JP4136096B2 - Ophthalmic equipment - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an ophthalmologic apparatus having alignment means for aligning an eye to be examined and an optometry means when measuring a characteristic value of the eye to be examined.
[0002]
[Prior art]
Conventionally, this type of ophthalmologic apparatus projects an index for alignment onto the cornea, and detects the position and image intensity of the reflected image, thereby aligning the eye to be examined and the optometry apparatus in advance. The measurement is started after the positional relationship between the eye to be examined and the optometry apparatus is reached.
[0003]
Further, in order to adjust the positional relationship between the optometry apparatus and the eye to be inspected, until the projection index image is within the detection range of the position detector, the optometry apparatus is roughly aligned by the examiner's operation, and this projection index image is temporarily set. Is within the detection range of the position detector, the optometry apparatus automatically fine-tunes the alignment, maintains the positional relationship between the eye to be examined and the optometry apparatus, and starts measurement.
[0004]
[Problems to be solved by the invention]
However, in the above-described conventional example, until the projected index image is within the detection range of the position detector, rough alignment by the operation of the examiner is required, and the optometry apparatus is unmanned and fully automated. Has a problem.
[0005]
In addition, in order to detect the position of the eye to be examined in a wide range, it is necessary to additionally arrange a projection index optical system and a position detector for special position detection, the structure of the optometry apparatus becomes complicated, and the cost is high. Become.
[0006]
Furthermore, if position detection of the eye to be examined in a wide range is performed using the observation optical system of the eye to be examined and an index image projected onto the eye cornea to be examined, it is necessary to increase the imaging magnification of the eye and widen the range in which the eye is imaged There is a possibility that the detection accuracy and the alignment accuracy are lowered.
[0007]
An object of the present invention is to provide an ophthalmic apparatus capable of solving the above-described problems and performing accurate positioning quickly and easily.
[0008]
[Means for Solving the Problems]
An ophthalmologic apparatus according to the present invention for achieving the above object is provided with a projection light source for projecting an alignment mark onto the eye to be examined along the measurement optical axis of the optometry means, and an outer side and an inner side around the measurement optical axis, respectively. A pair of two light sources, and a plurality of pairs of the light sources arranged on the diagonal of the measurement optical axis , and reflection of the alignment mark and the anterior eye illumination light source on the eye to be examined A light receiving optical system for guiding a light beam to the light receiving means, a moving means for moving the optometry unit at least in the vertical and horizontal directions with respect to the eye to be examined, and moving the optometry unit based on an image captured by the light receiving means, a measurement optical axis and a control means for performing positioning between the subject's eye, the control unit, when the alignment mark is not received in a predetermined position of said light receiving means, and wherein all light sources pairs When all the reflected light beams are not captured in the image, the pair of light sources located on the diagonal are sequentially turned on and off, and the eye to be examined by the pair of light sources on the image captured by the light receiving means By comparing the magnitudes of the reflected light fluxes in the light source, which light source pair is lit is identified, and the measurement optical axis and the eye to be examined are aligned based on the identification result And
[0010]
DETAILED DESCRIPTION OF THE INVENTION
The present invention will be described in detail based on the embodiments shown in the drawings.
FIG. 1 shows a configuration diagram of an optometry apparatus according to a first embodiment. A main body 1 is provided with a forehead support member 2 on which a subject abuts a forehead and a forehead rest 3 on which a chin is placed. . In addition, observation windows 4R and 4L for measurement as shown in FIG. 2 are provided on the front surface of the main body 1 so that the nose of the subject does not come into contact with the device when looking inside. A concave depression 1a is provided for avoiding this.
[0011]
Inside the viewing windows 4R and 4L of the main body 1 is provided an optometry unit 5 that can be three-dimensionally aligned with the subject by a driving mechanism described later. A joint member 6 having a feed nut is provided on the bottom surface of the optometry unit 5 and is screwed to the feed screw rod 7. A longitudinal drive motor 9 is fixed to the stage table 8 for forward / backward movement that supports the feed screw rod 7, and its output shaft 9 a is connected to one end 7 a of the feed screw rod 7 by a joint member 10.
[0012]
A joint member 11 having a feed nut portion 11a is fixed in the vertical direction on the lower surface of the stage table 8 for longitudinal movement, and a feed screw rod 12 is screwed. The output shaft 14 a of the vertical drive motor 14 fixed to the vertical movement stage base 13 is connected to one end 12 a of the feed screw rod 12 by a joint member 15. Further, in the gap between the vertical movement stage base 13 and the joint member 11, a compression spring for reducing the load on the vertical drive motor 14 due to the weight of the optometry unit 5, the longitudinal movement stage base 8, the joint member 11, and the like. 16 is provided. Further, a guide dedication 17 is suspended from the lower surface of the stage table 8 for back and forth movement. The guide unit 17 is fitted into a guide groove 13 a provided in a part of the stage table 13 for vertical movement, and the optometry unit is rotated by the rotation of the vertical drive motor 14. 5 and the stage table 8 for back and forth movement are prevented from rotating.
[0013]
A horizontal movement stage base 18 is connected to the lower side of the vertical movement stage base 13, and guide portions 18 a and 18 b for inserting the guide bars 19 and 20 and a feed screw bar 21 on the lower surface of the horizontal movement stage base 18. A feed nut portion 18c to be screwed is provided. The guide rods 19 and 20 and the feed screw rod 21 are parallel to the eye width direction of the eye E and are fixed to the mounting portion 22a of the base 22, and the feed screw rod 21 is connected to a left-right drive motor (not shown). The left-right drive motor is fixed to the mounting portion 22 a of the base 22. That is, the optometry unit 5 can be driven three-dimensionally with respect to the eye E by rotation of the front-rear direction drive motor 9, the vertical direction drive motor 14, and the left-right direction drive motor, and the eye E can be aligned. It is said that.
[0014]
A chin rest support 23 is provided on the lower surface of the chin rest 3 on which the subject places his chin, and a screw portion 23 a for vertical driving is provided inside the chin rest support 23. Are combined. The drive motor 25 is fixed to the base 22 via a mounting plate 27, and the lower end portion 24 a of the screw rod 24 and the output shaft 25 a of the drive motor 25 are connected by a joint member 26. The height of the chin rest 3 can be adjusted by the driving force of the driving motor 25.
[0015]
Further, at the rear of the main body 1, there are an operation panel 28, a track ball 29 for operating the optometry unit 5 up and down, left and right, and a front and rear roller 30 formed with a knurling for anti-slip operation. Is provided. A monitor case 31 is provided in the main body 1 and a display device 32 such as a liquid crystal monitor is stored therein. The anterior eye image of the eye E to be examined, the measurement result, the apex distance, automatic / Measurement conditions such as manual are displayed. A fulcrum shaft 31a that fits into a hole (not shown) of the main body 1 is formed on the side surface of the monitor case 31, and the monitor case 31 is tilted about the fulcrum shaft 31a in the direction of the arrow to It can be fixed at an easily viewable position.
[0016]
Further, a power source 33 for supplying power, a printer 34, each switch, and a control means 35 for controlling device signals are incorporated in the lower part of the main body 1.
[0017]
FIG. 3 is a plan view of the operation panel unit 28. In addition to the trackball 29 and the front and rear rollers 30, the operation panel unit 28 includes a start switch 28a for starting measurement, and a measurement result to the printer 34. Print switch 28b for output, selection switch 28c that can select either automatic measurement or manual measurement for the measurement of the eye refractometer, and the measurement result of the eye E to prescribe the distance between the apex between the wearing glasses and the cornea In the case of prescription glasses, there are provided an apex distance selection switch 28d for enabling selection of 12 mm or 13.5 mm, and switches 28e and 28f for driving the chin rest 3 up and down. The chin rest 3 is raised by pushing and the chin rest 3 is lowered by pushing the switch 28f.
[0018]
By operating the trackball 29 so that the examiner rolls with his / her palm, a sensor (not shown) detects the amount of rotation of the trackball 29 in the front-rear and left-right directions. The control means 35 drives the vertical drive motor 14 and the horizontal drive motor described above to move the optometry unit 5 so as to move up and down and left and right with respect to the eye E. Further, the rotation amount of the front / rear roller 30 is detected by a sensor (not shown), and the front / rear direction drive motor 9 is driven according to the rotation amount to move the optometry unit 5 in the front / rear direction with respect to the eye E.
[0019]
FIG. 4 shows the optical system of the optometry unit 5 when the subject looks into the sight glass 4R with the right eye E, and the optometry unit 5 is arranged behind the sight glass 4R. The optometry unit 5 includes an eye refractive optical system 40r for measuring the eye refractive power of the eye E, an index image projected on the eye E for alignment of the eye E, and an iris image of the eye E. An anterior ocular segment observation optical system 40t, and a fixation target optical system 40f for projecting a fixation target to be presented to the eye E. The optical axes of these optical systems are the measurement optical axes of the optometry unit 5. 40L is identically coupled immediately before the eye E to be examined.
[0020]
On the eye refraction optical system 40r of the eye E, toward the viewing window 4R, the fundus index light source 41, the lens 42, the projection aperture 43, the perforated mirror 44, the light splitting member 45, the objective lens 46, and the light splitting member 47. The protective glass 48 is sequentially arranged. In addition, anterior eye illumination light sources 49a to 49d made of LEDs for illuminating the eye E are arranged around the measurement optical axis 40L as shown in FIG.
[0021]
The anterior ocular segment observation optical system 40t positioned in the reflection direction of the light splitting member 47 includes a projection light source composed of LEDs that are located at the focal points of the lens 50, the half mirror 50, and the lens 51 and emit the same wavelength as the anterior ocular segment illumination light source 49. 52 are sequentially arranged, and a two-dimensional imaging element 53 having a lens 52 and an imaging surface 53 a is arranged on the optical path reflected by the half mirror 51. Further, on the fixation target optical system 40f incident on the light splitting member 45, a target film 57 in which a light source 54, an infrared absorption filter 55 and a diffusion plate 56 are laminated, a moving lens 58, a lens 59, and a mirror 60 are sequentially provided. Has been placed. In addition, in the reflection direction of the perforated mirror 44, a diaphragm 61 shown in FIG. 6, a prism 62 shown in FIG. 7, an imaging lens 63, and a two-dimensional imaging device 64 having an imaging surface 64a are sequentially arranged.
[0022]
FIG. 8 is a block circuit diagram for controlling the optometry apparatus. The control means 35 for controlling the operation of the optometry apparatus includes a microprocessor (not shown), a ROM storing a program, and an interface of peripheral devices. A face index light source 41, a light source 54, anterior eye illumination light sources 49a to 49d, a drive motor for driving the moving lens 58, a front-rear direction drive motor 9, a vertical direction drive motor 14, a left-right direction A drive motor, a printer 34, a drive motor 25, and an operation panel 28 are connected. The two-dimensional image sensor 64 for measuring eye refractive power and the two-dimensional image sensor 53 for capturing an anterior segment image of the eye E are respectively connected via A / D converters 71 and 72 and frame memories 73 and 74, respectively. It is connected to the control means 35.
[0023]
When the subject abuts the forehead against the forehead support member 2 and looks into the viewing window 4R, the examiner checks whether the position of the eye of the subject is substantially on the center line of the viewing window 4R from the side. After confirming the above, the chin rest 3 is moved up and down by operating the switches 28e and 28f so that the forehead of the subject is stabilized, and the subject's chin is placed on the chin rest 3.
[0024]
When the light source 54 is turned on, the luminous flux illuminates the target film 57 in which the infrared absorption filter 55 and the diffusion plate 56 are laminated. On the target film 57, an image of a target that is fixed to the eye E is drawn, and the light beam emitted from the target film 57 passes through the moving lens 58 and the lens 59, and the mirror 60 and the light dividing member 45. And passes through the objective lens 46, the light splitting member 47, the protective glass 48, and the viewing window 4R, and presents the fixation target to the eye E to be examined. At this time, the moving lens 58 is moved back and forth in the optical axis direction by a drive mechanism (not shown) so as to cloud the fixation target by the target film 57 presented to the subject.
[0025]
The examiner selects either automatic or manual measurement of the eye refractive power by the selection switch 28c. When the examiner selects manual measurement using the selection switch 28c, “Manu.” Is displayed on the monitor screen 32a of the display device 32 as shown in FIG. After confirming this display, the examiner operates the track ball 29 and the front and rear rollers 30 described above, emits light from the projection light source 52 and is reflected by the cornea Ec of the eye E to be examined, within the alignment mark Ma on the monitor screen 32a. The optometry unit 5 is aligned so that the corneal reflection luminescent spot image Tc is incident.
[0026]
FIG. 10 shows an anterior eye image of the eye E projected on the imaging surface 53a of the two-dimensional image sensor 53 of the anterior eye observation optical system 40t. The subject abuts the forehead against the forehead support member 2. In the state where the forehead is placed on the chin rest 3, when the optical axis of the eye E is within a predetermined distance centering on the measurement optical axis 40L of the optometry unit 5, the eye E on the imaging surface 53a. Since the corneal reflection luminescent spot image Tc is picked up, the control means 35 controls the vertical drive motor 14 and the horizontal drive motor so that the corneal reflection luminescent spot image Tc falls within the allowable range Ma ′ at the center of the imaging surface 53a. Driven to align the measurement optical axis 40L of the optometry unit 5 with the eye E to be examined.
[0027]
The anterior ocular segment images illuminated by the anterior ocular segment illumination light sources 49a to 49d are transmitted through the viewing window 4R and the protective glass 48 and then enter the optometry unit 5 and reflected by the light splitting member 47 in the direction of the lens 50. Then, after passing through the lens 50 and reflected by the half mirror 51 and converged by the lens 52, it is formed on the imaging surface 53a of the two-dimensional imaging element 53 as corneal reflection bright spot images Tia to Tid.
[0028]
After the positioning of the eye E on the imaging surface 53a of the two-dimensional imaging device 53 is completed, the control means 35 drives the optometry unit 5 back and forth by the front-rear direction drive motor 9 to perform focusing. The focusing means is performed by detecting the degree of blurring of the corneal reflection luminescent spot image Tc after moving a minute distance in any predetermined direction before or after the optometry unit 5. That is, after the alignment of the eye E on the imaging surface 53a of the two-dimensional image sensor 53 is completed, the optometry unit 5 is slightly moved in the direction of the eye E, and the corneal reflection bright spot images before and after the movement are moved. The size or brightness of the image of Tc is compared, and focusing is performed by determining whether the corneal reflection bright spot image Tc is small or bright.
[0029]
When the size of the corneal reflection bright spot image Tc decreases or becomes brighter, the optometry unit 5 is further moved in the direction of the eye E to be examined. When the size of the corneal reflection luminescent spot image Tc becomes larger or darker, the size or brightness of the corneal reflection luminescent spot image Tc is slightly moved in the opposite direction, that is, the direction away from the eye E. Compare again. The position where the degree of blur of the corneal reflection bright spot image Tc is the minimum is the optimum focus state.
[0030]
As shown in FIG. 11, when the start switch 28a is pressed after confirming that the corneal reflection luminescent spot image Tc is incident on the alignment mark Ma, the eye refractive power measurement described later is started. The measurement result is displayed on a monitor screen 32a as shown in FIG. 11, and the measurement result can also be output from the printer 34 by pressing the print switch 28b of the operation panel unit 28 as necessary.
[0031]
When the fundus index light source 41 is turned on, the luminous flux emitted from the fundus fundus index light source 41 is a lens 42, a projection diaphragm 43, a hole 44a of a perforated mirror 44, a light dividing member 45, an objective lens 46, a light dividing member 47, Projected onto the fundus Er through the protective glass 48. The reflected image of the light beam projected onto the fundus Er is emitted from the pupil Ep and reflected around the hole 44a of the perforated mirror 44 via the protective glass 48, the light dividing member 47, the objective lens 46, and the light dividing member 45. Is done. The reflected fundus index light source image is transmitted through the six openings 61a of the diaphragm 61, divided by the prism 62, and the imaging surface of the two-dimensional imaging device 64 through the imaging lens 63 as shown in FIG. 64a. This fundus index light source image is projected as six positions Ia to If on the imaging surface 64a, and the eye refractive power of the eye E can be calculated by analyzing the positional relationship between these positions Ia to If. .
[0032]
After this series of measurements is completed, the control means 35 aligns the optometry unit 5 with the left-eye viewing window 4L, and measures the left eye in the same manner as the right eye.
[0033]
If the examiner selects automatic measurement using the selection switch 28c, “Auto” is displayed on the monitor screen 32a as shown in FIG. After confirming this display, the alignment and measurement of the eye E is automatically started by pressing the start switch 28a.
[0034]
A case where the cornea reflection bright spot image Tc cannot be identified mainly during this automatic measurement will be described next. When the optical axis of the eye E is out of a predetermined range centering on the measurement optical axis 40L of the optometry unit 5, the luminous flux of the corneal reflection bright spot image Tc by the cornea Ec is out of the range where the lens 50 detects it. As a result, the cornea reflection bright spot image Tc is not picked up on the image pickup surface 53a. In such a case, it is impossible to perform the above-described alignment with the position of the corneal reflection bright spot image Tc.
[0035]
Further, as shown in FIG. 14, even when the corneal reflection luminescent spot image Tc is hidden by the subject's eyelid hanging, the control means 35 cannot detect the corneal reflection luminescent spot image Tc and cannot adjust the alignment. . In such a case, the cornea reflection images Tia to Tid of the eye E to be examined are changed to be the reference for alignment adjustment by the luminous flux emitted from the anterior segment illumination light sources 49a to 49d instead of the cornea reflection bright spot image Tc. To do.
[0036]
However, for example, when the eyelid of the subject in FIG. 14 hangs down, the cornea reflection images Tia and Tib of the LEDs 49a and 49b of the anterior segment illumination light source are obstructed by the eyelid and are not imaged. The corneal reflection image of the index light source imaged in the above is the corneal reflection image Tia, Tib by the upper anterior segment illumination light sources 49a, 49b, or the corneal reflection image Tic, Tid by the lower anterior segment illumination LEDs 49c, 49d. Therefore, the control means 35 may not be able to determine whether the optometry unit 5 should be moved in the upward or downward direction.
[0037]
In this case, the control means 35 controls the anterior segment illumination light sources 49a to 49d to turn off sequentially for each frame or one field of the imaging cycle of the two-dimensional imaging device 53, thereby imaging the cornea. The reflected image is detected by which light source of the anterior segment illumination light sources 49a to 49d.
[0038]
That is, when the control unit 35 turns off the anterior segment illumination light source 49a, as a result of analyzing the image captured by the two-dimensional imaging device 53, two cornea reflection images are detected, and the anterior segment illumination light source 49b is turned off. Two corneal reflection images are detected, one corneal reflection image is inspected when the anterior segment illumination light source 49c is extinguished, and one corneal reflection image is detected when the anterior segment illumination light source 49d is extinguished If so, it can be determined that the cornea reflection image captured in FIG. 14 is the cornea reflection images Tic and Tid of the lower anterior segment illumination light sources 49c and 49d.
[0039]
In this case, the control unit 35 cannot detect the corneal reflection luminescent spot image Tc even though the corneal reflection images of the lower anterior segment illumination light sources 49c and 49d are substantially near the center of the imaging surface 53a. It can be determined that the wrinkles have fallen and cannot be measured. Therefore, the control means 35 can display and warn that the monitor screen 32a has wrinkles and cannot be measured.
[0040]
FIG. 15 shows an anterior ocular segment image of the eye E to be projected onto the imaging surface 53a. When the optical axis of the eye E is away from the center of the imaging surface 53a, the corneal reflection luminescent spot image is shown. Tc is not imaged on the optical axis of the eye E. Therefore, the control means 35 is turned off one by one in order from the anterior segment illumination light source 49a, and the captured corneal reflection image of the anterior segment illumination light sources 49a to 49d is turned off for each imaging cycle of the two-dimensional imaging element 53. Detect and identify which light source is used.
[0041]
For example, when the control unit 35 turns off the anterior segment illumination light source 49a, as a result of analyzing an image captured by the two-dimensional imaging device 53, two cornea reflection images are detected and the anterior segment illumination light source 49b is turned off. One corneal reflection image was detected, one corneal reflection image was detected when the anterior segment illumination light source 49c was turned off, and two corneal reflection images were detected when the anterior segment illumination light source 49d was extinguished. Then, it can be identified that the cornea reflection image captured in FIG. 15 is the cornea reflection images Tib and Tic by the anterior segment illumination light sources 49b and 49c.
[0042]
Accordingly, since the optometry unit 5 is displaced rightward toward the eye E, if the optometry unit 5 is moved leftward toward the eye E, the corneal reflection bright spot image Tc is two-dimensionally imaged. An image is picked up by the element 53. Hereinafter, as in the case where the optical axis of the eye E is within a predetermined distance centering on the measurement optical axis 40L of the optometry unit 5, the alignment between the eye E and the measurement optical axis 40L of the optometry unit 5 is performed. I do.
[0043]
In addition to the anterior illumination light source, a plurality of index light sources for alignment may be installed outside the optical axis of the eye E. In this case, the anterior segment illumination light source and the index light source are separated, and the change in brightness and appearance of the anterior segment is small by turning on and off the index light source, so that it is easy to see on the monitor screen of the display device 32. Will occur.
[0044]
In addition, although the four anterior segment illumination light sources 49a to 49d projected onto the eye E are four, the number of the illumination light sources may be six or eight. In this case, by increasing the number of illumination light sources, there is an advantage that more detailed position information of the eye E with respect to the optometry unit 5 can be obtained.
[0045]
Further, in the embodiment, a method of sequentially turning off the illumination light sources 49a to 49d projected onto the eye E to be examined is identified, but the anterior segment illumination light sources 49a to 49d are disclosed. The brightness or size of each anterior segment illumination light source is compared by making one anterior segment illumination light source brighter than the other anterior segment illumination light sources by sequentially increasing the current supplied to Thus, the anterior ocular segment illumination light source that is being imaged may be identified.
[0046]
FIG. 16 shows a second embodiment, in which another one of the anterior segment illumination light sources 49e to 49h is arranged inside the anterior segment illumination light sources 49a to 49d.
[0047]
When illuminating the anterior segment, the outer anterior segment illumination light sources 49a to 49d are always turned on, and when identifying the anterior segment illumination light source, the inner anterior segment illumination light sources 49e to 49h are sequentially turned on. Even if it is turned on and off, the same effect can be obtained. In this case, in order to detect lighting of the paired outer and inner anterior segment illumination light sources, for example, anterior segment illumination light sources 49a and 49e, by comparing the sizes of the captured corneal index reflection images It is only necessary to identify which pair of anterior segment illumination light sources is lit.
[0048]
The position of the eye E to be detected by the anterior illumination light source is often four because the optical axis of the eye E is outside the predetermined distance from the measurement optical axis 40L of the optometry unit 5. The anterior segment illumination light sources 49e to 49h are sequentially turned off, and instead of detecting which anterior segment illumination light source image of the corneal index reflected on the imaging surface 53a is located diagonally. Identification may be performed by alternately turning off pairs of anterior segment illumination light sources 49e to 49h.
[0049]
In this case, since the anterior segment illumination light sources 49e to 49h only need to be turned on and off twice in order to detect the shift of the eye E, the time required for identification takes only two frames, and the identification time There is an advantage that can be shortened.
[0050]
【The invention's effect】
As described above, in the ophthalmologic apparatus according to the present invention, the reflection image by the anterior segment illumination light source captured by the light receiving means is the reflection image by which anterior segment illumination light source among the plurality of anterior segment illumination light sources. because it can identify whether the positional relationship with respect to the light receiving optical system of the eye, can be detected in a wide range.
[0053]
Further, by allowing the optometry means to move up, down, left and right with respect to the eye to be aligned for alignment between the optometry means and the eye to be examined, until the index image is placed within the narrow detection range of the position detector in the conventional example Eliminates the need for rough alignment by the examiner's operation, and allows the optometry device to be unmanned and fully automated.
[Brief description of the drawings]
FIG. 1 is a structural view of an optometry apparatus according to a first embodiment.
FIG. 2 is a front view of an eyepiece unit.
FIG. 3 is a plan view of an operation panel unit.
FIG. 4 is a configuration diagram of an optometry unit.
FIG. 5 is a layout view of an anterior segment illumination light source.
FIG. 6 is a front view of a diaphragm.
FIG. 7 is a front view of a prism.
FIG. 8 is a block circuit configuration diagram for optometry control.
FIG. 9 is an explanatory diagram of a monitor screen.
FIG. 10 is an explanatory diagram of an image on an imaging surface.
FIG. 11 is an explanatory diagram of a monitor screen.
FIG. 12 is an explanatory diagram of a fundus index image on an imaging surface.
FIG. 13 is an explanatory diagram of a monitor screen.
FIG. 14 is an explanatory diagram of an image on an imaging surface.
FIG. 15 is an explanatory diagram of an image on an imaging surface.
FIG. 16 is a layout view of an anterior segment illumination light source in the second embodiment.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Main body 5 Optometrist unit 28 Operation panel part 29 Track ball 30 Front-rear roller 32 Display apparatus 35 Control means 41 Fundus index light source 49a-49h Anterior ocular segment illumination light source 52 Projection light sources 53 and 64 Two-dimensional image sensor

Claims (1)

A projection light source that projects an alignment mark onto the eye to be examined along the measurement optical axis of the optometry means;
An anterior ocular illumination light source in which a pair of two light sources respectively arranged on the outer side and the inner side of the circumference of the measurement optical axis are paired, and a plurality of pairs of the light sources are arranged on the diagonal of the measurement optical axis ;
A light receiving optical system for guiding a reflected light beam from a subject eye of the alignment mark and the anterior segment illumination light source to a light receiving unit;
Moving means for moving the optometry unit at least in the vertical and horizontal directions with respect to the eye to be examined;
Control means for moving the optometry unit based on the image picked up by the light receiving means and aligning the measurement optical axis with the eye to be examined;
The control means is positioned diagonally when the alignment mark is not received at a predetermined position of the light receiving means, and when all reflected light beams from all the light source pairs are not captured in the image. The light source pairs are turned on and off sequentially, and the light source pairs are turned on by comparing the magnitudes of the reflected light beams of the eye to be examined by the light source pairs on the image captured by the light receiving means. An ophthalmologic apparatus characterized in that the measurement optical axis and the eye to be examined are aligned based on the identification result .

Images