JP2024021350A - subjective optometry device - Google Patents

Abstract

[Problem] To enable smooth temporary frame inspection. [Solution] The subjective optometry device includes an optotype projection optical system for projecting an optotype light beam onto the eye to be examined, and a refractive power disposed in the optical path of the optotype projection optical system to project the optotype light beam onto the eye to be examined. It has a correction optical system that changes the amount of correction, and a light guide optical system that optically guides the image of the optotype light flux through the correction optical system to the eye to be examined so that it becomes a predetermined examination distance. This is a subjective ophthalmoscopy device that subjectively measures the optical characteristics of the eye to be examined in an open state in front of the examiner's eyes. and measurement control means for changing to the corrected state. [Selection diagram] Figure 1

Description

The present disclosure relates to a subjective optometry device that subjectively measures optical characteristics of an eye to be examined.

As a subjective optometry device, a type of device (for example, Patent Document 1) is known in which a lens unit (phoropter) having a corrective optical system consisting of a plurality of lens disks is placed in front of the eye to be examined. In addition, as a subjective optometry device, the image of the test target is guided to the subject's eye via the corrective optical system, and the corrective optical system is not actually placed in front of the subject's eye, allowing it to be placed in a natural state (open state). ) has proposed an apparatus for subjectively measuring the optical characteristics of an eye to be examined (for example, Patent Document 2). Further, this device has a function of automatically aligning a measuring section having a corrective optical system to the eye to be examined.

Japanese Patent Application Publication No. 5-176893 Unexamined Japanese Patent Publication No. 2017-86652

By the way, when prescribing spectacle lenses to the eye to be examined, a temporary frame test using a trial frame is generally performed after subjectively measuring the optical characteristics of the eye to be examined. In the temporary frame test, the subject wears a temporary frame, and the visibility of the test optotype is checked with the test lens inserted into the temporary frame.

However, it has been found that the apparatus disclosed in Patent Document 2, which guides the image of the test optotype to the eye to be examined through a corrective optical system, has some disadvantages when performing a temporary frame test.

In view of the above-mentioned prior art, the technical problem of the present disclosure is to provide a subjective optometry device that can smoothly perform a temporary frame test.

A subjective optometry device provided by a typical embodiment of the present disclosure includes an optotype projection optical system for projecting an optotype light beam onto a subject's eye, and a target projection optical system disposed in an optical path of the optotype projection optical system, a corrective optical system that changes the amount of correction of refractive power imparted to the eye to be examined; and a guide that optically guides the image of the optotype light flux through the corrective optical system to the eye to be examined so that it is at a predetermined examination distance. A subjective ophthalmoscopy device which has a light optical system and which subjectively measures the optical characteristics of the eye to be examined with the subject's eyes open in front of the eye, the device being used for starting a temporary frame examination using a temporary frame. The present invention is characterized by comprising a measurement control means for changing the correction optical system to a non-correction state based on a start signal.

FIG. 1 is a diagram illustrating a schematic external configuration of a subjective optometry device. FIG. 3 is a diagram showing an optical system arranged in a measurement section. FIG. 2 is a schematic configuration diagram of the inside of the subjective optometry device viewed from the front. FIG. 2 is a schematic configuration diagram of the inside of the subjective optometry device viewed from the side. FIG. 2 is a schematic configuration diagram of the inside of the subjective optometry device viewed from above. FIG. 2 is a diagram showing a control system of a subjective optometry device. It is an example of the operation screen of the display in the subjective eye refractive power measurement mode. It is a figure explaining a temporary frame and a test lens. It is a figure which shows the example of a change of the display of the correction amount in a temporary frame inspection.

[overview]
One typical embodiment will be described below with reference to the drawings. Note that the items classified in <> below can be used independently or in conjunction.

The subjective optometry device (for example, the subjective optometrist 1) in this embodiment includes an optotype projection optical system (for example, the optotype projection optical system 30) and a correction optical system (for example, the correction optical system 60). , a light guiding optical system (for example, the light guiding optical system 80), and a measurement control means (for example, the control unit 70). For example, the subjective optometry device includes an automatic alignment means (for example, a first alignment index optical system 55, a second alignment index optical system 40, an observation optical system 50, and a control section 70) and a stop that stops the operation of the automatic alignment means. means (for example, the control unit 70).

For example, the subjective optometry device may include display means (for example, display 6a) and display control means (for example, control section 70). For example, the display control means controls the display on the display means. Further, for example, the subjective optometry device may include changing means (for example, a correction item selection field 614, a plus switch 616a, and a minus switch 616b). For example, the changing means is used to change the value of the amount of correction displayed on the display means.

<Target projection optical system>
For example, the optotype projection optical system projects the optotype light flux of the test optotype onto the eye to be examined. The optotype projecting optical system may have any configuration as long as it projects the optotype light beam, and includes, for example, a configuration that includes a display (for example, the display 31) that displays the optotype, a configuration that includes a DMD (Digital Micromirror Device), or a configuration that includes a DMD (Digital Micromirror Device). It may be any one of a configuration including a board and a light source that illuminates the optotype board from behind.

<Correction optical system>
For example, the correction optical system is disposed in the optical path of the optotype projection optical system, and changes the amount of correction of refractive power applied to the subject's eye. The corrective optical system only needs to be able to change the optical characteristics of the optotype light beam in order to change the amount of correction of refractive power imparted to the subject's eye. For example, the correction optical system may include a spherical correction optical system (for example, the drive mechanism 39) and an astigmatism correction optical system (for example, the astigmatism correction optical system 63). For example, a spherical correction optical system changes the amount of correction of spherical refractive power imparted to the subject's eye. For example, the astigmatism correcting optical system changes the amount of astigmatic refractive power correction applied to the eye to be examined. For example, the corrective optical system may include a right eye corrective optical system and a left eye corrective optical system provided in a pair on the left and right.

<Light guiding optical system>
For example, the light guiding optical system optically guides the image of the optotype light flux that has passed through the correction optical system to the subject's eye so that it is at a predetermined examination distance. For example, the light guide optical system includes, as an optical member, a concave mirror (eg, concave mirror 85) for optically adjusting the image of the optotype light beam to a predetermined inspection distance. For example, the light guiding optical system may be a lens instead of a concave mirror as long as it can optically guide the image of the target light flux through the corrective optical system to the subject's eye so as to be at a predetermined examination distance. . For example, with this light guide optical system, it is possible to consciously measure the optical characteristics of the subject's eye with the subject's eyes open in an open state. That is, it is possible to measure the optical characteristics of the eye to be examined without placing a corrective optical system in front of the eye of the examinee. For example, the area in front of the subject's eyes is defined as the vicinity where eyeglass lenses are located when wearing eyeglasses.

In addition, when the corrective optical system is composed of a corrective optical system for the right eye and a corrective optical system for the left eye, which are provided in a pair on the left and right, the light guiding optical system is connected to the optical path for the right eye including the corrective optical system for the right eye. , and a left eye optical path including a left eye correction optical system.

<Measurement control means>
For example, the measurement control means changes the correction optical system to a non-correction state based on a start signal for starting a temporary frame inspection using a temporary frame. For example, changing the correcting optical system to a non-correcting state may mean substantially reducing the amount of correction of the correcting optical system to zero. In this case, for example, it is sufficient if the spherical power and astigmatic power given to the eye to be examined can be set to zero. In other words, the uncorrected state of the corrective optical system may be a state in which no correction is performed on the eye to be examined. As a result, even with a configuration in which the test optotype is presented via the corrective optical system, the temporary frame test can be appropriately performed while showing the test optotype to the eye to be examined. Therefore, temporary frame inspection can be carried out smoothly.

Note that, for example, the subjective optometric apparatus may include a start signal input means (for example, a temporary frame inspection button 630). For example, the start signal input means is used to input a start signal for starting a temporary frame inspection using a temporary frame.

Further, for example, when the subjective optometry apparatus includes a changing means, the measurement control means may leave the corrective optical system in the non-correcting state even when the value of the correction amount is changed by the changing means. In other words, the measurement control means may maintain the non-correction state of the correction optical system, and the change means may change the value of the correction amount displayed on the display means. This allows the examiner to change only the value of the correction amount on the display when changing the correction amount of the test lens set in the temporary frame, and the final result (prescription power) of the temporary frame inspection can be adjusted appropriately. can be output and managed.

<Automatic alignment means>
For example, the automatic alignment means detects the alignment state of the corrective optical system with respect to the eye to be examined (for example, the naked eye to be examined), and automatically aligns the corrective optical system to the eye to be examined based on the detection. For example, the automatic alignment means may include alignment detection means (for example, the image sensor 52, the position detection element 48, and the control section 70). For example, the alignment detection means detects the alignment state of the corrective optical system with respect to the eye to be examined. For example, the alignment detection means detects the alignment index projected onto the subject's eye by the alignment index light projection means (for example, the first alignment index optical system 55, the second alignment index optical system 40), thereby determining the alignment state. To detect. Further, for example, the alignment detection means may detect the alignment state based on the anterior segment image of the subject's eye captured by the imaging means (for example, the image sensor 52).

For example, the automatic alignment means includes a drive means (for example, drive unit 83, drive mechanism 82) that three-dimensionally drives the corrective optical system with respect to the eye to be examined, and an alignment control means (for example, a control unit) that controls the drive means. 70). For example, the alignment control means automatically aligns the corrective optical system in a predetermined positional relationship with respect to the eye to be examined by controlling the drive means based on the alignment state detected by the alignment detection means.

Note that the automatic alignment means may align the corrective optical system with respect to the eye to be examined even while the subjective eye refractive power is being measured by the corrective optical system before the temporary frame inspection. That is, for example, the automatic alignment means may include automatic tracking of alignment. For example, automatic alignment tracking is performed such that when the alignment state falls outside a predetermined tolerance range, the alignment state returns to the predetermined tolerance range.

For example, when the corrective optical system has a corrective optical system for the right eye and a corrective optical system for the left eye, which are provided as a pair of left and right eyes, the automatic alignment means is configured to align the corrective optical system for the right eye and the corrective optical system for the left eye with respect to the left and right eyes to be examined. Each of the ophthalmic corrective optical systems may be configured to be automatically aligned.

<Stopping means>
For example, the stopping means stops the operation of the automatic alignment means based on the temporary frame inspection start signal. For example, the stopping means stops the automatic alignment means, which is activated when measuring the optical characteristics (for example, eye refractive power) of the naked eye to be examined, based on the start signal of the temporary frame test. This makes it possible to reduce the possibility of erroneous detection of the alignment state or malfunction of automatic tracking due to the temporary frame test lens being placed in front of the subject's eye during the temporary frame test.

For example, the stopping means may include substantially stopping the alignment operation. For example, the stopping means may include either a first stopping means that directly stops the operation of the automatic alignment means, or a second stopping means that changes the detection condition of the alignment state so that the automatic alignment means does not operate. It may be configured as follows. For example, the first stopping means stops the operation of the automatic alignment means even if there is an alignment state detection signal. In this case, the first stopping means may include disabling (OFF) the alignment state detection signal. Alternatively, for example, the first stopping means may stop the signal for operating the drive section of the automatic alignment means even if there is an alignment state detection signal. On the other hand, for example, the second stopping means detects the alignment state with respect to the detection condition of the alignment state at the time of measurement of the optical characteristics (e.g., eye refractive power) of the eye to be examined using the corrective optical system before the temporary frame inspection. By changing the conditions, the automatic alignment means may be made substantially ineffective. Specifically, for example, the second stopping means turns off the light sources (for example, the anterior segment illumination unit 95, the light source 56, and the light source 41) used for alignment of measurements before the temporary frame test (in the case of dimming). ), the automatic alignment means may be made substantially ineffective by preventing the alignment light from being detected by the detection elements used for alignment (for example, the image sensor 52 and the position detection element 48). Alternatively, for example, the second stopping means prevents the automatic alignment means from being substantially effective by preventing detection signals from the detection elements (for example, the image sensor 52, the position detection element 48) used for alignment from being output. You may choose not to have one.

Note that, for example, the stopping means stops the operation of the automatic alignment means (this is referred to as the first automatic alignment means) when measuring the optical characteristics (e.g., eye refractive power) of the eye to be examined (naked eye) before the temporary frame test. It is fine as long as it is done. For example, with respect to the first automatic alignment means before the temporary frame inspection, the detection conditions of the alignment state are set so as to reduce the influence of reflected light generated by placing the temporary frame test lens in front of the subject's eye. Even if a configuration is adopted in which the second automatic alignment means is changed, the above-mentioned stopping means stops the first automatic alignment means for the naked eye before the temporary frame test. May contain.

<Display means, display control means>
For example, the display means displays the values of the amount of correction (for example, the values of the spherical power S, the astigmatic power C, and the astigmatic axis angle A) measured by the corrective optical system. For example, the display control means controls the display means so that even when the corrective optical system is changed to a non-corrective state based on the start signal of the temporary frame inspection, the display control means may control the display means to display the data measured by the corrective optical system immediately before the input of the start signal. The value of the correction amount is displayed on the display means. Thereby, the examiner can know the correction value obtained through the subjective test when setting the test lens in the temporary frame, and can smoothly perform the temporary frame inspection. Additionally, the examiner can output and manage the results of the temporary frame inspection.

Note that the display control means displays the value of the correction amount in the first display area (for example, the right eye correction amount display field 618R and the left eye correction amount display field 618L) that displays the results of subjective eye refractive power measurement by the corrective optical system. It may be displayed as is. Alternatively, for example, the display control means may copy the value obtained in the subjective eye refraction measurement immediately before the start signal of the temporary frame test is input, and may copy the value obtained in the subjective eye refraction measurement immediately before the start signal of the temporary frame test is input, and It may be displayed in columns 568R and 658L). In this case, the display control means may display the value of the correction amount displayed in the first display area in conjunction with the correction optical system.

<Configuration of each means>
In addition, in this embodiment, a configuration may be adopted in which at least one of the measurement control means, the stop means, and the display control means is also used. Furthermore, a configuration may be adopted in which the measurement control means, the stop means, and the display control means are each provided separately. Of course, these means may be constituted by a plurality of control means.

[Example]
An example of the subjective optometry device according to the present embodiment will be described. FIG. 1 is a diagram showing a schematic external appearance of a subjective optometry device 1. As shown in FIG. In this embodiment, the subjective ophthalmoscopy device 1 includes a subjective measurement unit that subjectively measures the optical characteristics (e.g., eye refractive power) of the eye to be examined, and a subjective measurement unit that subjectively measures the optical characteristics (e.g., eye refractive power) of the eye to be examined. An example of a device equipped with an objective measuring unit that measures objectively will be described. In addition, in FIG. 1, when viewed from the subject side, the left-right direction (horizontal direction) will be described as the X direction, the up-down direction (vertical direction) as the Y direction, and the front-back direction as the Z direction.

For example, the subjective optometry device 1 includes a housing 2, a presentation window 3, a forehead rest 4, a chin rest 5, a controller 6, a measurement section 7, an imaging section 90, an anterior segment illumination section 95, and the like.

The presentation window 3 is used to present an optotype to the eye to be examined. The forehead rest 4, which is placed against the subject's forehead, is used to maintain a constant distance between the subject's eye and the subjective optometry device 1. The chin rest 5 on which the subject's chin is placed is used to maintain a constant distance between the subject's eye and the subjective optometry device 1. Note that the chin rest 5 does not necessarily have to be provided.

The controller 6, which is an example of an operation section, includes a display 6a, which is an example of display means, a switch section 6b, and the like. The display 6a displays various information (for example, measurement results of the eye to be examined, etc.). The display 6a has a touch panel function, and the display 6a also functions as a switch section 6b. The switch section 6b may be used to perform various settings (for example, input of various operation signals, etc.). A signal corresponding to an operation instruction from the controller 6 is output to a control unit 70 (see FIG. 6), which will be described later, through at least one of wired communication via a cable or the like, or wireless communication via infrared rays or the like.

The imaging unit 90 includes an imaging optical system (not shown). For example, the imaging optical system is used to image the subject's face. For example, the imaging optical system may include an imaging element and a lens. The anterior segment illumination unit 95 has an infrared illumination light source (not shown) disposed therein, and transmits illumination light to the left and right sides for imaging the anterior segment of the subject's eye using an observation optical system 50 (see FIG. 2), which will be described later. The light is emitted toward the subject's eye.

<Measurement part>
The measurement section 7 includes a left eye measurement section 7L and a right eye measurement section 7R. In this embodiment, the left eye measurement section 7L and the right eye measurement section 7R are constructed from the same member. Of course, at least a portion of the left eye measurement section 7L and the right eye measurement section 7R may be made of different members. The measurement unit 7 includes a pair of left and right visual target projection optical systems, which will be described later, a pair of left and right subjective measurement units, which will be described later, and a pair of left and right objective measurement units, which will be described later. The optotype light flux and the measurement light flux from the measurement unit 7 are guided to the subject's eye via the presentation window 3.

FIG. 2 is a diagram showing an optical system arranged in the measuring section 7. As shown in FIG. In FIG. 2, as the measurement unit 7, a left eye measurement unit 7L is taken as an example. The right eye measurement section 7R has the same configuration as the left eye measurement section 7L, and therefore will be omitted. For example, the left eye measurement unit 7L includes an optotype projection optical system 30, a subjective measurement optical system 25, an objective measurement optical system 10, a first alignment index optical system 55, a second alignment index optical system 40, and an observation target optical system 30. It includes an optical system 50, etc.

<Target projection optical system>
The optotype projection optical system 30 projects the optotype light flux onto the subject's eye. For example, the target projection optical system 30 includes a display 31, a projection lens 33, a projection lens 34, a reflection mirror 36, an objective lens 37, a dichroic mirror 35, a dichroic mirror 29, and the like.

The display 31 displays visual targets (fixation targets, test visual targets, etc.). The optotype light flux emitted from the display 31 passes through optical members from the projection lens 33 to the dichroic mirror 29 in order and is projected onto the left eye E to be examined. The dichroic mirror 35 makes the optical path of the objective measurement optical system 10 and the optical path of the subjective measurement optical system 25 a common optical path. That is, the dichroic mirror 35 makes the optical axis L1 of the objective measurement optical system 10 and the optical axis L2 of the subjective measurement optical system 25 coaxial. Dichroic mirror 29 is an optical path branching member. The dichroic mirror 29 reflects a target light beam from the target projection optical system 30 and a measurement light beam from the projection optical system 10a, which will be described later, and guides them to the eye E to be examined.

Note that in this embodiment, the display 31 is used as a light source for projecting the optotype light beam, but the present invention is not limited to this. The optotype projection optical system 30 may have any configuration as long as it projects the optotype light flux. For example, a DMD (Digital Micromirror Device) may be used. The DMD has a high reflectance and can maintain a high amount of optotype light flux compared to a liquid crystal display that uses polarized light. Furthermore, for example, instead of the display, a configuration may be provided that includes an optotype board that is switched and placed in the optical path and a light source that illuminates the optotype board from behind. For example, the optotype board may be composed of a disk plate rotated by a motor or the like, and may have a plurality of optotypes such as a visual acuity value optotype used in measuring the subjective eye refractive power.

<Subjective measurement optical system>
The subjective measurement optical system 25 is used as part of the configuration of a subjective measurement unit that subjectively measures the optical characteristics of the eye E to be examined. In this embodiment, a subjective measuring unit that measures the eye refractive power of the eye E to be examined is taken as an example of the optical characteristics of the eye E to be examined. In addition to the eye refractive power, the optical characteristics of the eye E to be examined may include contrast sensitivity, binocular vision function (for example, tropism, stereoscopic vision function, etc.). For example, the subjective measurement optical system 25 is composed of the above-mentioned optotype projecting optical system 30 and the correction optical system 60.

<Correction optical system>
The correction optical system 60 is arranged in the optical path of the optotype projection optical system 30. Further, the correction optical system 60 changes the optical characteristics of the optotype light flux from the display 31. Thereby, for example, the corrective optical system 60 changes the amount of correction of refractive power (spherical refractive power, astigmatic refractive power) provided to the eye to be examined. For example, the correction optical system 60 includes an astigmatism correction optical system 63, a drive mechanism 39 used as a spherical correction optical system, and the like.

The astigmatism correction optical system 63 is used to correct the astigmatism power (cylindrical power) and astigmatism axis angle of the eye E to be examined. In this embodiment, the astigmatism correction optical system 63 is arranged between the light projecting lens 33 and the light projecting lens 34. The astigmatism correcting optical system 63 is composed of two positive cylindrical lenses 61a and 61b having the same focal length. The cylindrical lens 61a and the cylindrical lens 61b each rotate independently about the optical axis L2 by driving the rotation mechanism 62a and the rotation mechanism 62b.

In this embodiment, the astigmatism correcting optical system 63 has been described using the cylindrical lens 61a and the cylindrical lens 61b as an example, but the present invention is not limited to this. The astigmatism correction optical system 63 may have any configuration as long as it can correct the cylindrical power, astigmatism axis angle, and the like. As an example, a corrective lens may be inserted into and removed from the optical path of the optotype projection optical system 30.

In this embodiment, the display 31 included in the optotype projection optical system 30 is moved in the direction of the optical axis L2 of the optotype projection optical system 30 by the drive mechanism 39. For example, the drive mechanism 39 includes a motor and a slide mechanism. For example, during subjective measurement, by moving the display 31, the presentation position (presentation distance) of the optotype with respect to the eye to be examined is optically changed, and the spherical refractive power of the eye to be examined is corrected. That is, in this embodiment, a spherical power correcting optical system is constructed by moving the display 31. Then, by moving the display 31, the spherical power is measured based on the optical distance of the test optotype with respect to the reference position.

Note that the spherical power correcting optical system is not limited to this. For example, a spherical power correction optical system may have a configuration in which the correction is performed by having a large number of optical elements, and the optical elements are arranged in the optical path. Further, for example, a configuration may be adopted in which a lens disposed in the optical path is moved in the optical axis direction.

<Objective measurement optical system>
The objective measurement optical system 10 is used as part of the configuration of an objective measurement unit that objectively measures the optical characteristics of the eye E to be examined. In this embodiment, the optical characteristics of the eye E to be examined will be described using an objective measuring unit that measures the eye refractive power of the eye E to be examined as an example. For example, the objective measurement optical system 10 includes a projection optical system 10a and a light receiving optical system 10b.

The projection optical system 10a projects a spot-shaped measurement index onto the fundus of the eye E to be examined via the center of the pupil of the eye E to be examined. For example, the projection optical system 10a includes a light source 11, a relay lens 12, a hall mirror 13, a prism 15, an objective lens 14, a dichroic mirror 35, a dichroic mirror 29, and the like.

The light source 11 emits a measurement light beam. The light source 11 has a conjugate relationship with the fundus of the eye E to be examined. The hole portion of the hall mirror 13 has a conjugate relationship with the pupil of the eye E to be examined. The prism 15 is a light beam deflecting member. The prism 15 is arranged at a position away from the conjugate position with the pupil of the eye E, and decenters the measurement light flux passing through the prism 15 with respect to the optical axis L1. The prism 15 is rotationally driven by a drive unit (for example, a motor) 23 about the optical axis L1.

The light-receiving optical system 10b extracts the fundus-reflected light flux reflected from the fundus of the eye E to be examined in a ring shape through the periphery of the pupil of the eye E to be examined. For example, the light receiving optical system 10b includes a dichroic mirror 29, a dichroic mirror 35, an objective lens 14, a prism 15, a hall mirror 13, a relay lens 16, a mirror 17, a light receiving aperture 18, a collimator lens 19, a ring lens 20, an image sensor 22, Equipped with etc.

The ring lens 20 includes a ring-shaped lens part and a light-shielding part in which a region other than the lens part is coated with a light-shielding coating. The ring lens 20 has an optically conjugate positional relationship with the pupil of the eye E to be examined. The light receiving aperture 18 and the image sensor 22 are in a conjugate relationship with the fundus of the eye E to be examined. The output from the image sensor 22 is input to the control section 70.

In the above configuration, the measurement light beam emitted from the light source 11 passes through the relay lens 12, the hall mirror 13, and the optical members from the prism 15 to the dichroic mirror 29 in order, and forms a spot on the fundus of the eye E to be examined. Forms a point light source image. At this time, the pupil projected image (projected light flux on the pupil) of the hole portion of the hall mirror 13 is eccentrically rotated at high speed by the prism 15 rotating around the optical axis. When the point light source image projected on the fundus is reflected and scattered and exits from the eye E, it is reflected by the dichroic mirror 29 and the dichroic mirror 35, condensed by the objective lens 102, and then passed through the prism 15 and hall mirror 13, which rotate at high speed. , the relay lens 16, and the mirror 17, and when the light is again focused on the light receiving aperture 18, the collimator lens 19 and the ring lens 20 form a ring-shaped image on the imaging device 22.

In this embodiment, the prism 15 is arranged on the common optical axis of the projection optical system 10a and the light receiving optical system 10b. For example, the measurement light flux from the projection optical system 10a passes through the prism 15 and enters the eye E, and the fundus reflected light flux reflected from the fundus of the eye E passes through the same prism 15. , the reverse scan is performed as if there were no eccentricity of the projected light flux and fundus reflected light flux (received light flux) on the pupil.

Note that the eye refractive power measuring optical system, which is an example of the objective measuring optical system 10, is not limited to the above as long as the eye refractive power can be obtained. For example, the configuration may include a Shack-Hartmann sensor. For these details, please refer to, for example, Japanese Patent Application Publication No. 2018-47049.

Further, the light source 11 and relay lens 12 included in the projection optical system 10a, and the light receiving aperture 18, collimator lens 19, ring lens 20, and image sensor 22 included in the light receiving optical system 10b are movable integrally in the optical axis direction. It has become. In this embodiment, these are synchronously moved as a drive unit 95 by a drive mechanism 39 that moves the display 31 . The movement position of the drive unit 95 moved by the drive mechanism 39 is detected by a detector (not shown). Of course, these may be configured to be driven individually.

By moving the drive unit 95 in the optical axis direction, the light source 11, the light receiving aperture 18, and the image sensor 22 are arranged so as to be optically conjugate with respect to the fundus of the eye E to be examined. Note that regardless of movement of the drive unit 95, 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. Therefore, the fundus reflected light flux, which is the measurement light flux of the projection optical system 10a reflected, always enters the ring lens 20 of the light receiving optical system 10b as a parallel light flux, and regardless of the eye refractive power of the eye E, Ring-shaped light beams of the same size are imaged by the image sensor 22 in a focused state.

<Alignment index optical system>
The alignment index optical system of this embodiment includes a first alignment index optical system 55 and a second alignment index optical system 40.

The first alignment index optical system 55 includes a light source 56 that emits near-infrared light, a collimator lens 57, and a half mirror 58. The light emitted from the light source 56 is made into a substantially parallel beam by a collimator lens 57, and is reflected by a half mirror 58 so that it is coaxial with the optical axis L1 of the objective measuring optical system 10. Thereafter, the light from the light source 56 is reflected by the dichroic mirror 35 and the dichroic mirror 29, and is projected onto the eye E from the front direction of the eye E. The first alignment index optical system 55 is used to detect the alignment state of the eye E to be examined in the XY directions.

The second alignment index optical system 40 includes a light projection optical system 40a and a detection optical system 40b. The projection optical system 40a includes a light source 41 that emits near-infrared light and a collimator lens 42, and projects an index light toward the cornea of the eye E from an oblique direction. The optical axis of the detection optical system 40b is arranged in contrast to the optical axis of the projection optical system 40a with respect to the optical axis L3 of the observation optical system 50. The detection optical system 40b includes a lens 46, a condensing lens 47, and a position detection element 48. The illumination light projected by the light source 41 is reflected by the cornea of the eye E to be examined, thereby forming an index image (corneal reflection bright spot) that is a virtual image of the light source 41. The light of the index image enters the position detection element 48 via the lens 46 and the condensing lens 47. The position of the index image on the position detection element 48 changes depending on the position of the eye E to be examined in the Z direction. The output signal of the position detection element 48 is output to the control section 70, and the alignment state of the eye E to be examined in the Z direction is detected by the control section 70.

<Observation optical system>
The observation optical system (imaging optical system) 50 includes a dichroic mirror 29, an objective lens 53, an imaging lens 51, an imaging element 52, and the like. The dichroic mirror 29 transmits the anterior segment observation light and the alignment light. The imaging device 52 has an imaging surface arranged at a position conjugate with the anterior segment of the eye E to be examined. The output from the image sensor 52 is input to the control section 70. Thereby, an anterior segment image of the eye E to be examined is captured by the image sensor 52 and displayed on the display 6a.

The observation optical system 50 also serves as a detection optical system that detects the index image formed on the cornea of the eye E by the first alignment index optical system 55. That is, when the light from the light source 56 of the first alignment index optical system 55 is reflected by the cornea of the eye E, an index image (corneal reflection bright spot) which is a virtual image of the light source 56 is formed, and the index image is The light is received by the image sensor 52. Based on the output signal of the image sensor 52, the control unit 70 detects the position of the index image, thereby detecting the alignment state of the eye E in the X and Y directions.

<Internal configuration of optometry device and light guide optical system>
The internal configuration of the subjective optometry device 1 will be explained. FIG. 3 is a schematic configuration diagram of the inside of the subjective optometry device 1 viewed from the front. FIG. 4 is a schematic configuration diagram of the inside of the subjective optometry device 1 viewed from the side. FIG. 5 is a schematic configuration diagram of the interior of the subjective optometry device 1 viewed from above. Note that in FIGS. 4 and 5, only the optical axis of the left eye measurement section 7L is shown for convenience of explanation.

The subjective optometry device 1 includes a light guiding optical system 80 that guides an image of the optotype light flux from the measurement unit 7 to the eye to be examined. The light guide optical system 80 of this embodiment includes a deflection mirror 81, a reflection mirror 84, a concave mirror 85, etc., which are examples of light deflection members. Further, the subjective optometry device 1 includes a drive mechanism 82 and a drive section 83 as components related to the light guide optical system 80. The light guide optical system 80 uses a concave mirror 85 as a light guide optical member to optically guide the image of the optotype light flux that has passed through the correction optical system 60 to the subject's eye at a predetermined inspection distance during subjective measurement. do.

Note that the light guiding optical system 80 is not limited to this configuration. For example, the light guiding optical system 80 may be configured without the reflecting mirror 84. In this case, the optotype light flux from the measurement unit 7 may be irradiated obliquely with respect to the optical axis L of the concave mirror 85 after passing through the deflection mirror 81. Further, for example, the light guide optical system 80 may have a configuration including a half mirror. In this case, the optotype light flux from the measurement unit 7 may be irradiated obliquely with respect to the optical axis L of the concave mirror 85 via a half mirror, and the reflected light flux may be guided to the eye E to be examined. .

The subjective optometry device 1 includes a left eye drive section 9L and a right eye drive section 9R, and the left eye measurement section 7L and the right eye measurement section 7R are arranged in the X direction (horizontal direction). ). For example, by moving the left eye measuring section 7L and the right eye measuring section 7R in the X direction, the distance between the measuring section 7 and a deflection mirror 81, which will be described later, changes, and the visual field from the measuring section 7 changes. The presentation position of the marker beam in the Z direction (front-back direction with respect to the subject) is changed. As a result, the target light beam corrected by the corrective optical system 60 is guided to the eye E to be examined, and an image of the target light beam corrected by the corrective optical system 60 is formed on the fundus of the eye E to be examined. The measuring section 7 is 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, which are provided in a pair on the left and right sides, respectively. For example, the deflection mirror 81 is placed between the measurement unit 7 and the eye E to be examined. In this embodiment, the deflection mirror 81R is arranged between the measurement section 7R and the eye to be examined ER, and the deflection mirror 81L is arranged between the measurement section 7L and the eye to be examined EL. That is, the deflection mirror 81 is arranged in a shared optical path of the objective optical system 10 of the measuring section 7 and the visual target projection optical system 30. Furthermore, the deflection mirror 81 is also arranged in the optical path of the subjective measurement optical system 25. Note that the deflection mirror 81 is preferably arranged at a pupil conjugate position.

For example, the left eye deflection mirror 81L reflects the light beam projected from the left eye measurement section 7L and guides it to the left eye EL. Further, for example, the left eye deflection mirror 81L reflects the fundus reflected light flux from the left eye EL and guides it to the left eye measurement section 7L. For example, the right eye deflection mirror 81R reflects the light beam projected from the right eye measurement section 7R and guides it to the right eye ER. Further, for example, the right eye deflection mirror 81R reflects the fundus reflected light flux from the right eye ER and guides it to the right eye measurement section 7R. In this embodiment, a configuration is described in which a deflection mirror 81 is used as a deflection member that reflects and guides the light beam projected from the measurement unit 7 onto the eye E, but the present invention is not limited to this. Not done. The deflection member may be a prism, a lens, or the like as long as it can reflect and guide the light beam projected from the measurement unit 7 onto the eye E to be examined.

For example, the drive mechanism 82 includes a motor (drive section) or the like. For example, the drive mechanism 82 includes a drive mechanism 82L for driving the left eye deflection mirror 81L, and a drive mechanism 82R for driving the right eye deflection mirror 81R. For example, the deflection mirror 81 is rotated by driving the drive mechanism 82 . For example, the drive mechanism 82 rotates the deflection mirror 81 about a rotation axis in the horizontal direction (X direction) and a rotation axis in the vertical direction (Y direction). That is, the drive mechanism 82 rotates the deflection mirror 81 in the XY directions. Note that the deflection mirror 81 may be rotated in either the horizontal direction or the vertical direction.

For example, the drive unit 83 includes a motor 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, the deflection mirror 81 is moved in the X direction by driving the drive unit 83. For example, by moving the left eye deflection mirror 81L and the right eye deflection mirror 81R, the distance between the left eye deflection mirror 81L and the right eye deflection mirror 81R is changed, and the distance between the pupils of the eye E is changed. The distance in the X direction between the left eye optical path and the right eye optical path can be changed according to the distance.

Note that, 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, a configuration in which two deflection mirrors are provided in the left-eye optical path, etc.) is exemplified. 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, by rotationally moving the deflection mirror 81, an apparent light beam for forming an image of the optotype light flux in front of the subject's eye E is deflected, and the formation position of the image of the optotype light flux is optically corrected. be able to.

For example, the concave mirror 85 is shared by the left eye measurement section 7L and the right eye measurement section 7R. For example, the concave mirror 85 is shared by a left eye optical path that includes a left eye corrective optical system and a right eye optical path that includes a right eye corrective optical system. That is, the concave mirror 85 is arranged at a position where it passes through both the left eye optical path including the left eye corrective optical system and the right eye optical path including the right eye corrective optical system. Of course, the concave mirror 85 does not have to be shared by the left eye optical path and the right eye optical path. For example, a concave mirror may be provided in each of the left eye optical path including the left eye corrective optical system and the right eye optical path including the right eye corrective optical system. For example, the concave mirror 85 guides the optotype light beam corrected by the correction optical system 60 to the eye E to be examined so as to optically reach a predetermined examination distance. That is, the light guiding optical system 80 including the concave mirror 85 allows the area in front of the subject's eyes to be opened without placing the correction optical system 60 in front of the subject's eyes.

For example, the concave mirror 85 is used for both the subjective measurement section and the objective measurement section. For example, the optotype light beam projected from the subjective measurement optical system 25 is projected onto the subject's eye via the concave mirror 85. Further, for example, the measurement light projected from the objective measurement optical system 10 is projected onto the subject's eye via the concave mirror 85. Further, 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 10b of the objective measurement optical system 10 via the concave mirror 85. In this embodiment, a configuration is exemplified in which the measurement light reflected by the objective measurement optical system 10 is guided to the light receiving optical system 10b of the objective measurement optical system 10 via the concave mirror 85. However, it is not limited to this. The measurement light reflected by the objective measurement optical system 10 may be configured not to pass through the concave mirror 85.

<Light path of subjective measurement unit>
The optical path of the subjective measurement unit will be explained. The subjective measuring unit guides the optotype light flux to the eye E by reflecting the optotype light flux that has passed through the corrective optical system 60 in the direction of the eye to be examined using the concave mirror 85, and the visual target light flux that has passed through the corrective optical system 60 An image of the target beam is optically formed in front of the subject's eyes at a predetermined inspection distance. That is, the concave mirror 85 reflects the optotype light flux so as to make it a substantially parallel light flux. Therefore, the optotype image seen by the subject appears to be farther away than the actual distance from the eye E to the display 31. That is, by using the concave mirror 85, the optotype image can be presented to the subject so that the image of the optotype light beam can be seen at a position at a predetermined examination distance.

This will be explained in more detail. In addition, in the following description, the left eye optical path will be described as an example. The right eye optical path also has the same configuration as the left eye optical path. For example, in the left eye subjective measurement means, the optotype light beam projected from the display 13 of the left eye measurement means 7L enters the astigmatism correction optical system 63 via the projection lens 33. The optotype light flux that has passed through the astigmatism correction optical system 63 is projected from the left eye measurement means 7L to the left eye deflection mirror 81L via the reflection mirror 36, dichroic mirror 35, and dichroic mirror 29. The optotype light flux emitted from the left eye measurement means 7L and reflected by the left eye deflection mirror 81 is reflected by the reflection mirror 84 toward the concave mirror 85. The optotype light flux reflected by the concave mirror reaches the left eye EL.

As a result, an optotype image corrected by the corrective optical system 60 is formed on the fundus of the left eye EL with the eyeglass wearing position of the subject's left eye EL (for example, about 12 mm from the corneal apex) as a reference. Therefore, the astigmatism correcting optical system 63 was arranged as if in front of the eye, and the adjustment of the spherical power by the spherical power correcting optical system (in this embodiment, the drive of the drive mechanism 39) was performed in front of the eye. The subject can collimate the image of the optotype through the concave mirror 85 in a natural open state. The optical path for the right eye has the same configuration as the optical path for the left eye, and the pair of right and left corrective optical systems 60 uses the glasses wearing position of the left and right eyes E as a reference (for example, about 12 mm from the corneal apex). Corrected optotype images are formed on the fundus of both eyes to be examined. In this way, the subject responds to the examiner while looking directly at the optotype in a state of natural vision, performs correction using the correction optical system 60 until the test optotype looks appropriate, and then uses the correction optical system 60 to correct the test optotype until it appears properly. The optical characteristics of the eye to be examined are measured subjectively.

<Optical path of objective measurement unit>
The optical path of the objective measuring section will be explained. In the following description, the left eye optical path will be described as an example, but the right eye optical path also has the same configuration as the left eye optical path. For example, in the objective measurement unit for the left eye, the measurement light emitted from the light source 11 of the projection optical system 10a in the objective measurement optical system 10 passes through the dichroic mirror 29 from the relay lens 12, and The image is projected from the measurement unit 7L toward the left eye deflection mirror 81L. The measurement light emitted from the left eye measurement section 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 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 (the projected light flux on the pupil) of the hole 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 EL is reflected and scattered, exits the eye E, is condensed by the objective lens 14 via the optical path through which the measurement light passes, and is condensed by the prism 15, It reaches the hall mirror 13, relay lens 16, and mirror 17. The light reflected by the mirror 17 is again focused on the aperture of the light-receiving diaphragm 18, turned into a substantially parallel light beam by the collimator lens 19 (in the case of emmetropic eyes), and taken out as a ring-shaped light beam by the ring lens 20. The light is received by the image sensor 22 as an image. By analyzing the received ring image, the optical characteristics of the eye E can be measured objectively.

<Control unit>
FIG. 6 is a diagram showing a control system of the subjective optometry device 1. As shown in FIG. For example, the control unit 70 includes the imaging unit 90, the anterior segment illumination unit 95, the display 6a of the controller 6, the switch unit 6b, the light source 11 included in the measurement unit 7, the imaging device 22, the display 31, the imaging device 52, and the drive mechanism. 39, rotation mechanism 62a, rotation mechanism 62b, light source 56 of first alignment index optical system 55, light source 41 and position detection element 48 of second alignment index optical system 40, drive mechanism 82 of light guide optical system 80, drive section 83 , etc. are connected. Further, a memory 75 (for example, a non-volatile memory), which is an example of a storage means, and a printer 77 are connected to the control unit 70. For example, the memory 75 is a non-transitory storage medium that can retain stored contents even if the power supply is cut off. For example, as the memory 75, a hard disk drive, flash ROM, USB memory, etc. can be used. The measurement results are printed out from the printer 77.

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

Note that the control unit 70 also functions as a display control unit that controls the display on the display 6a and the display on the display 31. The control unit 70 also functions as a measurement control unit that controls the drive system (the drive mechanism 39, the rotation mechanism 62a, and the rotation mechanism 62b) of the correction optical system 60. The control unit 70 also functions as an alignment control unit that controls the drive mechanism 82 and drive unit 83 of the light guiding optical system 80.

<Operation>
The operation of the subjective optometry device 1 having the above configuration will be explained. The subject places his forehead on the forehead rest 4 and observes the presentation window 3. When the examinee is ready for the examination, the examiner operates the touch panel (or switch section 6b) of the display 6a of the controller 6 to send a selection signal for the visual target (fixation target) for fixating the eye E to be examined. input. The control unit 70 causes the displays 31 provided in each of the left eye measurement unit 7L and the right eye measurement unit 7R to display the same optotype based on the optotype selection signal. Visual targets are presented to the left and right eyes E (left eye EL and right eye ER), but when the same visual target is presented, the subject recognizes it as one visual target with both eyes. . Note that in the case of monocular measurement, the optotype is displayed only on the display 31 on the measuring eye side.

<Alignment of the measurement unit with respect to the eye to be examined>
Next, the examiner sends a start signal to the left eye EL and right eye ER of the subject to align the left eye measurement section 7L and the right eye measurement section 7R, respectively, using the touch panel (or switch section) of the display 6a. 6b). An index by the first alignment index optical system 55 and an index by the second alignment index optical system 40 are projected onto the left eye EL and the right eye ER, respectively. As a result, the automatic alignment means is operated to three-dimensionally align the measurement unit 7 including the correction optical system 60 and the like with respect to the eye E to be examined in a predetermined positional relationship. The operation of the automatic alignment means will be explained below.

The index provided by the first alignment index optical system 55 is received by the image sensor 52, and the alignment state of the measurement unit 7 in the XY directions is detected based on the output signal from the image sensor 52. The control unit 70 controls the driving of the drive mechanism 82 (82L, 82R) and the drive unit 83 (83L, 83R) based on the detection result of the alignment state of the measurement unit 7 in the XY directions, and automatically performs the alignment in the XY directions. Adjust to. Specifically, for example, the alignment light of the first alignment index optical system 55 is projected from the front direction of the eye E to be examined, and the light is reflected by the cornea, so that the image of the eye to be examined is displayed on the image sensor 52. An index indicating a reflective bright spot at the center of the cornea is imaged. The measurement unit 7 ( The alignment of the optical axes of the objective measurement optical system 10 and the correction optical system 60 of the subjective measurement optical system 25 in the XY directions is adjusted.

Note that the alignment adjustment in the XY directions may be performed based on the detection result of the center of the pupil of the subject's eye captured by the image sensor 52. The anterior segment of the eye including the pupil of the subject's eye is illuminated by the anterior segment illumination unit 95 and is imaged by the image sensor 52 .

Further, the index provided by the second alignment index optical system 40 is received by the position detection element 48, and the alignment state of the measuring section 7 in the Z direction is detected based on the output signal of the position detection element 48. The control unit 70 controls the driving of the drive unit 9 (9L, 9R) based on the detection result of the alignment state of the measurement unit 7 in the Z direction, and automatically adjusts the alignment in the Z direction. Specifically, for example, by projecting the index of the second alignment index optical system 40 from an oblique direction of the eye E, an index indicating a bright spot of corneal reflection is detected on the position detection element 48. The position of the index on the position detection element 48 changes depending on the positional relationship between the eye to be examined and the measurement unit 7 in the Z direction. By controlling the drive of the drive unit 9 so that the index falls within a predetermined tolerance range with respect to the reference position in the Z direction on the position detection element 48, the measurement unit 7 (objective measurement optical system 10, The alignment of the correction optical system 60) of the subjective measurement optical system 25 in the Z direction is adjusted.

In this embodiment, a configuration is taken as an example in which the alignment in the XYZ directions is adjusted by driving the deflection mirror 81 by the drive mechanism 82 and the drive unit 83, and moving the measurement unit 7 by the drive unit 9L and the drive unit 9R. Although the description has been given above, the invention is not limited thereto. Any configuration may be used as long as it is possible to adjust the positional relationship between the eye to be examined and the subjective measurement unit and the objective measurement unit. That is, any configuration may be used as long as the XYZ directions can be adjusted so that the image of the optotype corrected by the correction optical system 60 is formed on the fundus of the eye to be examined. For example, a structure may be provided in which the housing 2 in which the measurement unit 7 is arranged can be moved in the XYZ directions with respect to the jaw rest 6, and the housing 2 may be moved. In this case, it is preferable that a configuration is provided in which the left-eye deflection mirror 81L and the right-eye deflection mirror 81R are moved in the X direction, respectively. Thereby, the left and right directions of the optical axes of the measurement units 7L and 7R can be adjusted in accordance with the interpupillary distance of the subject. Further, for example, a configuration may be adopted in which adjustment in the XYZ directions can be performed only by the deflection mirror 81. In this case, for example, the deflection mirror 81 may be configured to be rotated and moved in the Z direction so that the distance between the deflection mirror 81 and the measurement unit 7 is changed.

Furthermore, even after the adjustment of the alignment in the XYZ directions is completed, the control unit 70 detects the positional relationship between the eye to be examined and the measurement unit 7 if the alignment state falls outside of a predetermined tolerance range. In this step, the driving portion 9, the driving mechanism 82, and the driving portion 83 are controlled so that the alignment state falls within the predetermined tolerance range again. That is, automatic tracking of alignment is executed.

<Objective eye refractive power measurement>
When the alignment for the eye E is completed, the control unit 70 issues a trigger signal to start objective eye refractive power measurement (objective measurement) based on the alignment completion signal. When a trigger signal for starting objective measurement is issued, the control unit 70 emits a measurement light beam from the objective measurement optical system 10. In this case, each measurement light beam is reflected by the concave mirror 85 via the deflection mirrors 81R and 81L, and then projected onto the fundus of the eye to be examined. The measurement light reflected from the fundus passes through the concave mirror 85, the deflection mirrors 81R and 81L, and measurement images are captured by the imaging elements 22 of the left and right measuring sections 7.

For example, in measuring the objective eye refractive power, a preliminary measurement of the eye refractive power is first performed, and the display 31 is moved in the optical axis L2 direction based on the result of the preliminary measurement, so that the eye to be examined E is A cloud may also be applied. Thereafter, the main measurement of the eye refractive power may be performed on the fogged eye. In this measurement, a measurement image is captured by the image sensor 22, and an output signal from the image sensor 22 is stored in the memory 75 as image data (measurement image). Thereafter, the control unit 70 analyzes the ring image stored in the memory 75 to determine the value of refractive power in each meridian direction. The control unit 70 performs a predetermined process on this refractive power to determine the objective eye refractive power (S (spherical power), C (astigmatic power), A (astigmatic axis angle) of the subject's eye during distance vision (others). Obtain the memory value). The obtained objective values during distance vision are stored in the memory 75.

Note that the measurement of the objective refractive power of the eye to be examined may be performed simultaneously for the left and right eyes to be examined, or may be performed for the left and right eyes to be examined separately. The measurement of the objective eye refractive power may be performed multiple times (for example, three times) for each of the left and right eyes, and the representative value thereof may be used in the subsequent measurement of the subjective eye refractive power.

<Subjective eye refractive power measurement>
After the objective eye refractive power measurement is completed, the examiner operates the controller 6 (in this embodiment, the display 6a also serves as the operation unit) and selects the subjective eye refractive power measurement mode. The state is ready for measurement.

FIG. 7 is an example of an operation screen 600 on the display 6a in the subjective eye refractive power measurement mode. The examiner operates the operation screen 600 to select the optotype to be presented to the subject's eye (the test optotype to be displayed on the display 31), and while obtaining a response from the subject regarding the visibility of the optotype, By changing the values of the correction amounts (spherical power S, astigmatic power C, astigmatic axis angle A, etc.) of the corrective optical system 60, a measured value of the subjective eye refractive power is obtained.

In the measurement screen 600, a right eye button 610R, a left eye button 610L, and a binocular selection button 610C for selecting measurement eyes are provided at the upper center of the screen. The window display 612R on the right side of the right eye button 610R and the window display 61L on the left side of the left eye button 610L indicate the shielding/opening state of the measuring eye, respectively, and indicate that the measuring eye is in the open state (no test target is presented). If the measuring eye is in a shielding state (a state where the test target is not presented), it is displayed as a white circle. In the example of FIG. 7, by selecting the right eye with the right eye button 610R, the right eye is in the open state and the left eye is in the shielded state.

A correction item selection field 614 is provided in the center of the screen for selecting an item of the amount of correction (also referred to as correction power) of the correction optical system 60. When the display "S" is selected, the amount of correction for the spherical power S can be changed, and when the display "C" is selected, the correction amount for the astigmatic power C can be changed, and the "A" ” is selected, the amount of correction of the astigmatic axis angle A can be changed. Each correction amount is increased or decreased in predetermined steps by pressing the plus switch 616a and the minus switch 616b. For example, the spherical power S and the astigmatic power C are increased or decreased by 0.25 D (dioptre), and the astigmatic axis angle A is increased or decreased by 5 degrees (or may be 1 degree).

The right eye correction amount display field 618R on the left side of the correction item selection field 614 displays the value of the right eye correction amount, and the left eye correction amount display field 618L on the right side of the correction item selection field 614 displays the value of the right eye correction amount display field 618R on the left side of the correction item selection field 614. The value of the eye correction amount is displayed. Then, in accordance with the selection of each correction item, the display portions of the values in the right eye correction amount display field 618R and the left eye correction amount display field 618L are displayed in reverse. In the example of FIG. 7, the spherical power S is selected as the correction item.

The right optotype display section 622R at the bottom left of the right eye correction amount display field 618R and the left optotype display section 622L at the bottom right of the left eye correction amount display field 618L each have a display 31 of the optotype projection optical system 30. The test optotype being presented is displayed. In the example of FIG. 7, a visual acuity value optotype is displayed. A desired test optotype presented on the display 31 can be selected from among the optotypes displayed in the optotype selection field 624. For example, the optotypes that can be selected in the optotype selection field 624 include, in addition to visual acuity value optotypes, red/green optotypes, point group optotypes used in astigmatism tests, and the like. When a visual acuity value optotype is selected, visual acuity value change buttons 626a and 626b are provided at the bottom right of the screen for changing the visual acuity value (test optotype having a size corresponding to the visual acuity value).

Further, a temporary frame inspection button 630 for shifting to temporary frame inspection mode is provided at the bottom center of the screen.

Return to the explanation of subjective eye refractive power measurement. For example, at the start of the subjective eye refractive power measurement, the control unit 70 controls the objective eye refractive power (spherical power S, astigmatic power C, astigmatic axis angle A) of the left and right subject eyes obtained in the objective eye refractive power measurement. Based on this, the left and right correction optical systems 60 are driven and initialized. Then, in the right eye correction amount display column 618R and the left eye correction amount display column 618L on the operation screen 600, the correction amounts set in the left and right correction optical systems 60 are displayed. In the subjective eye refractive power measurement, for example, after determining the fully corrected power of the right eye and the fully corrected power of the left eye, a measurement is performed to determine the power in binocular balance.

When the right eye button 610R on the operation screen 600 is selected to first measure the fully corrected power of the right eye, the optical path of the correction optical system 60 on the left eye side of the non-measuring eye is placed in a shielded state. For example, shielding on the non-measuring eye side is performed by turning off the display 31 that displays the optotype, and in addition, only the background of the optotype is displayed on the screen of the display 31 on the non-measuring eye side, and the test optotype is This may be done without being displayed.

In the measurement of completely corrected power, for example, the examiner selects red and green optotypes as test optotypes. The purpose of the red/green optotypes at this stage is to place the circle of least confusion at the retinal position for the next astigmatism measurement, and the optotypes with the red background and the green background are of the same degree. The examiner changes (adjusts) the spherical power S so that the object can be seen (or slightly better against the green background).

Next, the examiner selects a point cloud optotype for measuring the astigmatic axis angle A, and changes (adjusts) the astigmatic axis angle A so that the point cloud optotype can be seen more clearly. Next, in order to measure the astigmatism power C, the examiner changes (adjusts) the astigmatism power C so that the point group optotype can be seen more clearly while keeping the test optotype as a point group optotype. Next, the examiner selects the red/green optotype again as the test optotype, making sure that the optotype with the red background and the optotype with the green background are equally visible (or slightly better with the green background). ), the examiner changes (adjusts) the spherical power S. Measurement using red and green optotypes after astigmatism measurement is performed to prevent overcorrection.

Next, the examiner selects a visual acuity value optotype (for example, an optotype with a visual acuity value of 1.0), and measures (adjusts) the most positive spherical power S that provides the best visual acuity. Further, the examiner changes the visual acuity value of the visual acuity value optotype using visual acuity value change buttons 626a and 626b, and confirms the best visual acuity.

Once the examiner has obtained the fully corrected power of the right eye of the subject, the examiner similarly measures the fully corrected power of the left eye. After that, the examiner performs a binocular balance test, and adjusts the spherical power so that the way the visual acuity value target is seen by the subject's right eye and the visual acuity value target by the left eye are approximately equal. S, change (adjust) the astigmatic power C.

<Temporary frame inspection>
After the subjective eye refractive power measurement is completed, proceed to a temporary frame examination using a temporary frame. The examiner selects the temporary frame inspection mode by pressing the temporary frame inspection button 630 on the measurement screen 600. By pressing the temporary frame inspection button 630, a start signal for starting the temporary frame inspection is input.

When set to the temporary frame inspection mode, the control unit 70 changes the left and right correction optical systems 60 to a non-correction state based on the input temporary frame inspection start signal. That is, the control unit 70 drives the corrective optical system 60 so that the spherical power S and the astigmatic power C become zero values. In other words, the control unit 70 sets the state in which the correction optical system 60 is not performing correction of the eye to be examined. Then, a test optotype at a predetermined test distance (far distance) is presented to the eye to be examined without correction by the corrective optical system 60.

In addition, the control unit 70 changes the left and right correction optical systems 60 to a non-correction state based on the temporary frame inspection start signal, but the right eye correction amount display field 618R and the left eye correction amount display field 618L of the measurement screen 600. The correction amounts (values of spherical power S, astigmatic power C, and astigmatic axis angle A) are displayed at the values immediately before the start signal of the temporary frame inspection is input. That is, the final correction amount value in the subjective eye refractive power measurement remains displayed. This allows the examiner to know the value of the amount of correction obtained by subjective eye refraction measurement when setting the test lens TL in the lens frame of the temporary frame (temporary frame glasses) TF shown in FIG. The test lens TL can be appropriately set accordingly. Therefore, temporary frame inspection can be carried out smoothly. That is, when performing a temporary frame test by presenting the test target through the corrective optical system 60 to the eye to be examined, the correction amount of the corrective optical system 60 and the measurement screen 600 (correction amount display columns 618R, 618L) are If the correction optical system 60 is brought into a non-correction state while the display of the correction amount remains linked, the correction amount on the measurement screen 600 will also become zero. In this case, the value of the correction amount obtained by subjective eye refraction measurement cannot be known from the display on the display 6a, and it is necessary to record the correction amount by subjective eye refraction measurement, for example, in a memo or the like. This may be inconvenient for temporary frame inspection. The present disclosure alleviates this disadvantage.

Note that the examiner may be notified through a display on the measurement screen 600 that the measurement state of the subjective optometrist 1 has been set to the temporary frame inspection mode by pressing the temporary frame inspection button 630. For example, in the temporary frame inspection mode, the display color of the temporary frame inspection button 630 can be changed. Thereby, the examiner can recognize that the measurement state is in the temporary frame inspection mode, and can understand that even if an operation to change the correction amount is performed, the correction optical system 60 remains in the non-correction state. .

The examiner determines the amount of correction for the test lens while looking at the value of the amount of correction (refraction power) obtained by subjective eye refraction measurement, and sets the test lens TL in the temporary frame TF. The subject is asked to wear a temporary frame TF. Then, the examiner displays the visual acuity target on the display 31, and performs a temporary frame test to see how the visual target looks while the subject is wearing the temporary frame TF.

Here, when the start signal of the temporary frame inspection is input, the control unit 70 stops the automatic alignment operation of the measurement unit 7 (corrective optical system 60) with respect to the eye to be examined based on the start signal (substantially (including when it is stopped temporarily). For example, even if there is a detection signal from the image sensor 52 that detects the index of the first alignment index optical system 55 and a detection signal of the position detection element 48 that detects the index of the second alignment index optical system 40, By stopping the driving of the drive mechanism 82 and the drive unit 83 (OFF state), the automatic alignment operation is directly stopped. In this case, it may include disabling (OFF) the alignment state detection signal. Further, the control unit 70 may stop (not output) a signal for operating the drive mechanism 82 and the drive unit 83 even if there is an alignment state detection signal. Alternatively, the control unit 70 changes the alignment detection conditions when aligning the measurement unit 7 (corrective optical system 60) to the subject's eye during measurement so that automatic alignment does not operate. Good too. In this case, for example, the control unit 70 turns off the light sources (anterior segment illumination unit 95, light source 56, and light source 41) used for alignment (including the case of dimming), and turns off (including the case of dimming) the light sources used for alignment ( By preventing alignment light from being detected by the image sensor 52 and position detection element 48), the drive mechanism 82 and drive unit 83 are prevented from operating for the alignment operation. Alternatively, for example, the control unit 70 may prevent the output of the detection signals of the detection elements (from the image sensor 52 and the position detection element 48) used for alignment, thereby controlling the drive mechanism 82 and the drive unit for the alignment operation. 83 should not be active. In addition, any control that changes the alignment detection conditions so that automatic alignment is not activated may be used.

Furthermore, even if the automatic alignment operation is stopped during the temporary frame examination, the alignment adjustment for the subject's eye has been completed in the previous subjective eye refractive power measurement, so if this state is maintained, the subject's can visually recognize the test optotype through the correction optical system 60.

In this manner, during the temporary frame inspection, the automatic alignment operation during eye refractive power measurement by the corrective optical system 60 is stopped, so that the test lens TL of the temporary frame TF is positioned in front of the subject's eyes. This reduces the possibility of erroneous detection of the alignment state or erroneous operation of automatic tracking, allowing smooth inspection of the temporary frame. That is, when the test lens TL of the temporary frame TF is positioned in front of the subject's eyes, light from the light sources (anterior segment illumination unit 95, light source 56, and light source 41) used for alignment for eye refractive power measurement by the corrective optical system 60 The alignment light is reflected by the test lens TL. Then, the reflected light may not be properly detected by the detection elements (image sensor 52, position detection element 48), and may be detected as an indicator of an incorrect position or may cause an alignment error. On the other hand, by stopping the automatic alignment operation as described above, inconveniences in performing the temporary frame inspection can be avoided.

When the examiner changes the amount of correction (e.g., increases or decreases in the spherical power S, astigmatic power C, etc.) during the visual condition test using a temporary frame test, the examiner should use a conventional phoropter (for example, JP-A-5 176893), the correction amount values displayed on the operation screen 600 (right eye correction amount display field 618R, left eye correction amount display column 618R, left eye correction amount display column 618L). In this case as well, in the temporary frame inspection mode, the control unit 70 leaves the correction optical system 60 in the non-correction state. In other words, the control unit 70 maintains the non-correction state of the correction optical system 60. Thereby, there is no change in the presentation of the test optotype via the correction optical system 60, and the correction amount is changed only in the temporary frame TF, so that the temporary frame inspection can be performed smoothly.

Furthermore, the examiner can operate the controller 6 with the same feeling of using a conventional phoropter. That is, in the conventional temporary frame inspection using a phoropter, the phoropter is retracted from in front of the subject's eyes, and the temporary frame inspection is performed while presenting the test optotype through the test lens TL set in the temporary frame TF. In this case, the correction amount value of the controller is changed according to the correction amount of the test lens TL set in the temporary frame TF, and the correction amount of the phoropter's correction optical system is also changed in conjunction with this, but the phoropter is Since it is evacuated from right in front of the examiner, it does not affect the temporary frame examination. Also in the subjective optometry device 1 of the present disclosure, the correction optical system 60 remains in the non-correction state during the temporary frame inspection mode, so even if the displayed value of the amount of correction is changed, the temporary frame inspection cannot be performed. Not affected.

Once the final correction amount in the temporary frame inspection is determined, the printer 77 outputs the correction amount value for prescription of spectacle lenses by pressing the print switch 640. Further, the test results of the subjective eye refractive power measurement are recorded in the memory 75 in association with the ID number of the subject. As a result, the test results of the examinee can be appropriately managed in the same way as when using a conventional phoropter. Note that when the temporary frame inspection is completed and the temporary frame inspection button 630 is pressed again, the temporary frame inspection mode is exited and the original normal inspection mode is returned. At this time, the display color of the temporary frame inspection button 630 is changed to the original color. By changing this display, the examiner is notified that the normal examination mode has been returned.

<Transformation example>
Although typical embodiments of the present disclosure have been described above, the present disclosure is not limited to the embodiments shown here, and various modifications are possible.

For example, in the above embodiment, the astigmatism correcting optical system 63 and the spherical correction optical system (for example, the driving means 39) are separately provided as the correcting optical system. Not limited. For example, the corrective optical system may have any configuration as long as it can change the spherical power, the astigmatic power, and the astigmatic axis angle. For example, the corrective optical system may be an optical system that modulates the wavefront. Furthermore, for example, the corrective optical system may have a configuration in which a large number of optical elements (spherical lenses, cylindrical lenses, dispersion prisms, etc.) are arranged on the same circumference of a lens disk. In this case, the optical element desired by the examiner is placed on the optical axis L2 by controlling the rotation of the lens disk by a drive unit (actuator, etc.).

Further, by controlling the rotation of the optical element (for example, a cylindrical lens, cross cylinder lens, rotary prism, etc.) placed on the optical axis L2 by the drive unit, the optical element is rotated along the optical axis at a rotation angle desired by the examiner. It may be arranged in L2. Switching of the optical elements arranged on the optical axis L2, etc. may be performed by operating input means (operation means) such as the display 6a.

For example, the lens disc may consist of one lens disc or multiple lens discs. When a plurality of lens disks are arranged, a drive section corresponding to each lens disk is provided. For example, in a group of lens disks, each lens disk includes an aperture (or 0D lens) and a plurality of optical elements. Typical types of each lens disk include a spherical lens disk having a plurality of spherical lenses with different powers, a cylindrical lens disk having a plurality of cylindrical lenses having different powers, and an auxiliary lens disk having multiple types of auxiliary lenses. At least one of a red filter/green filter, a prism, a cross cylinder lens, a polarizing plate, a Maddox lens, and an autocross cylinder lens is arranged on the auxiliary lens disk. Further, the cylindrical lens may be arranged to be rotatable about the optical axis L2 by the drive unit, and the rotary prism and the cross cylinder lens may be arranged to be rotatable about the respective optical axes by the drive unit.

Regarding the display of the correction amount on the measurement screen 600 in the temporary frame inspection, in the above embodiment, when the start signal for starting the temporary frame inspection is input, the right eye correction amount display column 618R and the left eye correction Although the amount of correction in the amount display field 618L is displayed as the value immediately before the temporary frame inspection start signal is input, it is not limited to this. It is sufficient that the value immediately before the temporary frame inspection start signal is input is displayed on the display 6a. For example, as shown in FIG. 9, the displays in the right eye correction amount display field 618R and the left eye correction amount display field 618L are displayed in conjunction with the correction amount of the correction optical system 60, but the temporary frame inspection start signal is The value obtained in the subjective eye refraction measurement immediately before being input may be copied and displayed in display fields 568R and 658L, which are display areas different from the right eye correction amount display field 618R and the left eye correction amount display field 618L. good. Then, when the correction amount of the test lens TL is changed in the temporary frame inspection and the plus switch 616a and the minus switch 616b are operated, the values in the display columns 568R and 658L are changed.

Furthermore, in the above explanation, when the mode is shifted to the temporary frame inspection mode, even if the plus switch 616a and the minus switch 616b for finely adjusting the amount of correction are operated, the correction optical system 60 remains in the non-correction state. However, you can do it like this: That is, when the start signal for the temporary frame inspection is input, the correction optical system 60 is changed to the non-correction state, but when the plus switch 616a and the minus switch 616b are operated in the temporary frame inspection mode, the increase or decrease is changed. The correction amount of the correction optical system 60 may be changed accordingly. For example, if the spherical power S is changed to the plus side by 0.25D by the plus switch 616a, the amount of correction of the spherical power of the corrective optical system 60 is changed from 0D by +0.25D. Next, when the spherical power S is changed to the negative side by 0.25D by the minus switch 616b, the amount of correction of the spherical power of the corrective optical system 60 is returned to 0D. Thereby, comparison of the subject's visual appearance before and after changing the amount of correction can be easily performed by operating the subjective optometrist 1 side without replacing the test lens TL set in the temporary frame TF.

1 Subjective optometry device 6a Display 30 Target projection optical system 40 Second alignment index optical system 50 Observation optical system 55 First alignment index optical system 60 Correction optical system 70 Control unit 80 Light guide optical system 600 Measurement screen 614 Correction items Selection field 614
616a Plus switch 616b Minus switch 618R Right eye correction amount display field 618L Left eye correction amount display field 630 Temporary frame inspection button

Claims (5)

an optotype projection optical system for projecting the optotype light flux onto the eye to be examined;
a correction optical system that is disposed in the optical path of the optotype projecting optical system and changes the amount of correction of refractive power imparted to the eye to be examined;
a light guide optical system that optically guides the image of the optotype light flux through the correction optical system to the eye to be examined so as to be at a predetermined inspection distance;
A subjective optometry device that subjectively measures the optical characteristics of the subject's eye with the subject's eyes open in front of the subject,
measurement control means for changing the correction optical system to a non-correction state based on a start signal for starting a temporary frame inspection using a temporary frame;
A subjective optometry device characterized by comprising: The subjective optometry device according to claim 1,
automatic alignment means for detecting an alignment state of the corrective optical system with respect to the eye to be examined, and automatically aligning the corrective optical system with respect to the eye to be examined based on the detection;
stopping means for stopping the operation of the automatic alignment means based on the start signal;
A subjective optometry device characterized by comprising: The subjective optometry device according to claim 2,
The stopping means includes a first stopping means for directly stopping the operation of the automatic alignment means, and a first stopping means for directly stopping the operation of the automatic alignment means, and a first stopping means for directly stopping the operation of the automatic alignment means, and a first stop means for directly stopping the operation of the automatic alignment means. A subjective optometry device comprising any one of the following: second stopping means for changing the detection condition so that the alignment means does not operate. In the subjective optometry device according to any one of claims 1 to 3,
Display means for displaying the value of the amount of correction measured by the correction optical system;
Display control means for controlling the display means,
The display control means is configured to display the correction amount measured by the correction optical system immediately before the input of the start signal even when the correction optical system is changed to a non-correction state based on the start signal of the temporary frame inspection. A subjective optometry device characterized in that a value is displayed on the display means. The subjective optometry device according to claim 4,
comprising a changing means for changing the value of the correction amount displayed on the display means,
The subjective optometry apparatus is characterized in that the measurement control means maintains the non-correction state of the correction optical system even when the value of the correction amount is changed by the change means.