JP2013081518A - Ophthalmic equipment - Google Patents

Abstract

An ophthalmologic apparatus capable of shortening measurement time is provided.
An optometry unit that examines or measures an eye to be examined, X, Y, Z motors 400 to 402 that move the optometry unit back and forth and up and down, and a position detection unit that measures the position of the optometry unit. 304A, blink detection means 304B for detecting blink of the eye to be examined, arithmetic control device 304 for controlling the X, Y, Z motors 400 to 402 based on the measurement position measured by the position detection means 304A and the alignment completion position; When the blink detection unit 304B does not detect blinks, the arithmetic and control unit 304 controls the X, Y, Z motors 400 to 402 based on the measurement result of the position detection unit 304A to align the optometry unit. An ophthalmologic apparatus that moves toward a completion position, and the arithmetic and control unit 304 detects the position immediately before the blink detection unit 304B detects the blink. Based on the measurement data of the stage 304A X, Y, to move the ophthalmic examination unit by controlling the Z motor 400-402.
[Selection] Figure 6

Description

  The present invention relates to an ophthalmologic apparatus including an optometry unit that is movable back and forth and up and down with respect to an eye to be examined.

  2. Description of the Related Art Conventionally, an ophthalmologic apparatus is known that performs alignment by moving a measurement unit back and forth and up and down with respect to an eye to be examined (see Patent Document 1).

  Such an ophthalmologic apparatus includes an observation / imaging optical system for observing and photographing the fundus, an alignment detection means for detecting alignment of the observation / imaging optical system for the eye to be examined, a blink detection means for detecting blink of the eye to be examined, and the like. ing.

  In such an ophthalmologic apparatus, after the completion of alignment is detected by the alignment detection unit, the fundus is imaged by the observation / imaging optical system when the blink detection unit does not detect blinking.

Japanese Patent No. 4557359

  By the way, an ophthalmic apparatus that includes blink detection means and performs alignment by auto-alignment has been proposed. In such an ophthalmologic apparatus, when the blink detection means detects blink during auto-alignment, the movement of the measurement unit is stopped and blinking is performed. When it is no longer detected, alignment is performed by moving the measurement unit again. For this reason, there was a problem that the measurement time becomes long.

  An object of the present invention is to provide an ophthalmologic apparatus that can shorten the measurement time.

The invention of claim 1 includes an optometry unit that can move back and forth and up and down with respect to the eye to be examined, and that inspects or measures the eye to be examined, a moving means that moves the optometry unit back and forth and up and down, and the subject. Based on the position detection means for measuring the position of the optometry part relative to the optometry, the blink detection means for detecting blink of the eye to be examined, the measurement position measured by the position detection means, and the alignment completion position for the eye to be examined Control means for controlling the movement means, the position detection means measures the position of the optometry unit at regular time intervals, and when the blink detection means does not detect blinks, the control means An ophthalmologic apparatus that moves an optometric unit toward the alignment completion position by controlling a moving unit based on a measurement result,
When the blink detecting unit detects blinking, the control unit controls the moving unit based on the measurement data of the position detecting unit immediately before detecting the blink, and moves the optometry unit. To do.

  According to this invention, since the measurement unit is moved even when the blink detection means detects blinks, the measurement time can be shortened.

(A) is the left view which showed the external view of the ophthalmologic apparatus based on this invention, (B) is a front view. (A) is the left view of the ophthalmologic apparatus which showed the state which mounted the display part on the optometry part, (B) is a front view. It is a right view of the ophthalmologic apparatus shown in FIG. It is the top view which showed arrangement | positioning of the optical system of an ophthalmologic apparatus. It is the side view which showed arrangement | positioning of the optical system of an ophthalmologic apparatus. It is the block diagram which showed the structure of the control system of an ophthalmologic apparatus. It is the flowchart which showed operation | movement of the control system of the ophthalmologic apparatus. It is explanatory drawing which showed the anterior eye part image displayed on the display part of an ophthalmologic apparatus.

  Hereinafter, an embodiment which is an embodiment of an ophthalmologic apparatus according to the present invention will be described with reference to the drawings.

  1 to 3, reference numeral 1 denotes an ophthalmologic apparatus. The ophthalmologic apparatus 1 includes a base unit 2 provided on a base K, an optometry unit (measuring unit) 3, a chin support unit 4, and a display unit 10. The chin receiving part 4 is provided with a forehead receiving part 5 integrally therewith.

  An intraocular pressure measurement system 200 is provided inside the optometry unit 3 as indicated by a broken line.

  The optometry unit 3 is driven in the up / down / left / right and front / rear directions with respect to the eye to be examined. In other words, the optometry unit 3 is movable in the up / down / left / right / front / rear direction with respect to the face of the subject fixed to the chin rest 4.

  The display unit 10 displays the anterior segment of the subject during measurement and examination.

The display unit 10 can be freely moved to a desired position, as shown in FIGS. In addition, a touch panel 302 (see FIG. 6) is attached to the screen of the display unit 10, and by touching the touch panel 302, the optometry unit 3 is moved in the front-rear direction and the up-down direction with respect to the eye to be examined. In addition to being able to perform various operations.
[Intraocular pressure measurement system]
As shown in FIGS. 4 and 5, the intraocular pressure measurement system 200 includes an anterior ocular segment observation optical system 210, an XY alignment target projection optical system 220, a fixation target projection optical system 230, and an XY alignment detection optical system. 240, a corneal deformation detection optical system 250, a slit projection optical system 260, a Z alignment light receiving optical system 270, and a Z alignment projection optical system 280.

  As shown in FIG. 4, the anterior ocular segment observation optical system 210 includes an anterior ocular segment illumination light source 211 provided in front of the optometry unit 3 (see FIG. 1), an anterior ocular window glass 213, and an airflow spray nozzle 212. And a chamber glass 214, a half mirror 215, an objective lens 216, half mirrors 217 and 218, and an image sensor (light receiving means) 219 such as a CCD. The airflow spray nozzle 212 sprays the air compressed by the air ejection device 310 (see FIG. 6) toward the eye E.

  As shown in FIG. 5, the XY alignment target projection optical system 220 includes an alignment light source 221 for emitting infrared light, a condenser lens 222, an aperture stop 223, a pinhole plate 224, a dichroic mirror 225, The projection lens 226, the half mirror 215, the chamber glass 214, and the airflow spray nozzle 212 are provided. The dichroic mirror 225 reflects infrared light and transmits visible light.

  The fixation target projection optical system 230 includes a fixation target light source (notification means) 231, a pinhole plate 232, a dichroic mirror 225, a projection lens 226, a half mirror 215, a chamber glass 214, and an airflow spray nozzle 212. And have.

  The XY alignment detection optical system 240 includes an airflow blowing nozzle 212, a chamber glass 214, a half mirror 215, an objective lens 216, half mirrors 217 and 218, and a light receiving sensor 241. The light receiving sensor (area sensor) 241 includes a position sensor that can detect the position of the image formation point.

  The corneal deformation detection optical system 250 includes an airflow spray nozzle 212, a chamber glass 214, a half mirror 215, an objective lens 216, a half mirror 217, a pinhole plate 251, and a light receiving sensor 252.

  As shown in FIG. 4, the slit projection optical system 260 includes a slit light source 261 that emits infrared light, a condenser lens 262, a slit 263, a rectangular aperture stop 264, a half mirror 285, and a projection lens 265. Have.

  The Z alignment light receiving optical system 270 includes an imaging lens 271 and a line sensor 272.

The Z alignment projection optical system 280 includes an alignment light source 281 that emits infrared light, a condenser lens 282, an aperture stop 283, a pinhole plate 284, a half mirror 285, and a projection lens 265. .
[Control system]
FIG. 6 is a block diagram showing the configuration of the control system of the ophthalmologic apparatus 1. Reference numeral 219 denotes an image sensor on which an anterior ocular segment image is formed. The anterior ocular segment image formed on the image sensor is displayed. Displayed on the unit 10. Reference numeral 400 denotes an X motor (moving means) that moves the optometry unit 3 in the X direction (left and right direction with respect to the eye E). Y motor (moving means) that is a pulse motor that moves in the direction (direction), and 402 is a Z motor (moving means) that is a pulse motor that moves the optometry unit 3 in the Z direction (front-back direction with respect to the eye E). .

  304 is an arithmetic control device (control) that controls setting of various measurement modes, lighting of the light sources 211, 221, 231, 261, and 281 based on the operation of the touch panel 302, and driving of the air ejection device 310. Means). The arithmetic and control unit 304 obtains intraocular pressure based on the pressure of the air pulse ejected by the air ejecting device 310, the amount of light received by the light receiving sensor 252, and the like.

In addition, the arithmetic and control unit 304 determines the position of the optometry unit 3 in the X and Y directions with respect to the eye E from the position of the imaging point on the light receiving sensor 241 and the bright spot image Q on the line sensor 272 (see FIG. 4). The function of the position detecting means 304A that obtains the position in the Z direction from the current position at regular time intervals and the blink detecting means 304B that detects the blink from the positional information in the X, Y, and Z directions obtained at regular time intervals. It has the function of.
[Operation]
Next, the operation of the ophthalmologic apparatus 1 configured as described above will be described with reference to the flowchart shown in FIG.

  First, a power switch (not shown) is turned on. When the power switch is turned on, the anterior segment illumination light source 211 is turned on, and the anterior segment of the eye E is illuminated.

  When measuring intraocular pressure, the touch panel 302 of the display unit is operated to set an intraocular pressure measurement mode.

  The anterior segment image of the subject eye E illuminated by the anterior segment illumination light source 211 passes through the inside and outside of the airflow spray nozzle 212, passes through the anterior segment window glass 213, the chamber glass 214, and the half mirror 215, and the objective lens 216. Is formed on the image sensor 219 while passing through the half mirrors 217 and 218 while being focused. Then, the anterior segment image Ef is displayed on the display unit 10 as shown in FIG.

  On the other hand, the alignment light source 221 of the XY alignment target projection optical system 220, the alignment light source 281 of the Z alignment projection optical system 280, and the fixation target light source 231 of the fixation target projection optical system 230 are turned on. The light passes through the pinhole plate 232, the dichroic mirror 225, the projection lens 226, the half mirror 215, the chamber glass 214, and the nozzle 212 and is projected onto the fundus Er of the eye E, and the eye E is fixed. Further, infrared light is emitted from the alignment light source 281 of the Z alignment projection optical system 280 shown in FIG. 4, and this infrared light is condensed on the condenser lens 282 and reaches the aperture stop 283. Part of the infrared light that has passed through the aperture stop 283 passes through the pinhole plate 284, is reflected by the half mirror 285, and is projected onto the cornea Ec by the projection lens 265.

  The infrared light is reflected by the cornea Ec, and the reflected light is reflected by the imaging lens 271 to form a bright spot image Q on the light receiving surface of the line sensor 272. Based on the bright spot image Q, the position of the optometry unit 3 in the Z direction (front-rear direction) with respect to the cornea Ec can be obtained.

  The examiner performs rough alignment by operating the touch panel 302 while observing the anterior segment image Ef displayed on the display unit 10. In other words, the touch portions 302a and 302b of the touch panel 302 are touch-operated so that the pupil Ea of the anterior eye portion image Ef is substantially at the center of the screen. By this operation, the arithmetic and control unit 304 drives the X and Y motors 400 and 401 to move the optometry unit 3 left and right and up and down.

  When the rough alignment is performed, the infrared light emitted from the alignment light source 221 of the XY alignment target projection optical system 220 shown in FIG. 5 passes through the aperture stop 223 while being focused by the condenser lens 222, and a pinhole. Guided to plate 224. The light beam that has passed through the pinhole plate 224 is reflected by the dichroic mirror 225, converted into a parallel light beam by the projection lens 226, reflected by the half mirror 215, and then transmitted through the chamber glass 214 to the inside of the airflow spray nozzle 212. , XY alignment index light is formed and projected onto the cornea Ec.

  This XY alignment index light is reflected by the surface of the cornea Ec, and this reflected light beam passes through the inside of the nozzle 212, passes through the chamber glass 214 and the half mirror 215, is focused by the objective lens 216, and part thereof by the half mirror 217. Is transmitted, and a part thereof is reflected by the half mirror 218. The light beam reflected by the half mirror 218 forms a bright spot image T 1 on the light receiving sensor 241.

  Further, the reflected light beam transmitted through the half mirror 218 forms a bright spot image T2 on the light receiving surface of the image sensor 219. With this bright spot image T2, the bright spot image T is displayed on the anterior segment image Ef on the display unit 10 as shown in FIG.

  The examiner touches the touch portions 302a and 302b of the touch panel 302 again so that the bright spot image T moves to the center of the pupil image Ea displayed on the display unit 10. By this operation, the arithmetic and control unit 304 drives the X and Y motors 400 and 401, and the optometry unit 3 moves left and right and up and down.

  The display unit 10 has a scale (not shown) indicating the Z direction (front-rear direction) of the optometry unit 3 with respect to the cornea Ec, and an optometry unit mark (not shown) indicating the position of the optometry unit 3 on the scale. ) And an alignment mark (not shown) indicating the alignment region in the Z direction on the scale is displayed, and the touch part (not shown) of the touch panel 302 is touched so that the optometry part mark enters the alignment mark. To do. By this operation, the arithmetic and control unit 304 drives the Z motor 402, and the optometry unit 3 moves back and forth.

  When the bright spot image T enters the predetermined area of the pupil image Ea, that is, the bright spot image T1 enters the precision alignment area, and the optometry mark on the scale enters the alignment mark, the alignment light source 281 is turned off, the slit light source 261 of the slit projection optical system 260 is turned on to emit infrared light, and this infrared light is collected by the condenser lens 262 and guided to the slit 263, and passes through the slit 263. Infrared light (slit beam L) passes through the rectangular aperture stop 264 and the half mirror 285 and is projected onto the cornea Ec by the projection lens 265. The slit light beam L projected on the cornea Ec is reflected by the cornea.

  The corneal reflected light of the slit light beam L is collected by the imaging lens 271 and imaged on the line sensor 272. From the difference between the peak value of the light amount distribution of the line sensor 272 and the reference position (Z alignment completion position) of the line sensor 272, the position of the optometry unit 3 in the Z direction can be determined accurately.

  Then, the arithmetic and control unit 304 executes each process according to the process flow of the flowchart shown in FIG. In this embodiment, for example, the position of X, Y, Z of the optometry unit 3 is measured every 33 msec, the movement direction and the movement speed of the optometry unit 3 are obtained, and the X, Y, Z motors 400 to 402 are driven and controlled. By doing so, the optometry unit 3 is moved in the moving direction at the calculated moving speed.

  In step 1, based on the detection result of the bright spot image T1 by the light receiving sensor 241, the arithmetic control unit 304 calculates and determines the position of the optometry unit 3 in the XY direction with respect to the cornea Ec. Further, the arithmetic and control unit 304 obtains the position of the optometry unit 3 in the Z direction with respect to the cornea Ec based on the bright spot image Q formed on the light receiving surface of the line sensor 272.

  That is, in step 1, the X, Y, and Z positions of the optometry unit 3 with respect to the cornea Ec of the eye E are measured.

  In step 2, it is determined whether or not the subject is blinking. This determination is made when, for example, a measurement error occurs at the X, Y, Z position or when the difference between the measured X, Y, Z position and the previously measured X, Y, Z position is greater than a predetermined value. Judge that you are doing.

  If it is determined yes in step 2, that is, if it is determined that the subject is blinking, the process proceeds to step 5, and if it is determined no, the process proceeds to step 3.

  In step 3, it is determined whether or not the alignment is completed based on the X, Y, and Z positions measured in step 1. If it is determined no, the process proceeds to step 6.

  In step 6, the arithmetic control unit 304 obtains the movement direction and movement speed of the optometry unit 3 based on the measurement data obtained in step 1, and controls the XYZ motors 400 to 402 to move the optometry unit 3 in the movement direction. Move at the speed determined. And it returns to step 1.

  If it is determined in step 2 that blinking has been performed and the process proceeds to step 5, in step 5, the optometry unit 3 is continuously moved with the movement direction and movement speed obtained based on the previously measured measurement data. And it returns to step 1.

  Until the bag is opened, the processes of Step 1, Step 2, and Step 5 are repeated. In the process of step 5 in this case, the optometry unit 3 is moved using data immediately before it is determined that blinking is performed.

  When the eyelid opens, it is determined NO in step 2, and the process proceeds to step 3 and the processing operations of step 1 to step 3 and step 6 are repeated until alignment is completed.

  When the alignment is completed, it is determined as YES in step 3 and the process proceeds to step 4.

  In step 4, since the alignment is completed, the movement of the optometry unit 3 is stopped and the measurement is executed. That is, the arithmetic control device 304 drives the air ejection device 310 to perform intraocular pressure measurement.

  As described above, when blinking is performed, the optometry unit 3 is not stopped, and the optometry unit is based on the measurement data measured immediately before in step 5 (data immediately before blinking is determined). Since 3 is continuously moved, it does not take a long time until the alignment is completed, and the measurement time can be shortened.

  By the way, at the moment when the eyelid is opened, the pupil is also lifted upward and becomes an unstable state in which the pupil cannot be lowered. Therefore, when the blink is detected and the process proceeds to step 5, the process goes from step 2 to step 3 in the next and subsequent loops. When advanced (that is, when the eyelid is opened), in step 6, the movement of the optometry unit 3 in the Y direction may be stopped for a predetermined time from the moment the eyelid is opened.

  In addition, when the completion of alignment is expected during the movement of the optometry unit 3 in step 5, the movement of the optometry unit 3 may be stopped. Further, when the blinking state continues for about 2 seconds or more, it may be determined that the eyelid is in a lowered state, and the execution of alignment may be stopped immediately.

  In the above embodiment, the tonometer has been described, but another ophthalmologic apparatus requiring alignment may be used. Further, although the optometric unit 3 is moved in the front-rear direction by operating the touch panel, it may be operated by operating a joystick (operating unit) or another operating unit (operating unit).

  In the present invention, design changes and additions are permitted without departing from the gist of the invention according to each claim of the claims.

DESCRIPTION OF SYMBOLS 1 Ophthalmology apparatus 3 Optometrist part 304 Operation control apparatus (control means)
304A Position detection means 304B Blink detection means 400 X motor (moving means)
401 Y motor (moving means)
402 Z motor (moving means)

Claims (3)

An optometry unit that can move back and forth and up and down with respect to the eye to be examined and that performs inspection or measurement of the eye to be examined, a moving means that moves the optometry part back and forth and up and down, and a position of the optometry unit with respect to the eye to be examined Position detecting means for measuring the eye, blink detecting means for detecting blink of the eye to be examined, control means for controlling the moving means based on the measurement position measured by the position detecting means and the alignment completion position with respect to the eye to be examined The position detection means measures the position of the optometry unit at regular time intervals, and when the blink detection means does not detect blinks, the control means moves based on the measurement result An ophthalmologic apparatus that moves the optometry unit toward the alignment completion position by controlling
When the blink detecting unit detects blinking, the control unit controls the moving unit based on the measurement data of the position detecting unit immediately before detecting the blink, and moves the optometry unit. Ophthalmic equipment.   2. The ophthalmologic apparatus according to claim 1, wherein when the blink detection unit detects blinking, movement of the optometry unit in the vertical direction is stopped for a predetermined time from the detection.   When the optometry unit is moved based on measurement data immediately before the blink is detected, the movement of the optometry unit is stopped when there is a possibility that the optometry unit is moved to the alignment completion position by this movement. The ophthalmic apparatus according to claim 1 or 2.