JP4641102B2 - Fundus camera - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a fundus camera in which a fixation target for guiding an eye to be examined is provided in an illumination optical system.
[0002]
[Prior art]
In a conventional fundus camera, a target rod disposed in the middle of the optical path of the illumination optical system is provided in a conjugate or substantially conjugate manner with the fundus of the subject's eye (the subject's fundus), and the direction of the target rod is orthogonal to the optical axis. A fixation target device provided in a movable manner is considered.
[0003]
In this fundus camera, the fixation direction of the eye to be examined can be guided by moving the target rod in a direction perpendicular to the optical axis and changing the position of the target rod with respect to the optical axis. The position can be photographed simultaneously with the fundus image.
[0004]
In addition, a non-mydriatic fundus camera that can observe infrared light projects a fixed point image onto the fundus of the eye to be examined through a part of the optical path of the imaging optical system as a fixation target. An optotype device is considered.
[0005]
[Problems to be solved by the invention]
However, since the conventional fixation target device simply projects a fixed fixation target on the eye to be examined, the fixation target cannot always be recognized by a person with low vision or a person with a disease in the fundus. There was a case. In this way, it is desirable to be able to easily and accurately diagnose how a subject with amblyopia or fundus disease looks.
[0006]
Accordingly, an object of the present invention is to provide a fundus camera that can easily and accurately diagnose how a subject having amblyopia or fundus disease looks.
[0007]
[Means for Solving the Problems]
In order to achieve this object, a fundus camera according to a first aspect of the present invention includes an illumination system that illuminates the fundus of a subject's eye, an observation system that observes the fundus illuminated by the illumination system, and a fixation target light flux at a tip portion. A fixation target that is disposed in the illumination system, and the distal end portion is provided so as to be movable in the X and Y directions together with the fixation target. Corresponding to the response input means that the examiner or the subject inputs the presentation state of the tip according to the response of the subject, the response input by the response input means and the presentation state of the fixation target A recording means for recording; and infrared light is emitted from the illumination system, and a fixation target stick image of the fixation target stick is projected onto the fundus by the infrared light, so that the fundus and the fixation target stick image are obtained. and a control circuit for observation with infrared light by the observation system, the control circuit The fixation target device is controlled during observation with the infrared light, and the fixation target luminous flux to be visually recognized by the eye to be inspected is emitted from a distal end portion of the fixation target rod and projected onto the fundus. To do.
[0008]
Further, the fundus camera according to a second aspect of the invention, in the fundus camera according to claim 1, wherein the fixation target device is characterized in that the light quantity and color of the tip can be changed.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[Constitution]
FIG. 1 shows an example of a main part of an optical system of a fundus camera (ophthalmic examination apparatus) for photographing (imaging) a fundus image to be processed in the present invention. Illumination for illuminating the fundus of the eye to be examined A system (illumination optical system) A, an observation photographing system (observation photographing optical system) B for observing or photographing the fundus of the eye to be examined, a fixation target device C (see FIGS. 1 to 4), and a control circuit D ( (See FIG. 5).
<Lighting system A>
This illumination system A has an observation illumination optical system 1 and a photographing illumination optical system 2.
(Observation illumination optical system 1)
The observation illumination optical system 1 includes an observation illumination light source 3, a condenser lens 4, an infrared filter 5, an oblique half mirror 6, a ring slit 7, a relay lens 8, a half mirror 9, a relay lens 10, and an opening hole 11a in the center. It has a perforated mirror 11 and an objective lens 12. The infrared filter 5 cuts visible light and transmits only infrared light. The light emitted from the observation illumination light source 3 is converted into a parallel light beam by the condenser lens 4 and then the visible light is cut by the infrared filter 5. The infrared light after the visible light is cut off is reflected by the oblique half mirror 6 and then passes through the ring slit 7, the relay lens 8, the half mirror 9, the relay lens 10, the perforated mirror 11 and the objective lens 12. Are projected onto the fundus oculi Ef of the eye E to illuminate the fundus oculi Ef of the eye E to be examined.
(Photographing illumination optical system 2)
The photographing illumination optical system 2 includes a photographing illumination light source 13, a condenser lens 14, an oblique half mirror 6, a ring slit 7, a relay lens 8, a half mirror 9, a relay lens 10, a perforated mirror 11, and an objective lens 12. . The light emitted from the photographing illumination light source 13 is converted into a parallel light beam by the condenser lens 4, and then transmitted through the oblique half mirror 6, and the ring slit 7, relay lens 8, half mirror 9, relay lens 10, The light is projected onto the fundus oculi Ef of the eye E through the perforated mirror 11 and the objective lens 12 to illuminate the fundus oculi Ef of the eye E.
<Observation photography system B>
The observation photographing system B has a photographing optical system b1 and an observation optical system b2.
(Shooting optical system b1)
The photographing optical system b1 includes an objective lens 12, an opening hole 11a of the perforated mirror 11, a focusing lens 15, an imaging lens 16, and a photographing device (imaging device) 17 in this order. As the photographing device 17, a polaroid camera, a 35 mm camera, an electronic still camera, a TV camera, or the like can be used.
[0011]
Then, the light beam reflected by the fundus oculi Ef of the eye E passes through the objective lens 12 and the aperture hole 11a of the perforated mirror 11, and is then imaged by the imaging device 17 by the focusing lens 15 and the imaging lens 15 ( A fundus image of the eye to be examined is formed on a film or a CCD.
(Observation optical system b2)
The observation optical system b2 includes an objective lens 12, an aperture hole 11a of the perforated mirror 11, a focusing lens 15, and an imaging lens 16. The observation optical system b2 includes a quick return mirror 18, a field lens 19, an oblique mirror 20, a relay lens 21 and an infrared TV camera (removable) provided between the imaging lens 16 and the photographing device 17 so as to be detachable. An infrared imaging tube (imaging means) 22, an arithmetic control circuit 22a to which a video signal from the infrared television camera 22 is input, and a monitor television (display device) for displaying the fundus oculi Ef and the like from the video signal from the arithmetic control circuit 22a 23. As described above, when photographing the fundus oculi Ef of the eye E with the photographing device 17, the quick return mirror 18 is removed from between the imaging lens 16 and the photographing device 17 as indicated by a broken line.
[0012]
The reflected light beam from the fundus oculi Ef is obtained when the quick return mirror 18 is inserted between the imaging lens 16 and the photographing device 17, the objective lens 12, the aperture hole 11 a of the perforated mirror 11, and the focusing lens 15. , After being guided to the imaging lens 16, it is received by the infrared TV camera 22 through the quick return mirror 18, the field lens 19, the oblique mirror 20, and the relay lens 21, and the fundus image is taken by the infrared TV camera 22. (Imaging). The video signal from the infrared television camera 22 is inputted to the monitor television 23, and the fundus oculi Ef of the eye E to be examined is displayed on the monitor television 23.
<Fixation target device C>
The illumination system A and the observation photographing system B are accommodated in the main body case 24 of FIG. 2 except for the photographing device 17 and the monitor television 23 as shown in FIG. A large-diameter moving hole 25 is formed in the main body case 24 between the oblique mirror 9 and the relay lens 10 as shown in FIG. A cylinder 26 of the fixation target device C is inserted into the moving hole 25 of the main body case 24. In FIG. 1, the fixation target device C is disposed on the front side of the main body case 24 for convenience of explanation, but the fixation target device C is actually disposed on a side surface in a direction orthogonal to the paper surface of FIG. 1. The
[0013]
The cylinder 26 is fixed with light shielding plates 27 and 28 that close the moving hole 25 in close contact with the inner surface and the outer surface of the main body case 24, respectively. The light shielding plates 27 and 28 are provided so as to be slidable with respect to the inner side surface and the outer side surface of the main body case 24, respectively.
[0014]
The light shielding plates 27 and 28 are arranged in a direction (Z direction) along the optical axis O between the oblique mirror 9 and the relay lens 10 of the illumination system A, and the inner side surface of the main body case 24 orthogonal to the Z direction. In addition, the cylinder 26 is provided so as to be movable in the X direction along the outer surface, and so that the cylinder 26 does not rotate around the axis during these movements.
[0015]
For example, although not shown, a first guide rail attached to the inner surface of the main body case along the optical axis O, a first slider movably provided on the guide rail, and the first slider A table mechanism comprising a second guide rail provided in a direction perpendicular to the guide rail and a second slider provided movably on the second guide rail is provided as a slide mechanism. Then, by holding the case main body 24 or the light shielding plate 27 located on the inner surface side of the case main body 24 by the second slider, the cylinder 26 moves in the X and Z directions but cannot rotate around the axis. It becomes.
[0016]
A slider 29 is held in the cylinder 26 so as to be able to advance and retract. A slit 30 extending in the longitudinal direction is formed on the lower surface of the cylinder 26. A small diameter portion 31 a of the cylindrical light source holding member 31 is inserted into the slit 30 so that there is no play in the width direction of the slit 30 and is movable in the longitudinal direction of the slit 30, and the slider 29 is the axis of the cylinder 26. It does not rotate around. The small diameter portion 31a is fixed to the slider 29 by screwing, bonding, welding, or the like.
[0017]
A light source mounting hole 32 is formed in the light source holding member 31 as shown in FIGS. 2 to 4, and a fixation light source 33 is disposed in the lower end portion of the light source mounting hole 32. Further, as shown in FIG. 4, the light source holding member 31 is formed with through holes 34 and 35 penetrating the upper part of the light source mounting hole 32 in the direction along the light shielding plate 28, and the through holes 34 and 35 have a filter. The holding member 36 is inserted in parallel with the light shielding plate 28. The filter holding member 36 has three filter mounting holes 36a, 36b, 36c arranged in parallel, and the three filter mounting holes 36a, 36b, 36c have different transmission characteristics (for example, red, blue, green, etc.). Filters F1, F2, and F3 having transmission characteristics are attached. Magnetic bodies M1 and M2 are attached to both ends of the filter holding member 36, and proximity switches S1 and S2 are attached to the outer surface of the light source holding member 29 in proximity to the through holes 32 and 32a.
[0018]
In addition, a fiber mounting hole 37 that opens to the upper end of the light source mounting hole 32 is formed in the upper end portion of the light source holding member 31, and a cylindrical body 38 that penetrates the end wall 26 a in the body case 24 of the cylinder 26 is formed in the slider 29. It is provided integrally. Both ends of the optical fiber 39 are fitted and fixed to the fiber mounting hole 37 and the cylinder 38. One end 39 a of the optical fiber 39 faces the center of the upper end of the light source mounting hole 32. The other end 39b of the optical fiber 39 protrudes from the cylindrical body 38 and is bent toward the relay lens 10 in the direction along the optical axis O.
[0019]
The slider 29 is integrally provided with an operation shaft 29a that protrudes outwardly through the outer end wall 26b of the cylinder 26, and an operation knob 29b is provided at the end of the operation shaft 29a.
<Control circuit D>
The control circuit D includes an arithmetic control circuit 22a shown in FIG. 5 and proximity switches (detection means) S1, S2 connected to the arithmetic control circuit 22a.
[0020]
The arithmetic control circuit 22a controls the operation of the observation illumination light source 3, the imaging illumination light source 13, the fixation light source 31, and the like, and the operation of the solenoid 18a. The solenoid 18a is configured to retract the quick return mirror 18 from between the imaging lens 16 and the photographing device 17 as shown by a broken line during operation.
[0021]
Further, the control circuit D includes a light amount switching unit 40, a blinking cycle switching unit 41, and a recording unit 42 connected to the arithmetic control circuit 22a. For the light amount switching means 40, a volume switch or a rotary switch for switching the light amount of the fixation light source 33 is used. The blinking cycle switching means 41 is also a volume switch or a rotary switch that switches the blinking cycle of the fixation light source 33. As the recording means 42, other information recording / reproducing devices such as a memory, a hard disk, a magneto-optical disk, a DVD-RAM, an MO, a CDR, and a CD-RW can be used.
[0022]
Further, a response switch 43 that is operated by the subject or operated by the examiner according to the response of the subject and a speaker 44 are connected to the arithmetic control circuit 22a.
[Action]
Next, the operation of the ophthalmic examination apparatus (fundus camera) having such a configuration will be described.
(1). In this configuration, when the power switch (not shown) of the fundus camera is turned on, the arithmetic control circuit 22a turns on the observation illumination light source 3 and turns on the fixation light source 33. . At this time, the quick return mirror 18 is inserted between the imaging lens 16 and the photographing device 17.
[0023]
Thus, the light emitted from the observation illumination light source 3 is converted into a parallel light beam by the condenser lens 4 and then the visible light is cut by the infrared filter 5. The infrared light after the visible light is cut off is reflected by the oblique half mirror 6 and then passes through the ring slit 7, the relay lens 8, the half mirror 9, the relay lens 10, the perforated mirror 11 and the objective lens 12. Are projected onto the fundus oculi Ef of the eye E to illuminate the fundus oculi Ef of the eye E to be examined. At this time, the shadow of the cylinder (fixation stick) 38 of the fixation target device C is projected onto the fundus oculi Ef.
[0024]
The reflected light beam reflected from the fundus oculi Ef by this illumination is guided to the objective lens 12, the aperture hole 11a of the perforated mirror 11, the focusing lens 15, and the imaging lens 16, and then the quick return mirror 18, the field lens 19, and the oblique lens. The infrared TV camera 22 receives light through the mirror 20 and the relay lens 21, and a fundus image is taken (captured) by the infrared TV camera 22. The video signal from the infrared television camera 22 is input to the monitor television 23, and the monitor television 23 has a fundus blood vessel image 50 of the fundus oculi Ef of the eye E, a papilla 51, a macular portion 52, and a fovea 52a as shown in FIG. and fundus image Ef including the fixation target Bozo 53 etc. 'are displayed in real time.
[0025]
On the other hand, the fixation light beam emitted from the fixation light source 33 passes through the light source mounting hole 32 of the filters F1, F2, and F3, in the drawing, the filter F2, and enters the optical fiber 39. At this time, the fixation light flux transmits light having the wavelength of the filter F2. For example, if the color of the filter F2 is green, the light having the green wavelength passes through the filter F2, and the light having the transmitted wavelength. The fixation light beam enters the optical fiber 39 from one end 39a. The fixation light beam incident on the optical fiber 39 exits from the other end 39b of the optical fiber 39 and is projected as a fixation target on the fundus oculi Ef via the relay lens 10, the perforated mirror 11, and the objective lens 12. The
[0026]
As a result, the eye E is fixed with the fixation light beam projected onto the fundus oculi Ef. In this state, the examiner grasps the operation knob 29b, moves the slider 29 forward and backward in the longitudinal direction (Y direction) of the cylinder 26, and moves the other end portion (tip portion) 39a of the optical fiber 39 with respect to the optical axis O. by advancing and retracting movement, the fixation target Bozo 53 in FIG. 6 is moved forward and backward in the direction indicated by the arrow 54. Further, the cylinder 26 is moved back and forth in the X direction, and the other end (tip portion) 39a of the optical fiber 39 is moved in a direction perpendicular to the Y direction and perpendicular to the optical axis O. The fixation target stick image 53 in FIG. 6 moves forward and backward in the direction indicated by the arrow 55. Further, by moving the cylinder 26 in the Z direction, the fixation target stick image 53 in FIG. 6 moves forward and backward in the directions indicated by the arrows 56 and 57, and the fixation target stick image 53 displayed on the monitor television 23 is changed. The sharpness changes.
[0027]
Accordingly, the examiner moves the cylinder 26 in the Z direction, and the fixation target stick image 53 in FIG. 6 is moved forward and backward in the directions indicated by the arrows 56 and 57, whereby the fixation image displayed on the monitor television 23 is displayed. The mark image 53 is made clear.
[0028]
In this state, the other end portion (tip portion) 39a of the optical fiber 39 is moved in the Y direction and the X direction as described above, whereby the fixation target stick image 53 in FIG. The eye E is guided by performing a forward / backward movement operation in the direction indicated by.
(2). By the way, when examining the relationship between the retina and visual acuity, visual acuity is the best in the fovea 52a, and worsens rapidly as the distance from the fovea 52a increases. Therefore, in fact, for a healthy person, the fovea 52a can be seen best, and the inside of the macular part 52 including the fovea 52a can be seen relatively well. become.
[0029]
However, if there is some disease in the central fovea 52a and the visual acuity of the central fovea 52a is almost lost, the fixation target luminous flux is projected to the subject even if the fixation target light flux is projected on the central fovea 52a. Will not be visible. Further, when there is a similar disease in a part of the macular portion 52, the fixation target luminous flux cannot be seen in the diseased portion as well.
[0030]
In such a case, the fixation target stick image 53 in FIG. 6 is moved to the arrow 54 by moving the other end portion (tip portion) 39a of the optical fiber 39 in the Y direction and the X direction as described above. , 55 is operated intermittently or slowly in the direction indicated by 55. In accordance with this moving operation, the examiner makes a response whether or not the fixation target luminous flux is visible to the examinee at predetermined intervals or at regular intervals. As the response timing, the arithmetic control circuit 22a emits a signal sound for prompting the response from the speaker 44 to let the subject hear, and responds when this sound is heard.
[0031]
For example, when there is a response of “not visible”, the examiner presses the response switch 43 to input the ON signal from the response switch 43 to the arithmetic control circuit 22a. Accordingly, the arithmetic control circuit 22a records one frame of the fundus oculi image Ef ′ including the fixation target stick image 53 to other information recording / reproducing such as a hard disk, a magneto-optical disk, a DVD-RAM, an MO, a CDR, and a CD-RW. Record on device.
[0032]
The response switch 43 may be operated by the subject. That is, when a signal sound that prompts a response is received from the speaker 44 and “cannot be seen”, the response switch 43 may be pressed, and the image at this time may be recorded as described above.
[0033]
By analyzing a large number of fundus images and fixation target stick images 53 obtained in this way and displaying a map of invisible positions superimposed on the fundus image, the range and state of the diseased part of the fundus oculi Ef is known. Can be used to determine fundus diseases.
[0034]
A fixation target for guiding and fixing the eye to be inspected and an inspection optical system for projecting a light beam for inspecting a diseased part such as the above-mentioned fixation light beam onto the fundus as an inspection light beam are provided in the observation system. The light beam for inspection described above may be projected onto the fundus by the inspection optical system in a state in which the fixation target is fixed in a predetermined direction. In this case, it is also possible to perform the same inspection as described above by randomly projecting the inspection light beam at many locations on the fundus. This inspection can be replaced with a perimeter inspection.
[0035]
In this case, the inspection optical system can be configured to include a plurality of inspection light sources arranged in a direction orthogonal to the optical axis. In addition, this test can be used together with perimetry data to test a more accurate fundus disease.
(3) Examination in the case of amblyopia etc. In the case of a person with amblyopia, the visual acuity is weak, but there is no explanation as to whether or not there is more in the eyeball or optic nerve. In particular, when there is an abnormality in the optic nerve, it is possible to specify which position of the optic nerve is bad by performing the examination as shown in (2). Moreover, in the case of a low vision person, it may not know where he is looking. Also in this case, it is possible to specify where the user is looking by performing the inspection as shown in (2).
[0036]
Further, the examiner sequentially switches the light amount of the fixation light source 33 by the light amount changeover switch 40, and when the light amount for fixation light emitted from the other end portion (tip portion) 39a of the optical fiber 39 becomes a light amount. Check if the subject can see. Also in this case, when there is a response from the examinee that “it was visually recognized”, the examiner turns on the response switch 43 or when the examinee “is able to visually confirm”, the response switch 43 is set. Let them turn on. Then, the recording means 42 records the light amount of the fixation light source 33 at this time.
[0037]
In addition, the filter holding member 36 is slid in the longitudinal direction to sequentially switch the filters F1 to F3 facing the light source mounting hole 32, and the light amount changeover switch 40 sequentially switches the light amount of the fixation light source 33, and the light. It is confirmed how much light the fixation light beam emitted from the other end portion (tip portion) 39a of the fiber 39 becomes visible to the subject. Also in this case, when there is a response from the examinee that “it was visually recognized”, the examiner turns on the response switch 43 or when the examinee “is able to visually confirm”, the response switch 43 is set. Let them turn on. Then, the recording means 42 records the light amount of the fixation light source 33 at this time and which of the filters F1 to F3 corresponds to each other.
[0038]
At this time, the arithmetic control circuit 22a can determine whether or not the filters F1 to F3 face the light source mounting hole 32 based on whether the proximity switches S1 and S2 detect the magnetic bodies M1 and M2. . That is, if the proximity switches S1 and S2 have not detected any of the magnetic bodies M1 and M2, it can be seen that the filter F2 faces the light source mounting hole 32, and if the proximity switch S1 has detected the magnetic body M1. It can be seen that the filter F1 faces the light source mounting hole 32, and that the filter F2 faces the light source mounting hole 32 if the proximity switch S2 detects the magnetic body M2. This determination is made by the arithmetic control circuit 22a.
[0039]
In this way, it is possible to quantitatively diagnose the degree of amblyopia of the eye E by confirming how much light the eye E can visually recognize for which color.
[0040]
In addition to making a diagnosis by switching the light amount and color of the fixation light beam, the blinking cycle switching means 41 is operated to blink the fixation light source 33 and change the blinking cycle. Then, let the subject confirm whether or not the blinking period (flashing interval) of the fixation light source 33 is known, and turn on the response switch 43 when confirming in the same manner as described above. By recording the blinking period (flashing interval) at this time in the recording means 42, the degree of amblyopia of the eye E can be quantitatively diagnosed.
[0041]
Further, a fixation light beam emitted from the other end portion (tip portion) 39a of the optical fiber 39 by combining the relationship between the change in the blinking period of the fixation light source 33 and the change in the light amount and the color of the fixation light beam. Is projected onto the fundus oculi Ef and the response switch 43 is turned on when it can be confirmed in the same manner as described above, and the blinking cycle (flashing interval) of the fixation light beam (fixation target) at this time, the light amount, the color, etc. Is recorded in the recording means 42, the degree of amblyopia of the eye E can be quantitatively diagnosed.
[0042]
As described above, the fixation target device is configured to be able to switch between the lighting state and the blinking presentation state of the fixation target, so that it is possible to easily diagnose a difference in appearance when lighting or blinking. In addition, the fixation target device can quantitatively diagnose how much the amount of light changes by changing the brightness of lighting and blinking of the fixation target. Furthermore, the fixation target device presents the fixation target in a blinking presentation state, and can be configured to switch the blinking cycle, thereby quantitatively diagnosing how much the blinking interval changes the appearance. it can. Further, the fixation target apparatus can quantitatively diagnose how much the light intensity and the blinking interval change the appearance by adopting a configuration in which the fixation target can change the blinking luminance. Furthermore, by adopting a configuration in which the fixation target presentation state has two or more presentation colors, it is possible to quantitatively diagnose which presentation color changes the appearance.
[0043]
【The invention's effect】
As described above, the fundus camera of the first aspect of the invention includes the illumination system that illuminates the fundus of the eye to be examined, the observation system that observes the fundus illuminated by the illumination system, and the fixation target luminous flux from the tip. A fixation target that is disposed in the illumination system and emits toward the fundus, and the distal end portion is provided so as to be movable in the X and Y directions together with the fixation target; and Response input means for the examiner or the subject to input the presentation state of the tip according to the response of the subject, and the response input by the response input means and the presentation state of the fixation target are recorded correspondingly Recording means for emitting infrared light from the illumination system, and projecting a fixation target stick image of the fixation target stick onto the fundus by the infrared light, so that the fundus and the fixation target stick image are and a control circuit for observation with infrared light by the observation system, and the control circuit, before And controls the fixation target device upon observation by the infrared light, the so said fixation ShimegiHikaritaba to visually recognize the subject's eye has a configuration to be projected onto the fundus is emitted from the tip of the fixation target rod, It is possible to easily and accurately diagnose how a subject having amblyopia or fundus disease looks.
[Brief description of the drawings]
FIG. 1 is an explanatory diagram showing an example of an optical system of an optometry apparatus.
FIG. 2 is a cross-sectional view of the fixation target device shown in FIG.
FIG. 3 is a partially enlarged view of FIG. 2;
4 is a cross-sectional view taken along line AA in FIG.
5 is a control circuit diagram of the optometry apparatus shown in FIG. 1. FIG.
6 is an explanatory diagram showing a display example of a display screen of the monitor television shown in FIG. 1. FIG.
[Explanation of symbols]
E ... Eye to be examined Ef ... Fundus A ... Illumination system (illumination optical system)
B ... Observation and photographing system (observation and photographing optical system)
C ... fixation target device D ... control circuit 22 ... infrared TV camera (imaging means)
22a ... arithmetic control circuit 22a
23 ... Monitor TV (display device)
40 ... light quantity switching means 41 ... flashing cycle switching means 42 ... recording means 43 ... response switch

Claims (2)

An illumination system for illuminating the fundus of the eye to be examined;
An observation system for observing the fundus illuminated by the illumination system;
A fixation target rod that emits a fixation target luminous flux from the tip portion toward the fundus is disposed in the illumination system, and the tip portion is provided so as to be movable in the X and Y directions together with the fixation target rod. Fixed fixation device,
Response input means for the examiner or the subject to input the presentation state of the tip according to the response of the subject;
Recording means for recording the response input by the response input means and the presentation state of the fixation target correspondingly ;
Infrared light is emitted from the illumination system, a fixation target stick image of the fixation target stick is projected onto the fundus by the infrared light, and the fundus and the fixation target stick image are infrared by the observation system. A control circuit for observing with light ,
The control circuit controls the fixation target device during observation with the infrared light, emits the fixation target luminous flux to be visually recognized by the eye to be inspected, and projects it on the fundus. A fundus camera characterized by 2. The fundus camera according to claim 1, wherein the fixation target device is capable of changing a light amount and a color of the tip portion.

Images