JP2007185324A - Retinal camera - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a retinal camera which permits a quality photographing of an ocular fundus even when photographing is performed with the position of a photographic diaphragm changed as in stereoscopic photographing. <P>SOLUTION: A photographic diaphragm 31a is chosen for normal photographing and photographic diaphragms 31b and 31c are chosen for stereoscopic photographing. In accordance with the chosen photographic diaphragm, the sizes 101a and 102a of a black spot are varied. The position, shape and number of the black spot not the size of the black spot or in place thereof. Even when the position of the photographic diaphragm is changed as in stereoscopic photographing, the image of the black spot in the chosen photographic diaphragm surface can be made to cover the entire photographic diaphragm and by preventing reflected light in an objective lens from passing through the photographic diaphragm, a good image of an ocular fundus without harmful light can be obtained. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a fundus photographing apparatus, and more particularly, to a fundus photographing apparatus capable of performing stereo photographing for photographing a fundus by changing the position of a photographing aperture.

  Conventionally, in a fundus photographing apparatus, in order to prevent reflection of the objective lens by photographing light at the time of fundus imaging, a black spot has been placed at a position conjugate to a photographing aperture image by reflected light of each surface of the objective lens. In general, this black spot is formed by providing a light shielding member on a flat glass disposed in the optical path of the illumination optical system (for example, Patent Document 1).

  Further, conventionally, stereoscopic imaging has been performed by taking two images with parallax with respect to the same eye to be examined, and displaying the images in pairs, thereby stereoscopically viewing the eye to be examined. . In a stereo photographing apparatus capable of photographing an image having parallax, a photographing diaphragm (two-hole diaphragm) in which two left and right holes are formed is provided at a position conjugate with the pupil of the eye to be examined with respect to the objective lens, and a shutter. In accordance with the operation, photographing from one hole of the photographing aperture is switched to photographing from the other hole, and two images for stereoscopic viewing are continuously acquired (Patent Document 2).

  By the way, in such a stereo photographing device, when photographing the fundus by changing the position of the photographing aperture, unless the black spot position is adjusted by the position of the photographing aperture, the reflection of the objective lens by the photographing light at the time of fundus imaging is sufficiently obtained. There is a problem that an artifact such as a white spot is generated at the center of the photographed fundus image, and the quality and reliability of the fundus image for stereoscopic viewing are deteriorated.

In order to prevent reflection of the anterior segment, the size of the photographing aperture is linked with the size of the light shielding point in the illumination optical path (Patent Document 3), or the position of the light shielding point in the illumination optical path is determined depending on the photographing mode. The function of the black spot is invalidated (Patent Document 4), or the light shielding point in the illumination optical path is moved in the optical axis direction according to the photographing magnification (Patent Document 5).
Japanese Patent Laying-Open No. 2005-253811 JP 59-90547 A JP-A-5-199997 JP-A-55-26959 JP-A-56-97433

  Since the light shielding point for preventing reflection of the objective lens is arranged at a position close to the fundus conjugate position, it has a large influence on the photographed image, and positional accuracy is required, so that reflection of the anterior ocular segment is prevented. Therefore, the movement mechanism as described in Patent Documents 3 to 5 cannot be used as it is as a means for preventing reflection of the objective lens, and conventionally, it is based on photographing light at the time of stereo photographing and fundus photographing. There was a problem that reflection of the objective lens could not be sufficiently prevented.

  The present invention has been made to solve such problems, and it is an object of the present invention to provide a fundus photographing apparatus capable of photographing fundus with high quality even when photographing is performed by changing the position of the photographing aperture. And

The present invention
An illumination optical system for illuminating the eye fundus of the eye to be examined through an objective lens;
A black spot plate disposed in the illumination optical system to remove harmful light based on surface reflection of the objective lens;
An imaging optical system that guides light from the fundus of the subject's eye that has passed through the objective lens to the image sensor via the imaging aperture;
Selecting means for selecting a photographing aperture at a different position;
According to the photographing aperture selected by the selection means, at least one of the position, shape, size, and number of black spots of the black spot plate is changed.

  In the present invention, at least one of the black spot shading parameters, i.e., the position, shape, size, and number of black spots, can be changed according to the position of the shooting aperture, so that shooting can be performed by changing the position of the shooting aperture such as stereo shooting. Even when it is performed, the reflected light from the objective lens can be prevented from passing through the photographing aperture, and a good fundus image from which harmful light has been removed can be obtained.

  Hereinafter, the fundus imaging apparatus will be described in detail using a fundus camera as an example.

  In the fundus camera 10 of FIG. 1, an observation lamp 11 that emits infrared light and visible illumination light is disposed at the center of curvature of the spherical mirror 12, and light from the observation lamp 11 and the spherical mirror 12 is inserted into the optical path. The light passes through a removable visible light cut infrared light transmission filter 13, a condenser lens 14, a strobe 15 as a photographing light source, and a condenser lens 16, and then enters a total reflection mirror 17.

  The illumination light reflected by the total reflection mirror 17 passes through the normal shooting black spot plate 101, the stereoscopic shooting black spot plate 102 and the relay lens 22 through the ring slit 21 as an illumination stop, and is perforated by the perforated total reflection mirror 23. The light is reflected and enters the anterior eye part (pupil) Ep of the eye E through the objective lens 24.

  The ring slit 21 includes a moving light shielding plate 19 and a fixed diaphragm 20, and is disposed at a position substantially conjugate with the anterior segment Ep (pupil) of the eye to be examined in the illumination optical system. As shown in FIG. 5, the moving light shielding plate 19 is made of a transparent glass plate having circular light shielding portions 19a, 19b, 19c, and the fixed diaphragm 20 is an aperture diaphragm having an opening 20a in the center. 19 takes positions shown in FIGS. 5A, 5B, and 5C according to the movement, and an illumination light pattern corresponding to the position of the light shielding plate 19 is obtained.

  The reflected light from the fundus Er illuminated by the illumination optical system is used for the objective lens 24, the perforated total reflection mirror 23, the fixed aperture 31, the moving aperture unit 32, the focusing lens 35, and the imaging lens 36 that constitute the imaging optical system. Then, the light passes through the half mirror 37 and the variable magnification lens 38a and enters the return mirror 39. At the position where the return mirror 39 is shown, the reflected light from the fundus is incident on a CCD (imaging means) 40 at a position conjugate with the fundus sensitive to infrared light, and the fundus is imaged by the CCD 40. When the return mirror 39 leaves the optical path, the reflected light from the fundus enters the CCD (imaging means) 41 conjugate with the fundus sensitive to visible light, and the fundus is imaged by the CCD 41.

  The perforated total reflection mirror 23 is a total reflection mirror provided with an opening 23a in the center as shown in FIG. 2C, and the fixed diaphragm 31 is located in the center as shown in FIG. 2B. An aperture provided with an imaging aperture 31a for normal imaging and imaging apertures (two-hole apertures) 31b and 31c for focus index projection and stereo imaging on both sides thereof, and is fixed in close contact with the perforated total reflection mirror 23. . The photographing apertures 31a, 31b, and 31c are preferably rectangular in order to secure light quantity and reduce aberrations. However, in this embodiment, the photographing apertures 31b and 31c are circular, and the imaging aperture 31a is It is formed in a vertically long ellipse.

  Each imaging aperture 31a, 31b, 31c is disposed at a position substantially conjugate with the anterior eye portion (pupil) to be examined. In this case, the photographing aperture 31a is arranged at a position (first position) whose center coincides with the optical axis (optical axis of the photographing optical system) 26 of the objective lens 24, and the photographing aperture 31b is arranged on the left and right for stereoscopic viewing. In order to obtain the image, the left optical path position (second position) when the imaging optical path is divided into left and right at the pupil conjugate position, and the imaging aperture 31c is arranged at the right optical path position (third position). The

  Further, as shown in FIG. 2A, the moving aperture unit 32 has cutout portions 32a, 32b, and 32c, and a reflecting prism that reflects the focus index toward the fundus on both sides of the cutout portion 32a. 32d and 32e (see also FIG. 4) are provided. When the movable aperture unit 32 is moved in the vertical direction and moved to the position shown in FIG. 3A, the cutout portion 32a opens the aperture of the imaging aperture 31a, and the imaging aperture 31a is selected. 3B and 3C, the notches 32b and 32c open the apertures of the imaging apertures 31b and 31b, respectively, and the imaging aperture 31b or 31c is selected.

  Further, as shown in FIG. 6, the normal shooting black spot plate 101 has a circular black spot 101a at the center, and the stereo shooting black spot plate 102 has a circular black spot 102a at the center. As will be described later, when the stereo shooting mode is set, as shown in FIG. 6A, the black spot plates 101 and 102 are both in contact with the stopper 103, and the centers of the black spots 101a and 102a are centered. The position coincides with the optical axis 100 of the illumination optical system. On the other hand, when the normal photographing mode (monocular photographing mode) is set, the black spot plate 102 is driven by the control unit 65 to leave the optical path of the illumination optical system, and the black spot plate 101 becomes effective.

  Regarding the image formation by the reflected light of the photographing light at the objective lens 24, the black spots 101a and 102a are respectively arranged at positions almost conjugate with the photographing aperture. The size of the black point 101a for normal photographing is set to a size such that the image 101b of the black point 101a on the photographing aperture surface covers the entire photographing aperture 31a as shown in FIG. The size of the black spot 102a for stereo shooting is such that the image 102b of the black spot 102a on the shooting aperture surface covers the entire shooting apertures 31b and 31c as shown in FIG. 8B during stereo shooting. Formed.

  Returning to FIG. 1, an anterior ocular lens 30 is detachably disposed in the optical path between the objective lens 24 and the perforated total reflection mirror 23, and the anterior ocular segment Ep is used for alignment in the anterior ocular segment. An infrared light source 27 that illuminates with infrared light, and a light source 28 that illuminates the anterior eye portion with weak white light are arranged for photographing the anterior eye portion.

  The fundus camera is provided with a focus index projection optical system. In this projection optical system, the index light from the focus index light source 50 composed of an infrared LED passes through the lens 51, the mirror 52, and the lens 53, and the optical path is set by the reflecting prisms 32d and 32e fixed to the moving diaphragm unit 32. Divided into two and projected onto the fundus Er. When the focusing lens 35 is moved for focus adjustment, the position of the lens 53 is moved in conjunction therewith, and the separation state of the image of the focus index reflected by the reflecting prisms 32d and 32e changes. Moves the focusing lens 35 so that the index images match, and focuses on the fundus.

  An exciter filter 18 is inserted into the optical path of the illumination optical system during fluorescence imaging, and a barrier filter 34 is inserted into the eye to be examined of the focusing lens 35 during fluorescence imaging. Further, in order to fix the eye to be examined with respect to the fundus camera, an internal fixation lamp 55 including a plurality of fixation lamps 55a to 55d is provided.

  An image of the fundus or anterior segment captured by the CCD 40 is input to a control calculation unit 60 constituted by a CPU or the like, and the image is displayed on the monitor 62 as a moving image. Further, a stereo monitor 63 is provided as a stereoscopic display, and the examiner can stereoscopically view the fundus by observing the left and right images taken in stereo through the stereo monitor 63.

  Further, the CCD 41 shoots the fundus illuminated by the strobe 15 as a still image when the shutter switch 66 is operated. This fundus image is temporarily stored in the high-speed memory 61 and recorded on a low-speed hard disk (HDD) 64 as an external recording device via the control calculation unit 60 or displayed on the monitor 62 and the stereo monitor 63.

  Also, input means such as a keyboard 67 and a mouse 68 are provided, and various data can be input via these input means.

  Further, the fundus camera is provided with a control unit 65 composed of a CPU or the like. The control unit 65 is connected to the control calculation unit 60 to exchange signals with each other, and returns when the shutter switch 66 is operated. The mirror 39 is removed from the optical path, and the strobe 15 is caused to emit light with an appropriate amount of light. The control unit 65 controls insertion / removal of the visible light cut infrared light transmission filter 13, the exciter filter 18, the barrier filter 34, the anterior ocular lens 30, and the variable power lenses 38a and 38b into / from the optical path. The movement of 32, the movement of the movable light shielding plate 19, and the movement of the black spot plate 102 for stereo photography are controlled.

  The fundus camera is provided with an operation unit 69. The operation unit 69 includes a shooting mode selection switch for selecting a shooting mode for normal shooting (monocular shooting), stereo shooting, and three-shot continuous shooting, and an anterior eye lens. An insertion / removal switch, a shooting position selection switch, and the like are arranged, and each switch information selected by the operation unit 69 is input to the control unit 65.

  Further, the fundus camera is provided with a left and right eye detection unit 70 that detects whether the subject eye to be photographed is the left eye or the right eye, and information on whether the detected left eye or right eye is detected is input to the control unit 65.

  In such a configuration, when the normal shooting mode for shooting the fundus as a single image is set, the movable aperture unit 32 is moved to the position shown in FIG. 3A, the imaging aperture 31a is selected, and The illumination stop is moved to the position shown in FIG. 5A, and the light shielding portion 19a becomes the illumination stop that comes to the center of the opening a of the fixed stop 20. Further, as shown in FIG. 6B, the black spot plate 102 is separated from the optical path, and the black spot 101a becomes effective. This state is shown in the “normal shooting” column of FIG.

  The anterior segment alignment is performed while observing the anterior segment image of the anterior segment illuminated by the light source 27 by the CCD 40 on the monitor 62, and when this is completed, the anterior segment lens 30 is detached from the optical path and passes through the illumination diaphragm. The light from the fundus illuminated with infrared light passes through the hole 23a of the perforated total reflection mirror 23 and the photographing aperture 31a, and is imaged on the CCD 40. The image is displayed on the monitor 62. Thus, the examiner observes the fundus image to perform alignment, and operates the focusing lens 35 to perform focus adjustment.

  When fundus alignment and focus adjustment are completed, the shutter switch 66 is operated, the return mirror 39 is removed from the optical path, and the strobe 15 emits light.

  The fundus image illuminated by the light emission of the strobe 15 passes through the focusing lens 35, the imaging lens 36, and the variable magnification lens 38a via the photographing aperture 31a, and is imaged on the CCD 41, thereby obtaining the fundus image. At this time, as shown in FIG. 8A, the image 101b of the black spot 101a on the imaging aperture surface covers the entire imaging aperture 31a, and the imaging light reflected by the objective lens 24 is reflected by the imaging aperture 31a. Can be prevented, and the quality of the photographed fundus image can be improved.

  On the other hand, when the stereo shooting (stereoscopic shooting) mode is set, two right and left fundus images for stereoscopic viewing are continuously shot by one shutter operation. When photographing the right image, the moving diaphragm unit 32 is moved to the position shown in FIG. 3B, the photographing diaphragm 31b is selected, and the illumination diaphragm is located at the position shown in FIG. 5B. And the light shielding portion 19b becomes an illumination stop that enters the opening a of the fixed stop 20. Further, the black spot plate 102 is inserted into the optical path of the illumination optical system as shown in FIG. This state is shown in the column “Stereo shooting (for right image)” in FIG.

  On the other hand, when the left image for stereoscopic viewing is shot, the moving aperture unit 32 is moved to the position shown in FIG. 3C, the shooting aperture 31c is selected, and the illumination aperture is shown in FIG. It is moved to the position shown in C), and the light shielding portion 19 c becomes an illumination stop entering the opening a of the fixed stop 20. The black spot plate 102 is inserted in the optical path of the illumination optical system as shown in FIG. This state is shown in the column “Stereo shooting (for left image)” in FIG.

  For example, when the right image is first taken and then the left image is taken, when the shutter switch 66 is operated after the fundus alignment and focus adjustment are completed, the strobe emits light, and “stereo shooting (for right image) in FIG. The first shooting is performed with the illumination diaphragm, the photographing aperture, and the black dot plate shown in the column “,” and then the illumination diaphragm, the photographing shown in the “stereo shooting (for left image)” column in FIG. A strobe light is emitted from the aperture and the black spot plate, and a second image is taken. In any shooting, the image 102b of the black spot 102a on the shooting diaphragm surface covers the entire shooting diaphragms 31b and 31c as shown in FIG. 8B, and the shooting light reflected by the objective lens surface. Can be prevented from passing through the photographing apertures 31b and 31c, and the quality of each fundus image can be improved.

  In this embodiment, a three-frame continuous shooting mode can also be set. In this mode, three images are continuously shot with a single shutter operation. The first image is the same as that for normal shooting, and the second and third images are the right and left fundus images for stereoscopic viewing.

  Note that the photographed monocular image of the fundus and the two right and left fundus images for stereoscopic viewing are the eye ID to be examined, the photographing date and time, the photographing light amount (strobe emission amount), the distinction between the left and right eyes, and the position of the photographing aperture ( In association with the imaging conditions such as the first to third positions), it is once recorded in the memory 61, then transferred to the external storage device 64 at a predetermined timing, and stored there.

  When an image recorded in the memory 61 or the external recording device 64 is called up and displayed, the display method and display means (monitor) are changed according to the shooting mode. For example, when displaying a monocular fundus image captured by normal imaging, the monitor 62 is automatically selected, and the fundus image is displayed on the monitor 62 with imaging condition information as a still image. When the left and right images obtained by stereo shooting are called up to stereoscopically view the fundus, the stereo monitor 63 is used to display the left image with the left position information on the left side and the right position. The right image with the information is arranged on the right side, and the other shooting condition information is also displayed. On the other hand, when calling and displaying three images obtained by three consecutive shooting, the monitor 62 is used to repeatedly display the three images one by one. By this repeated display, a kind of moving image stereoscopic image is displayed.

  In the following, other embodiments for forming black spots for normal photography and stereo photography will be described. In each of the following embodiments, the movement of the black spot plate when a predetermined photographing aperture is selected is performed under the control of the control unit 65.

  In the embodiment shown in FIG. 6, the stereo shooting black spot plate 102 slides in parallel with the normal shooting black spot plate 101 during normal shooting and is detached from the optical path of the illumination optical system, as shown in FIG. A rotating shaft 104 is provided at the left end of the stereo shooting black spot plate 102. During normal shooting, as shown in FIG. 9B, the stereo shooting black spot plate 102 is centered on the rotating shaft 104 as a normal shooting black spot. You may make it rotate about 90 degree | times with respect to the board 101, and you may make it detach | leave from the optical path of an illumination optical system.

  In the embodiment shown in FIGS. 6 and 9, the small black spot 101a is activated when the photographing aperture 31a is selected, and the large black spot 102a is activated when the photographing apertures 31b and 31c are selected. The size of the black spot changes according to the position of. At this time, the shape or number of black spots formed on the black spot plate for stereo photography 102 can be changed. For example, the example shown in FIG. 13A is an example in which a circular black spot 102a is formed on the stereo shooting black spot plate 102, as shown in FIGS. As shown in FIG. 13B, a rectangular black point 102c or two separated circular black points 102d and 102e can be formed as shown in FIG. 13C. In any of the black spot shapes, when the black spot plate 102 is inserted into the optical path during stereo shooting, the images of the black dots 102c, 102d, and 102e on the shooting diaphragm surface cover the shooting diaphragms 31b and 31c, and the objective lens. Needless to say, the size of the photographing light reflected by the surface is set so as to prevent the photographing light from passing through the photographing diaphragms 31b and 31c.

  FIG. 10 shows an example in which the stereo shooting black spot plate 102 can be moved along the optical axis 100 of the illumination optical system while being guided by the left and right guide rails 105 and 106. In this embodiment, when the photographing apertures 31b and 31c are selected at the time of stereo photographing, the black spot plates 101 and 102 are as shown in FIG. A) occupies the same position as in A), and on the other hand, when the photographing aperture 31a is selected during normal photographing, the black spot 101a is fixed and the black spot 102a is objective along the optical axis 100 of the illumination optical system, for example, about 10 mm. Move to the lens 24 side. By this movement, the black spot 102a is invalidated, and only the black spot 101a becomes valid, and the photographing light reflected by the objective lens surface is prevented from passing through the photographing aperture 31a.

  In the example shown in FIG. 11, a black spot plate 111 formed around a circular black spot 111a and a black spot plate 112 formed around a black spot 112a having the same shape and size as the black spot 111a are arranged on the optical axis 100 of the illumination optical system. It can be moved in a direction perpendicular to the direction. When the photographing aperture 31a is selected during normal photographing, as shown in FIG. 11B, the black spot plate 111 abuts on the convex part 114a of the stopper 114, and the black spot board 112 is the convex part of the stopper 113. The black spots 111a and 112a are in contact with the optical axis 100 and are positioned so as to coincide with the optical axis 100 and overlap each other. On the other hand, when the photographing apertures 31b and 31c are selected during stereo shooting, as shown in FIG. 11A, the black dot plate 111 moves to the left and comes into contact with the concave portion 113b of the stopper 113, so that the black dot The plate 112 moves to the right and comes into contact with the recess 114b of the stopper 114. In this state, two separated black spots 111 a and 112 a having the same size are located at equal distances across the optical axis 100. The size of each of the black spots 111a and 112a is such that the image of each black spot at the imaging aperture covers the entire selected imaging aperture, so that the imaging light reflected by the objective lens surface is It is possible to prevent passing through the photographing aperture.

  In the example shown in FIG. 12, one black spot plate 120 formed with a circular black spot 120a in the center is moved left and right in a direction perpendicular to the optical axis 100 of the illumination optical system. In the state shown on the left in FIG. 12, the center of the black point 120a coincides with the optical axis 100, and is the one when the photographing aperture 31a is selected in the normal photographing, and the image 120b of the black point 120a at the photographing aperture 31a. As shown in the lower left, the entire photographing aperture 31a is covered. In the state shown in the center of FIG. 12, when the photographing aperture 31b is selected in stereo photography, the black spot plate 120 moves to the left from the optical axis 100, and at this time, the black spot 120a at the photographing aperture 31b. This image 120b covers the entire photographing aperture 31b as shown in the lower center. In the state shown on the right in FIG. 12, when the photographing aperture 31c is selected in stereo photography, the black spot plate 120 moves to the right from the optical axis 100, and at this time, the black spot 120a at the photographing aperture 31c. The image 120b covers the entire photographing aperture 31c as shown on the lower right. In any case, the photographing light reflected by the objective lens surface can be prevented from passing through the photographing diaphragms 31a, 31b, and 31c, the reflection by the objective lens can be prevented, and the quality of the fundus image can be improved. Needless to say, the shape of the black spot 120a is not circular but may be other shapes such as a rectangle.

It is the block diagram which showed the optical system of the fundus imaging apparatus of this invention. (A) is a plan view showing a configuration of a moving aperture unit, (B) is a plan view showing a configuration of a fixed aperture, and (C) is a plan view showing a configuration of a perforated total reflection mirror. It is explanatory drawing explaining the state by which a photography aperture is selected by the movement of a moving aperture unit. It is explanatory drawing which showed in detail the path | route of the light ray which passes an imaging aperture_diaphragm | restriction. It is explanatory drawing which showed switching of an illumination stop. It is explanatory drawing which showed the Example which changes a black spot according to imaging | photography mode. It is explanatory drawing which showed the black spot plate selected by each imaging | photography mode, an imaging | photography aperture stop, and an illumination aperture. It is explanatory drawing which showed the image of the black spot on an imaging stop surface. It is explanatory drawing which showed the other Example which changes a black spot according to imaging | photography mode. It is explanatory drawing which showed the other Example which changes a black spot according to imaging | photography mode. It is explanatory drawing which showed the other Example which changes a black spot according to imaging | photography mode. It is explanatory drawing which showed the other Example which changes a black spot according to imaging | photography mode. It is explanatory drawing which showed the example which changes a black spot shape or a number.

Explanation of symbols

DESCRIPTION OF SYMBOLS 15 Strobe 21 Ring slit 23 Perforated total reflection mirror 30 Anterior eye lens 31 Fixed aperture 31a, 31b, 31c Imaging aperture 32 Moving aperture unit 50 Focus indicator light source 55 Internal fixation lamp 101 Black spot plate for normal shooting 102 Black spot for stereo shooting Board

Claims (6)

An illumination optical system for illuminating the eye fundus of the eye to be examined through an objective lens;
A black spot plate disposed in the illumination optical system to remove harmful light based on surface reflection of the objective lens;
An imaging optical system that guides light from the fundus of the subject's eye that has passed through the objective lens to the image sensor via the imaging aperture;
Selecting means for selecting a photographing aperture at a different position;
A fundus photographing apparatus, wherein at least one of the position, shape, size, and number of black spots on the black spot plate is changed in accordance with the photographing aperture selected by the selection means.   The fundus imaging apparatus according to claim 1, wherein a plurality of the black spots are provided, and at least one black spot is moved in the optical axis direction of the illumination optical system or in a direction orthogonal to the optical axis to be invalidated. .   The fundus imaging apparatus according to claim 1, wherein a plurality of the black spots are provided, and the positions of at least two black spots overlap each other when viewed from the optical axis direction of the illumination optical system, depending on the position of the photographing aperture.   The black spot plate is provided when an imaging aperture is provided at the first, second, and third positions, and when the imaging aperture at the first position is selected and when the imaging aperture at another position is selected. 4. The fundus imaging apparatus according to claim 1, wherein at least one of a position, a shape, a size, and a number of black spots arranged on the fundus is changed.   When the photographic aperture is at a position other than the first position, continuous shooting is performed by sequentially switching the position of the photographic aperture without switching the state of the black spot plate in one shooting operation. The fundus imaging apparatus according to claim 4.   When the normal shooting mode is set and the normal shooting mode is set, the shooting aperture at the first position is selected, and when the stereo shooting mode is set, the second or third position is set. The fundus imaging apparatus according to claim 4, wherein an imaging aperture is selected.

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