Ophthalmic apparatus and aperture mirror

Abstract

An ophthalmic apparatus comprising: an aperture mirror provided at a position where an illumination optical system connects to an imaging optical system, the aperture mirror having a reflective surface capable of reflecting illumination light toward an eye under examination and a hole through which return light from the eye passes; and an apertured part provided on the reflective surface, the apertured part having a transmission opening through which the return light passes.

Description

Ophthalmic equipment and speculum

[0001] The present invention relates to an ophthalmic apparatus equipped with a hole speculum and a hole speculum.

[0002] An ophthalmic apparatus for photographing the fundus of a subject's eye is known. This ophthalmic apparatus includes an objective lens, an illumination optical system that emits illumination light, and an imaging optical system that guides return light from the subject's eye illuminated by the illumination light through the objective lens to an imaging device. The illumination optical system of the ophthalmic apparatus is connected midway through the imaging optical system. The illumination light emitted from this illumination optical system is incident on the subject's eye via a part of the imaging optical system and the objective lens (see Patent Document 1: JP 2024-024812 A). For this reason, a hole mirror is provided at the position where the illumination optical system connects to the imaging optical system to reflect the illumination light incident from the illumination optical system toward the objective lens and to transmit or transmit the return light from the subject's eye.

[0003] In such ophthalmic devices, if reflected or scattered light returning from the cornea and crystalline lens is guided to the photographing optical system, it can cause flare in the photographed image of the fundus. Therefore, for example, the perforated mirror described in Patent Document 1 is composed of a plate-shaped transparent member and a reflective film formed (by vapor deposition) on the surface of this transparent member. This reflective film has a circular opening when viewed from the optical axis direction of the photographing optical system. This opening functions as a photographing diaphragm. This eliminates the need to separately attach a cylindrical photographing diaphragm to the perforated mirror, preventing reflection or scattering of returned light on the inner wall surface of this photographing diaphragm. As a result, the occurrence of flare can be suppressed.

[0004] In the hole mirror described in Patent Document 1, the returning light passes through the transparent member through the opening in the reflective film, which may result in multiple reflections of the returning light on the front and back surfaces of the transparent member. As a result, there is still a risk of flare occurring in the captured image. Furthermore, in the hole mirror described in Patent Document 1, the illumination light incident from the illumination optical system is reflected toward the subject's eye (objective lens) by the entire area of ​​the reflective film excluding the opening, which may result in excess illumination light entering the subject's eye. In this case, there is also a risk of flare occurring in the captured image.

[0005] The present disclosure has been made in view of the above circumstances, and has an object to provide an ophthalmic apparatus and a borescope that can further suppress the occurrence of flare.

[0006] The ophthalmic apparatus disclosed herein comprises an illumination optical system and an imaging optical system, in which the illumination optical system causes illumination light to be incident on the subject's eye through a part of the imaging optical system, and the imaging optical system directs returned light from the subject's eye onto which the illumination light has been incident to an imaging device.The ophthalmic apparatus comprises: a hole mirror provided at a position where the illumination optical system is connected to the imaging optical system, the hole mirror having a reflective surface capable of reflecting illumination light incident from the illumination optical system towards the subject's eye and a hole portion through which the returned light passes; and a perforated portion provided on the reflective surface and having a passing opening through which the returned light passes.

[0007] According to the ophthalmic apparatus and the hole mirror of the present disclosure, the occurrence of flare can be further suppressed.

[0008] 1 is a schematic diagram showing an example of the configuration of an optical system of an ophthalmic device; FIG. 2 is a diagram showing an example of an attachment structure of a hole mirror; 3A is a front view of the hole mirror as seen from one side in the Z direction, 3B is a cross-sectional view of the hole mirror, and 3C is a rear view of the hole mirror as seen from the other side in the Z direction; 3B is an enlarged cross-sectional view of the hole mirror; 3C is a front view of the hole mirror as seen from the normal direction of the reflecting surface; 3D is an explanatory diagram for explaining the inclination angle of the inner wall surface of the hole with respect to the optical axis of the photographing optical system; 3E is an explanatory diagram for explaining the angle of incidence of return light incident on the hole mirror from the objective lens; 3F is an explanatory diagram for explaining modified examples of the hole of the hole mirror; 3G is an explanatory diagram for explaining the angle of incidence of return light incident on the hole mirror from the objective lens; 3H is an explanatory diagram for explaining modified examples of the hole of the hole mirror; 3J is an explanatory diagram for explaining the angle of incidence of return light incident on the hole mirror from the objective lens; 3J is an explanatory diagram for explaining modified examples of the hole of the hole mirror; 3J is an explanatory diagram for explaining the angle of incidence of return light incident on the hole mirror ... the angle of incidence of return light incident on the hole mirror; 3J is an explanatory diagram for explaining modified examples of the hole of the hole mirror; 3J is an explanatory diagram for explaining the angle of incidence of return light incident on the hole mirror; 3J is an explanatory diagram for explaining the angle of incidence of return light incident on the hole mirror; 3J is an explanatory diagram

[0009] Fig. 1 is a schematic diagram showing an example of the configuration of an optical system of an ophthalmic apparatus 10. Of the mutually orthogonal X, Y, and Z directions in Fig. 1, the Z direction is the direction of the main optical axis of the ophthalmic apparatus 10 (the direction of an optical axis OB described below), the X direction is the left-right direction relative to the subject or examiner, and the Y direction is the up-down direction.

[0010] 1, an ophthalmic apparatus 10 photographs the fundus Ef of the subject's eye E using a known slit scan method (see Patent Document 1). The ophthalmic apparatus 10 includes a light source 11, an illumination optical system 12, an imaging optical system 20 including an objective lens 18, and an imaging device 24. Note that the symbol OA indicates the optical axis of the illumination optical system 12, and the symbol OB indicates the optical axis of the imaging optical system 20 (objective lens 18).

[0011] The light source 11 is disposed at a position optically non-conjugate with the fundus Ef and the iris, and emits illumination light. Note that the light source 11 and the type of illumination light are not particularly limited (see, for example, Patent Document 1).

[0012] The illumination optical system 12 is connected midway through the photographic optical system 20, which will be described later, and guides illumination light emitted from the light source 11 to a hole mirror 21 of the photographic optical system 20. The illumination optical system 12 includes an iris diaphragm 13, a slit aperture diaphragm 14, a relay lens 15, an optical scanner 16, and a relay lens 17.

[0013] The iris diaphragm 13 is disposed, for example, at a position that is approximately optically conjugate with the iris (pupil) of the subject's eye E. The iris diaphragm 13 has one or more openings formed therein that allow the illumination light emitted from the light source 11 to pass through.

[0014] The slit aperture diaphragm 14 is disposed at a position that is approximately optically conjugate with the fundus Ef. A slit is formed in the slit aperture diaphragm 14. Illumination light that passes through the slit aperture diaphragm 14 becomes, for example, slit-shaped illumination light (slit light) parallel to the X direction at the fundus position (or fundus conjugate position) when focused by an objective lens 18 (described later). The slit aperture diaphragm 14 is provided so as to be movable along the optical axis OA (optical path of the illumination light) by an actuator (not shown).

[0015] The relay lens 15 transmits the illumination light that has passed through the slit of the slit aperture stop 14 .

[0016] The optical scanner 16 is a deflection mechanism such as a galvanometer mirror, a resonant mirror, a polygon mirror, or a MEMS (Micro Electro Mechanical Systems), and is disposed at a position that is approximately optically conjugate with the iris of the subject's eye E. The optical scanner 16 one-dimensionally deflects (or two-dimensionally deflects) the illumination light that has passed through the relay lens 15 and guides it to the relay lens 17. During slit scan imaging, the optical scanner 16 deflects the illumination light (slit light) that is parallel to the X direction in the Y direction.

[0017] The relay lens 17 transmits the illumination light incident from the optical scanner 16. The illumination light that has transmitted through the relay lens 17 is incident on the hole mirror 21. As a result, the illumination light emitted from the light source 11 is guided to the hole mirror 21 by the illumination optical system 12, and then incident on the subject's eye E via part of the imaging optical system 20 (the hole mirror 21 and the objective lens 18).

[0018] The objective lens 18 irradiates a part of the fundus Ef with illumination light incident from the hole mirror 21 through the anterior segment Ea (pupil) of the subject's eye E. At this time, the illumination light is deflected in the Y direction by the optical scanner 16 described above, so that the fundus Ef is scanned in the Y direction with illumination light (slit light) parallel to the X direction. Then, while the illumination light is being scanned, return light from the fundus Ef illuminated by the illumination light enters the photographing optical system 20 (objective lens 18).

[0019] The photographing optical system 20 guides the returning light from the subject's eye E to the imaging device 24. The photographing optical system 20 includes an objective lens 18, a hole mirror 21, a focusing lens 22, and a lens 23 arranged along an optical axis OB.

[0020] Fig. 2 is a diagram showing an example of the mounting structure of the hole mirror 21. As shown in Fig. 2 and the above-described Fig. 1, the hole mirror 21 is provided at a position where the illumination optical system 12 connects to the photographic optical system 20. For example, in this embodiment, the optical path of the photographic optical system 20 is formed at one end of a cylindrical portion 27 that houses the relay lens 17 and the like. The hole mirror 21 is mounted to one end of the cylindrical portion 27 via a mounting plate 28 so that the hole mirror 21 is positioned in a predetermined orientation on the optical path of the photographic optical system 20.

[0021] The hole mirror 21 reflects the illumination light incident from the illumination optical system 12 (relay lens 17) toward the objective lens 18 (eye E to be inspected). As a result, as described above, the illumination light is incident on the eye E via the objective lens 18. The hole mirror 21 also has a hole 32 that passes the return light from the eye E to be inspected that has entered from the objective lens 18. Therefore, the return light passes through this hole 32 and enters the focusing lens 22. The detailed structure of the hole mirror 21 will be described later.

[0022] 1 , the position of the focusing lens 22 can be adjusted along the optical axis OB by a lens movement mechanism (not shown). This allows the returning light that has passed through the hole 32 to be imaged on the light receiving surface of an image sensor 25 of the imaging device 24 (described later). The lens 23 also transmits the returning light that has entered from the focusing lens 22. This allows the photographing optical system 20 to guide the returning light to the imaging device 24.

[0023] The imaging device 24 includes an imaging element 25 that receives the return light incident from the imaging optical system 20. The imaging element 25 has a light-receiving surface onto which the return light is incident. The imaging element 25 has a rolling shutter function that captures the return light while shifting the timing of the start and end of exposure for each region (including each pixel and each line) within its light-receiving surface. As a result, during slit scan imaging, the imaging element 25 uses the rolling shutter function to capture the return light of the illumination light moving within the fundus Ef and outputs an imaging signal of the return light to a control device (not shown) (see Patent Document 1 above). A captured image of the fundus Ef is then generated in this control device.

[0024] In Fig. 3, reference numeral 3A is a front view of the hole mirror 21 as seen from one side in the Z direction (the side of the objective lens 18), reference numeral 3B is a cross-sectional view of the hole mirror 21, and reference numeral 3C is a rear view of the hole mirror 21 as seen from the other side in the Z direction (the side of the focusing lens 22). Fig. 4 is an enlarged cross-sectional view of the hole mirror 21. Fig. 5 is a front view of the hole mirror 21 as seen from the normal direction of the reflecting surface 30.

[0025] As shown in Figures 3 to 5, the hole mirror 21 is formed in a substantially circular disk shape from glass, for example. One surface of the hole mirror 21 is a reflective surface 30 (mirror surface) that can reflect illumination light incident from the relay lens 17 of the illumination optical system 12 toward the objective lens 18. The hole mirror 21 also has the hole 32 (through hole) described above. The central axis C of the hole 32 is parallel to the normal direction of the reflective surface 30. The hole mirror 21 is attached to the tube portion 27 (see Figure 2) in an inclined position such that the central axis C of the hole 32 is inclined with respect to the optical axes OA and OB. The hole mirror 21 may also be formed from a material other than glass.

[0026] An entrance opening 32a, which is an opening on one side of the hole 32, is formed on the reflecting surface 30. An exit opening 32b, which is an opening on the other side of the hole 32, is formed on the back surface 31 opposite the reflecting surface 30 of the hole mirror 21.

[0027] The inner wall surface of the hole 32 is formed in a tapered shape in which the diameter D2 of the exit opening 32b is larger than the diameter D1 of the entrance opening 32a (see FIG. 4). The "tapered shape" here is not limited to a shape in which the inner diameter of the hole 32 increases continuously from the entrance opening 32a to the exit opening 32b, but also includes, for example, a shape in which the inner diameter of the hole 32 increases in stages (such as a staircase shape). The inclination angle θ of the inner wall surface of the hole 32 (see FIG. 6) will be described later.

[0028] The perforated mirror 21 has a mechanical mask 40 (corresponding to the perforated portion in this disclosure) which is a light-shielding mask that covers its reflecting surface 30. The mechanical mask 40 is made of any light-shielding material and has a thickness of, for example, 0.03 mm. The mechanical mask 40 has three adhesive holes 41, one light-passing hole 42 (corresponding to the light-passing opening in this disclosure), and two exposure windows 43 (also referred to as exposure openings).

[0029] The three adhesive holes 41 are formed at any position facing the reflecting surface 30 (a position not facing the entrance opening 32a). An adhesive (not shown) is poured into each adhesive hole 41. This adhesively fixes the mechanical mask 40 to the reflecting surface 30. The number of adhesive holes 41 is not limited to three, and may be one, or four or more. Furthermore, the method of fixing the mechanical mask 40 to the reflecting surface 30 is not limited to adhesive fixation, and any fixing method may be used.

[0030] The light passing hole 42 is formed at a position opposite the entrance opening 32a, and its center coincides (or substantially coincides, the same applies below) with the central axis C. As a result, the return light incident on the hole mirror 21 from the objective lens 18 passes through the light passing hole 42 and the hole portion 32 in order.

[0031] The light passing hole 42 has an elliptical shape when viewed from the front of the tilted hole mirror 21, i.e., when viewed from the normal direction of the reflecting surface 30 (the axial direction of the central axis C) (see FIG. 5). When viewed from the optical axis direction of the optical axis OB, the light passing hole 42 has a circular shape, for example, with a diameter of 2.3 mm (see FIG. 3). The circular shape here refers to a perfect circle or a nearly perfect circle. This allows the light passing hole 42 to function as a photographic aperture.

[0032] In this way, the light passing hole 42 functions as a photographic diaphragm, eliminating the need to separately attach a cylindrical photographic diaphragm to the hole mirror 21, and preventing reflection or scattering of returning light on the inner wall surface of this cylindrical photographic diaphragm. As a result, the occurrence of flare (hereinafter simply referred to as flare) in photographed images of the fundus oculi Ef can be suppressed.

[0033] The hole diameter D3 (aperture diameter) of the light passing hole 42 is formed to be slightly smaller than the opening diameter D1 of the entrance opening 32a. Therefore, when the hole mirror 21 is viewed from the normal direction of the reflecting surface 30, the opening edge (edge) of the entrance opening 32a is covered by the opening edge of the light passing hole 42, i.e., the mechanical mask 40. This makes it possible to ease the precision required for position adjustment when fixing the mechanical mask 40 to the reflecting surface 30.

[0034] Furthermore, when the hole 32 is formed in the glass hole mirror 21 by tapering, it is difficult to eliminate chips and nicks that occur at the edge of the entrance aperture 32a. Therefore, by covering the edge of the entrance aperture 32a with a mechanical mask 40, unnecessary reflection and scattering of returning light at this opening edge can be prevented. As a result, the occurrence of flare can be suppressed.

[0035] The two exposure windows 43 expose two predetermined reflection regions 30a of a portion of the reflection surface 30. As a result, the reflection surface 30 reflects the illumination light incident from the illumination optical system 12 toward the objective lens 18 only at each reflection region 30a. This prevents excess illumination light from entering the subject's eye E, compared to when the illumination light is reflected from the entire surface (almost the entire surface) of the reflection surface 30. As a result, the occurrence of flare can be suppressed. The number of exposure windows 43 is not limited to two, and may be one, three, or more. The shape and size of the exposure windows 43 can also be changed as appropriate.

[0036] Fig. 6 is an explanatory diagram for explaining the inclination angle θ of the inner wall surface of the hole 32 with respect to the optical axis OB of the photographing optical system 20. Fig. 7 is an explanatory diagram for explaining the incident angle (φ / 2ω) of the return light (denoted by the symbol L) incident on the hole mirror 21 from the objective lens 18.

[0037] 6 and 7, the tilt angle θ is larger than the angle of incidence of the returning light that enters the hole mirror 21 from the objective lens 18. Specifically, if the photographing angle of view of the objective lens 18 is "φ" and the lateral magnification of the objective lens 18 (in FIG. 7, the state where the objective lens 18 is focused on the pupil) is "ω", the angle of incidence of the returning light is expressed as (φ / 2ω), and therefore the tilt angle θ satisfies the following formula 1.

[0038]

[0039] By adjusting the tilt angle θ so as to satisfy the above formula (1), the return light incident on the hole mirror 21 from the objective lens 18 is prevented from being incident on the inner wall surface of the hole 32. As a result, the return light is prevented from being reflected and scattered on the inner wall surface of the hole 32, and the occurrence of flare can be suppressed.

[0040] As described above, in this embodiment, the occurrence of flare is suppressed by covering the reflective surface 30 with the mechanical mask 40, causing the light passage hole 42 of the mechanical mask 40 to function as a photographic aperture, forming the hole diameter of the light passage hole 42 to be smaller than the opening diameter of the incident opening 32a, and further reflecting illumination light only from the reflective region 30a, which is a part of the reflective surface 30. Furthermore, in this embodiment, the occurrence of flare is suppressed by adjusting the inclination angle θ of the inner wall surface of the hole 32 so as to satisfy the above-mentioned [Equation 1]. As a result, the occurrence of flare is suppressed in this embodiment more than in the past.

[0041] 8 is an explanatory diagram illustrating a modified example of the hole 32 of the hole mirror 21. In the above embodiment, the central axis C of the hole 32 is parallel to the normal direction of the reflecting surface 30, i.e., non-parallel (including substantially parallel, the same applies below) to the optical axis OB. Therefore, in the above embodiment, in a cross section of the hole 32 taken along any plane including the optical axis OB, the inclination angle θ of one of the inner wall surfaces (cross-sectional contour lines) of the hole 32 relative to the optical axis OB and the inclination angle θ of the other inner wall surface (cross-sectional contour lines) of the hole 32 relative to the optical axis OB are asymmetric (non-identical) (see FIG. 6 ).

[0042] 8, the central axis C of the hole 32 may be inclined with respect to the normal direction of the reflecting surface 30 and made parallel to the optical axis OB. In this case, in a cross section of the hole 32 taken along any plane including the optical axis OB, the inclination angle θ of one of the inner wall surfaces of the hole 32 with respect to the optical axis OB and the inclination angle θ of the other inner wall surface of the hole 32 with respect to the optical axis OB are symmetrical (identical). However, considering the ease of forming the hole 32 in the hole mirror 21, it is preferable to form the hole 32 so that the central axis C is parallel to the normal direction of the reflecting surface 30.

[0043] [Others] In the above embodiment, the mechanical mask 40 is provided on the reflecting surface 30 of the perforated mirror 21, but various light-shielding masks other than the mechanical mask 40 (including light-shielding films such as vapor-deposited films, coating films, and surface-treated films) may be provided on the reflecting surface 30. Furthermore, the perforated portion having an opening (light-transmitting area) equivalent to the light-passing hole 42 (and exposure window 43) and the perforated mirror 21 may be integrally formed.

[0044] In the above embodiment, an ophthalmic device 10 (fundus camera) that photographs the fundus Ef using a slit scan method has been described as an example, but the present disclosure can also be applied to fundus cameras and their combined devices that photograph the fundus Ef using other methods. Furthermore, the present disclosure is not limited to fundus cameras, but can be applied to various known ophthalmic devices that are equipped with a hole mirror.

[0045] Some or all of the above-described embodiments can be described as, but are not limited to, the following supplementary notes.

[0046] [Supplementary Item 1] An ophthalmic device comprising an illumination optical system and a photographing optical system, wherein the illumination optical system causes illumination light to be incident on a subject's eye via a part of the photographing optical system, and the photographing optical system directs return light from the subject's eye onto which the illumination light has been incident to an imaging device, the ophthalmic device comprising: a hole mirror provided at a position where the illumination optical system is connected to the photographing optical system, the hole mirror having a reflective surface that can reflect the illumination light incident from the illumination optical system towards the subject's eye, and a hole portion through which the return light passes; and a perforated portion provided on the reflective surface, having a passage opening through which the return light passes.

[0047] According to the ophthalmic apparatus described in Supplementary Item 1, the occurrence of flare can be suppressed by making the passage opening function as a photographing diaphragm.

[0048] [Supplementary Item 2] The ophthalmic device according to Supplementary Item 1, wherein the passage opening has an elliptical shape when viewed from a normal direction of the reflecting surface and a circular shape when viewed from an optical axis direction of the photographing optical system, thereby allowing the passage opening to function as a photographing diaphragm.

[0049] [Supplementary Item 3] The ophthalmic device according to Supplementary Item 1 or 2, wherein the passage opening is smaller than the opening of the hole formed in the reflecting surface, thereby preventing reflection and scattering of returning light at the periphery of the opening of the hole, thereby suppressing the occurrence of flare.

[0050] [Supplementary Item 4] An ophthalmic device according to any one of Supplementary Items 1 to 3, wherein when the opening of the hole formed on the reflecting surface is an entrance opening and the opening of the hole formed on the surface of the hole mirror opposite the reflecting surface is an exit opening, the inner wall surface of the hole has a tapered shape such that the opening diameter of the exit opening is larger than the opening diameter of the entrance opening.

[0051] [Supplementary Item 5] The ophthalmic device according to Supplementary Item 4, wherein the angle of inclination of the inner wall surface with respect to the optical axis of the photographing optical system is larger than the angle of incidence of the returning light incident on the hole mirror, thereby preventing reflection and scattering of the returning light on the inner wall surface of the hole, thereby suppressing the occurrence of flare.

[0052] [Supplementary Item 6] The ophthalmic device according to any one of Supplementary Items 1 to 5, wherein the central axis of the hole is approximately parallel to the normal direction of the reflecting surface, thereby improving the workability of the hole.

[0053] [Supplementary Item 7] The ophthalmologic apparatus according to any one of Supplementary Items 1 to 5, wherein the central axis of the hole is inclined with respect to the normal direction of the reflecting surface and is approximately parallel to the optical axis direction of the imaging optical system.

[0054] [Supplementary Item 8] The ophthalmic apparatus according to any one of Supplementary Items 1 to 7, wherein the perforated mirror and the perforated portion are integrally formed.

[0055] [Supplementary Item 9] In an ophthalmic device comprising an illumination optical system and a photographing optical system, wherein the illumination optical system causes illumination light to be incident on a subject's eye via a part of the photographing optical system, and the photographing optical system directs return light from the subject's eye onto which the illumination light has been incident to an imaging device, a hole mirror provided at a position where the illumination optical system is connected to the photographing optical system, the hole mirror comprising: a reflective surface capable of reflecting the illumination light incident from the illumination optical system towards the subject's eye; a hole portion through which the return light passes; and a perforated portion provided on the reflective surface and having a passage opening through which the return light passes.

[0056] DESCRIPTION OF SYMBOLS 10...Ophthalmic apparatus 11...Light source 12...Illumination optical system 13...Iris diaphragm 14...Slit aperture diaphragm 15...Relay lens 16...Optical scanner 17...Relay lens 18...Objective lens 20...Photographing optical system 21...Hole mirror 22...Focusing lens 23...Lens 24...Imaging device 25...Imaging element 27...Cylindrical portion 28...Mounting plate 30...Reflecting surface 30a...Reflecting area 31...Back surface 32...Hole portion 32a...Inlet opening 32b...Outlet opening 40...Mechanical mask 41...Adhesion hole 42...Light passing hole 43...Exposure window C...Central axis D1, D2...Aperture diameter D3...Hole diameter E...Eye to be examined Ea...Anterior segment Ef...Fundus OA, OB...Optical axis θ...Tilt angle

Claims

1. An ophthalmic device comprising an illumination optical system and a photographing optical system, wherein the illumination optical system causes illumination light to be incident on a subject's eye via a part of the photographing optical system, and the photographing optical system directs return light from the subject's eye onto which the illumination light has been incident to an imaging device, the ophthalmic device comprising: a hole mirror provided at a position where the illumination optical system is connected to the photographing optical system, the hole mirror having a reflective surface capable of reflecting the illumination light incident from the illumination optical system towards the subject's eye and a hole through which the return light passes; and a perforated portion provided on the reflective surface and having a passage opening through which the return light passes.

2. An ophthalmic apparatus according to claim 1, wherein the passage opening has an elliptical shape when viewed in the normal direction of the reflecting surface and a circular shape when viewed in the optical axis direction of the photographing optical system.

3. An ophthalmic apparatus according to claim 1, wherein the passage opening is smaller than the opening of the hole formed in the reflecting surface.

4. An ophthalmic device as described in claim 1, wherein when the opening of the hole formed on the reflecting surface is an entrance opening and the opening of the hole formed on the surface of the hole mirror opposite the reflecting surface is an exit opening, the inner wall surface of the hole has a tapered shape such that the opening diameter of the exit opening is larger than the opening diameter of the entrance opening.

5. An ophthalmic apparatus according to claim 4, wherein the angle of inclination of said inner wall surface with respect to the optical axis of said photographing optical system is larger than the angle of incidence of said returning light incident on said hole mirror.

6. An ophthalmic device according to any one of claims 1 to 5, wherein the central axis of the hole is approximately parallel to the normal direction of the reflecting surface.

7. An ophthalmic apparatus according to any one of claims 1 to 5, wherein the central axis of the hole is inclined with respect to the normal direction of the reflecting surface and is approximately parallel to the optical axis direction of the photographing optical system.

8. An ophthalmic device according to any one of claims 1 to 5, wherein the perforated mirror and the perforated portion are integrally formed.

9. In an ophthalmic device comprising an illumination optical system and a photographing optical system, wherein the illumination optical system causes illumination light to be incident on the subject's eye via a part of the photographing optical system, and the photographing optical system directs return light from the subject's eye onto which the illumination light has been incident to an imaging device, a hole mirror provided at a position where the illumination optical system is connected to the photographing optical system, the hole mirror comprising: a reflective surface capable of reflecting the illumination light incident from the illumination optical system towards the subject's eye; a hole portion through which the return light passes; and a perforated portion provided on the reflective surface and having a passage opening through which the return light passes.

Images