, and the size of the target may appear to change.

  For this reason, for example, the control unit 70 may be configured to correct the change in the size of the target as described above by adjusting the size of the target displayed on the display 31. For example, in this case, the control unit 70 may acquire a correction amount for correcting a change in the size of the target based on the angle at which the display 31 is tilted. For example, the control unit 70 may adjust the size of the target displayed on the display 31 based on the acquired correction amount. As a result, even if the display 31 is tilted to correct the tilt of the image plane I of the image in the target luminous flux, a target having the same size as that when the display 31 is viewed from the front direction is presented to the eye E. it can.

  In the present embodiment, the configuration in which the control unit 70 acquires the correction amount corresponding to the correction power of the correction optical system 60 using the correction table has been described as an example, but the present invention is not limited to this. For example, the control unit 70 may be configured to acquire a correction amount corresponding to the correction power of the correction optical system 60 from an arithmetic expression. In this case, for example, an arithmetic expression for performing the arithmetic processing is set in advance by performing an experiment or a simulation, and is stored in the memory 75 provided in the control unit 70. For example, the control unit 70 may be configured to obtain a correction amount corresponding to the correction power using an arithmetic expression and perform arithmetic processing for correcting the image plane I of the image of the target luminous flux. Further, for example, the control unit 70 may be configured to obtain a correction amount corresponding to the correction power using an arithmetic expression and perform arithmetic processing for correcting distortion of the target luminous flux.

  Similarly, in the present embodiment, the configuration in which the control unit 70 acquires the correction amount corresponding to the position information of the measuring unit 7 using the correction table has been described as an example. However, the control unit 70 corresponds to the position information of the measuring unit 7. The corrected amount may be obtained from an arithmetic expression. In this case, for example, the control unit 70 may perform arithmetic processing for correcting the image plane I of the image of the target luminous flux using an arithmetic expression. Further, for example, the control unit 70 may perform a calculation process for correcting distortion of the target light beam using an arithmetic expression.

  In this embodiment, the configuration in which the inclination of the image plane I of the target light flux is corrected based on the correction power of the correction optical system 60 or in accordance with the alignment state of the eye E is taken as an example. Although described, it is not limited to this. For example, in this embodiment, the inclination of the image plane I of the image in the target luminous flux may be corrected based on the interpupillary distance of the eye E. For example, the interpupillary distance of the eye E is measured at the time of objective measurement and stored in the memory 75 provided in the control unit 70.

  For example, at the start of subjective measurement, the control unit 70 calls and sets the interpupillary distance of the eye E from the memory 75. The interpupillary distance of the eye E may be set by the examiner inputting the interpupillary distance to the monitor 4 or may be configured to receive and set the interpupillary distance acquired by another device. Alternatively, a predetermined interpupillary distance (for example, an average human interpupillary distance) may be automatically set.

  For example, the control unit 70 integrally moves the deflection mirror 81 and the measuring unit 7 in the X direction and rotates the deflection mirror 81 in accordance with the set interpupillary distance of the eye E to be examined. For example, this causes the left-eye deflection mirror 81L and the right-eye deflection mirror 81R to move, and changes the distance between the left-eye deflection mirror 81L and the right-eye deflection mirror 81R. Accordingly, the distance in the X direction between the optical path for the left eye and the optical path for the right eye can be changed according to the interpupillary distance of the eye E.

  For example, as described above, since the measuring unit 7 also moves depending on the interpupillary distance of the eye E, the position at which the target luminous flux enters the concave mirror 85 changes, and the image plane I of the image of the target luminous flux is inclined. . Therefore, for example, the control unit 70 performs the positional information of the measuring unit 7 (for example, the movement amount and position coordinates of the measuring unit 7, the eye E and the measuring unit 7, as in the correction of the image plane I by the alignment state). The display 31 may be tilted to correct the tilt of the image plane I of the image of the target luminous flux based on the relative position information or the like.

  In the above description, the inclination of the image plane I of the image of the target luminous flux is corrected based on the interpupillary distance of the eye E. However, when the measuring means 7 moves according to the interpupillary distance of the eye E, The position where the target luminous flux enters the concave mirror 85 changes, and the target luminous flux is distorted. For this reason, for example, the control unit 70 performs the vertical size, the horizontal size, and the movement of the target based on the position information of the measuring unit 7 in the same manner as the correction of the distortion due to the alignment state. Further, a process of changing at least one of the above may be performed to correct distortion of the target luminous flux.

  Further, in the present embodiment, a configuration in which the inclination of the image plane I of the target light flux is corrected based on the correction power of the correction optical system 60 or according to the alignment state of the eye E to be taken as an example. Although described, it is not limited to this. For example, in this embodiment, the inclination of the image plane I of the image in the target luminous flux may be corrected based on the amount of convergence of the light projecting optical system 30.

  For example, in the present embodiment, the inclination of the image plane I of the image in the target luminous flux may be corrected based on the convergence angle. For example, the control unit 70 may change the convergence angle by the deflection mirror 81 by controlling the light projecting optical system 30. That is, the control unit 70 may change the convergence amount (convergence angle) of the light projecting optical system 30 by rotating the deflection mirror 81.

  For example, when the amount of convergence is changed, the polarizing mirror 81 rotates as described above, so that the position at which the target luminous flux enters the concave mirror 85 changes, and the image plane I of the image of the target luminous flux tilts. . Therefore, for example, the control unit 70 may correct the inclination of the image plane I of the image in the target luminous flux based on the amount of convergence of the light projecting optical system 30. For example, in this embodiment, the control unit 70 uses both the rotation amount of the deflection mirror 81 (for example, the rotation angle, position information, position coordinates, etc.) and the position information of the measuring means 7 to use the target. A correction amount for correcting the inclination of the image plane I of the image of the light beam is set. For example, the control unit 70 acquires and sets a correction amount according to the rotation amount of the deflection mirror 81 and the position information of the measuring unit 7 from the memory 75. For example, the memory 75 may store a correction table for acquiring such a correction amount, or may store an arithmetic expression. Thereby, the rotation amount of the deflection mirror 81 and the position information of the measuring means 7 are converted into the correction amount. For example, the control unit 70 corrects the inclination of the image plane I of the image of the target luminous flux based on the set correction amount. For example, in the present embodiment, as described above, the control unit 70 can correct the inclination I of the image plane of the image of the target luminous flux by changing the angle of the surface of the display 31 based on the correction amount. it can.

  In the above description, the inclination of the image plane I of the image of the target luminous flux is corrected based on the amount of convergence of the light projecting optical system 30, but when the polarizing mirror 81 rotates with the change in the amount of convergence, The position where the target luminous flux enters the concave mirror 85 changes, and the target luminous flux is distorted. For this reason, for example, the control unit 70 may set a correction amount for correcting distortion of the target luminous flux by using both the rotation amount of the deflection mirror 81 and the position information of the measuring unit 7. . For example, a correction table and an arithmetic expression for acquiring such a correction amount may be stored in the memory 75, and the rotation amount of the deflection mirror 81 and the position information of the measuring unit 7 may be converted into the correction amount. For example, the control unit 70 performs a process of changing at least one of the vertical size, the horizontal size, and the movement of the target based on the set correction amount, and the target luminous flux. Can be corrected.

  In this embodiment, the alignment state of the measuring unit 7 in the left-right direction (X direction) and the up-down direction (Y direction) of the eye E is described. However, the measuring unit 7 in the front-rear direction (Z direction) of the eye E is described. The alignment state may be considered. For example, in a state where the measuring means 7 is aligned in the Z direction of the eye E, the image interval a from the infinite index image Ma to Me and the image from the finite index image Mh to Mf shown in FIG. The interval b is set to have a certain ratio. For example, in the state where the measuring means 7 is not aligned in the Z direction of the eye E, the image interval from the index image Ma to Me at infinity hardly changes, but the images from the index images Mh to Mf at finite distance. The interval changes. For example, the control unit 70 compares the image ratio (that is, a / b) between the image interval a between the index images Ma and Me at infinity and the image interval b between the index images Mh and Mf at finite distance. Thus, it is possible to detect the positional deviation in the Z direction of the target luminous flux with respect to the eye E. For details of the above configuration, refer to JP-A-6-46999.

  For example, the control unit 70 detects a positional deviation of the target light flux with respect to the eye E in the X direction, the Y direction, and the Z direction, and moves the measuring unit 7 based on the detected position deviation, thereby detecting the eye E and the measuring unit 7. You may make it perform alignment of these. For example, in this embodiment, alignment of the eye E in the Z direction (front-rear direction) can be performed by integrally moving the polarizing mirror 81 and the measuring unit 7 in the direction of the optical axis L4.

  For example, when the measuring means 7 moves in the X direction, the Y direction, and the Z direction, the position of the target light beam incident on the concave mirror 85 changes, so that the image of the target light beam guided to the eye E to be examined is changed. An inclination occurs in the image plane I. Therefore, for example, the control unit 70 may be configured to correct the image plane I of the image of the target luminous flux using position information of the measuring unit 7 with respect to the eye E in the X direction, the Y direction, and the Z direction. Good. Similarly, for example, when the measuring unit 7 moves in the X direction, the Y direction, and the Z direction, the position of the target luminous flux incident on the concave mirror 85 changes, so the target luminous flux guided to the eye E to be examined is changed. Distortion occurs. For this reason, for example, the control unit 70 may be configured to correct the distortion of the target luminous flux by using the position information of the measuring unit 7 with respect to the eye E in the X direction, the Y direction, and the Z direction.

  In the present embodiment, the configuration in which the alignment in the X direction, the Y direction, and the Z direction is adjusted by driving the deflection mirror 81 and the measuring unit 7 integrally is described as an example. However, the present invention is not limited thereto. Not. For example, in this embodiment, any configuration may be used as long as the positional relationship between the eye E to be examined and the subjective measurement means and the objective measurement means can be adjusted by driving the deflection mirror 81 and the measurement means 7. That is, any configuration may be used as long as the X direction, the Y direction, and the Z direction can be adjusted so that the target luminous flux from the light projecting optical system 30 is formed on the fundus of the eye E. For example, in this case, a configuration in which the subjective optometry apparatus 1 can be moved in the XYZ directions with respect to the chin rest 5 and the subjective optometry apparatus 1 may be moved is also possible. Further, for example, a configuration in which the deflection mirror 81 is fixedly arranged and only the measuring unit 7 moves may be employed. Further, for example, the X direction, the Y direction, and the Z direction may be adjusted only by the deflection mirror 81. In this case, for example, a configuration in which the deflection mirror 81 rotates and moves in the Z direction to change the distance between the deflection mirror 81 and the measuring means 7 can be mentioned.

  In the present embodiment, the configuration in which the eye refractive power of the eye E is acquired by the objective measurement optical system provided in the subjective optometry apparatus 1 is described as an example, but the present invention is not limited to this. For example, the eye refractive power of the eye E to be examined may be acquired by a subjective measurement optical system provided in the subjective optometry apparatus 1. In this case, the correction power of the correction optical system 60 can be acquired using the objective eye refractive power (objective value) as described in the present embodiment, and the subjective eye refractive power acquired in the subjective measurement. It can also be obtained using (awareness value). For example, the awareness value acquired during the awareness measurement may be stored in the memory 75 as needed, and the control unit 70 may call the awareness value in accordance with the alignment state between the eye E and the measuring means 7.

  In the present embodiment, the configuration in which the eye refractive power of the eye E is acquired by the objective measurement optical system included in the subjective optometry apparatus 1 is described as an example, but the present invention is not limited thereto. For example, as the eye refractive power of the eye E, the objective value or the subjective value of the eye E acquired by another device may be used. For example, in this case, a configuration in which the subjective optometry apparatus 1 is provided with a reception function for receiving eye refractive power from another apparatus can be mentioned. For example, in this case, the examiner may input the eye refractive power of the eye E to be examined.

  In addition, although the present Example demonstrated and demonstrated the structure which implements position alignment with the to-be-tested eye E and the measurement means 7 before the start of subjective measurement, it is not limited to this. For example, the alignment between the eye E and the measuring unit 7 may be performed even during subjective measurement. For example, in this case, even after the positioning of the measuring unit 7 with respect to the eye E is completed, the control unit 70 detects the misalignment between the eye E and the measuring unit 7 at any time, and the XYZ of the eye E is detected. Tracking control (tracking) that always detects movement in the direction may be performed. For example, in the case of the subjective optometry apparatus 1 having such a configuration, the control unit 70 always corrects the inclination of the image plane I of the image of the target luminous flux projected onto the subject eye as the subject eye E moves. be able to. In the case of the subjective optometry apparatus 1 having such a configuration, the control unit 70 can always correct the distortion of the target luminous flux projected onto the eye to be examined as the eye E moves.

  In the present embodiment, the configuration in which the inclination of the image plane I of the image of the target luminous flux is corrected by changing the angle of the surface of the display 31 with respect to the optical axis has been described as an example. It is not limited. For example, in this embodiment, the inclination of the image plane I of the image of the target luminous flux may be corrected by moving the optical member based on the set correction amount. For example, in this case, an optical member provided in the light projecting optical system 30 may be used, or an optical member may be provided separately.

  For example, when the inclination of the image plane I of the image of the target luminous flux is corrected using the optical member provided in the light projecting optical system 30, the optical member is projected based on the correction amount set by the control unit 70. The optical system 30 may be inclined in the optical axis direction. For example, in this embodiment, the light projecting lens 33, the light projecting lens 34, the objective lens 14 and the like can be tilted as optical members. In addition, the structure which inclines either of these light projection lenses and objective lenses may be sufficient, and the structure which inclines in combination may be sufficient.

  For example, when the inclination of the image plane I of the image of the target light flux is corrected by providing an optical member separately, the optical member is placed in the optical axis of the light projecting optical system 30 based on the set correction amount. It may be inserted and removed. For example, the optical member may be inserted / removed anywhere as long as it is on the optical axis through which the target luminous flux guided from the display 31 to the eye E is passed. In other words, the optical member may be inserted / removed anywhere on the optical axis L2 and on the optical axis L3. For example, as such an optical member, a lens (convex lens, concave lens), prism, mirror, or the like can be used.

 Thus, for example, the subjective optometry apparatus according to the present embodiment includes a movable optical member that can move in the optical path of the light projecting optical system, and a driving unit that moves the movable optical member in the optical path of the light projecting optical system. In addition, for example, the subjective optometry apparatus in the present embodiment can move the moving optical member based on the correction amount. Therefore, the examiner can accurately correct the inclination of the image plane of the target luminous flux image by arranging the optical member at an appropriate position with respect to the eye to be examined.

  In the present embodiment, the configuration in which the target displayed on the display 31 is deformed in advance to correct the distortion of the target luminous flux has been described as an example, but the present invention is not limited to this. For example, in this embodiment, similarly to the case of correcting the inclination of the image plane I of the image of the target luminous flux, the distortion of the target luminous flux is corrected by moving the optical member based on the set correction amount. May be. For example, also in this case, an optical member provided in the light projecting optical system 30 may be used, or an optical member may be provided separately.

  For example, when correcting the distortion of the target luminous flux using an optical member provided in the light projecting optical system 30, any one of the light projecting lens 33, the light projecting lens 34, the objective lens 14 and the like is inclined. Alternatively, it may be configured to be inclined by combining a plurality. For example, when correcting the distortion of the target luminous flux by separately providing an optical member, a lens (convex lens, concave lens), prism, mirror, or the like is inserted / removed on the optical axis through which the luminous flux passes. It is good. For example, the distortion of the target luminous flux may be corrected by the control unit 70 tilting or inserting / removing the optical member based on the correction amount set in this way.

  Thus, for example, the subjective optometry apparatus according to the present embodiment includes a movable optical member that can move in the optical path of the light projecting optical system, and a driving unit that moves the movable optical member in the optical path of the light projecting optical system. In addition, for example, the subjective optometry apparatus in the present embodiment can move the moving optical member based on the correction amount. For this reason, the examiner can arrange the optical member at an appropriate position with respect to the eye to be examined, and can accurately correct the distortion of the target luminous flux.

  In this embodiment, based on the correction power of the correction optical system 60, the target luminous flux is generated by passing through an optical path off the optical axis L of the optical member (in this embodiment, the concave mirror 85). Although the configuration for correcting the distortion has been described as an example, the configuration is not limited thereto. For example, when the target luminous flux passes through an optical path deviating from the optical axis L of the optical member, various aberrations such as astigmatism, spherical aberration, coma aberration, chromatic aberration, and distortion aberration occur. For example, the control unit 70 in the present embodiment may be configured to correct the aberration as described above based on the correction power of the correction optical system 60.

DESCRIPTION OF SYMBOLS 1 Subjective optometry apparatus 2 Housing 4 Monitor 5 Jaw stand 7 Measuring means 10 Objective measurement optical system 25 Subjective measurement optical system 30 Projection optical system 45 First index projection optical system 46 Second index projection optical system 50 Observation optics System 60 Correction optical system 70 Control unit 75 Memory 81 Deflection mirror 84 Reflection mirror 85 Concave mirror 90 Correction optical system 100 Anterior eye imaging optical system

Claims (9)

A projection optical system that projects the target luminous flux toward the eye to be examined; and
A correction optical system that is disposed in the optical path of the light projecting optical system and changes the optical characteristics of the target luminous flux;
An optical member for guiding the target luminous flux corrected by the correction optical system to the eye to be examined;
With
The target luminous flux passes through an optical path off the optical axis of the optical member and is guided to the eye to be examined, and the optical characteristics of the eye to be examined are subjectively determined using the target luminous flux guided to the eye to be examined. A subjective optometry device for measuring
Correction means for correcting distortion of the target luminous flux caused by the optical luminous flux passing through an optical path off the optical axis of the optical member;
A subjective optometry apparatus comprising: The subjective optometry apparatus according to claim 1,
The subjective optometry apparatus, wherein the correction means corrects distortion of the target luminous flux based on a correction power of the correction optical system. The subjective optometry apparatus according to claim 1 or 2,
A measurement unit that houses the projection optical system;
A deviation detecting means for detecting a positional deviation of the target luminous flux with respect to the eye to be examined;
The subjective optometry apparatus, wherein the correction means corrects distortion of the target luminous flux based on a detection result detected by the deviation detection means. In the subjective optometry apparatus in any one of Claims 1-3,
The projection optical system has a display, and the target luminous flux is emitted by displaying a target on the display.
The subjective optometry apparatus, wherein the correcting means corrects distortion of the target luminous flux by deforming the target displayed on the display. The subjective optometry apparatus according to claim 4,
The correction means performs at least one of a change in vertical size, a change in horizontal size, and movement of the target in the target displayed on the display, A subjective optometry apparatus that deforms a target and corrects distortion of the target luminous flux. In the subjective optometry apparatus in any one of Claims 1-3,
A movable optical member movable in the optical path of the light projecting optical system;
Driving means for moving the optical member in an optical path of the light projecting optical system;
With
The correction means corrects distortion of the target luminous flux by moving the movable optical member by controlling the driving means. In the subjective optometry apparatus in any one of Claims 1-5,
The optical member guides the target luminous flux to the eye to be optically optically set to a predetermined examination distance. A projection optical system that projects the target luminous flux toward the eye to be examined; and
A correction optical system that is disposed in the optical path of the light projecting optical system and changes the optical characteristics of the target luminous flux;
An optical member for guiding the target luminous flux corrected by the correction optical system to the eye to be examined;
With
The target luminous flux passes through an optical path off the optical axis of the optical member and is guided to the eye to be examined, and the optical characteristics of the eye to be examined are subjectively determined using the target luminous flux guided to the eye to be examined. A subjective optometry device for measuring
A correcting means for correcting an aberration caused by the target luminous flux passing through an optical path deviating from the optical axis of the optical member based on the correction power of the correction optical system. . A projection optical system that projects a target light beam toward the eye to be examined, a correction optical system that is disposed in an optical path of the light projection optical system and changes an optical characteristic of the target light beam, and is corrected by the correction optical system An optical member that guides the target luminous flux to the eye to be examined, and the visual luminous flux passes through an optical path off the optical axis of the optical member and is guided to the eye to be examined. A subjective optometry program for use in a subjective optometry apparatus for subjectively measuring optical characteristics of the eye to be examined using the target luminous flux guided to the eye, and executed by a processor of the subjective optometry apparatus By being
A subjective optometry program that causes the subjective optometry apparatus to execute a correction step of correcting distortion of the target luminous flux caused by the target luminous flux passing through an optical path off the optical axis of the optical member. .