JPH0928677A - Black point plate for ophthalmology apparatus and ophthalmology apparatus using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a black point plate having a simple construction to prevent generation of scattered light and also of reflection at the edge part of the black point plate causing flare or ghost generation and an ophthalmological apparatus using the same. SOLUTION: A black coating layer forming small black point 33 is formed between a plurality of transparent glass plates 30 and 31 through which superimposed light on each other is transmittable and further the surroundings of the small black point 33 are filled with an adhesive having the same refractive index as those of the transparent glass plates 30 and 31 and the black coating layer forming the small black point 33 or an adhesive having similar refractive index as those of the transparent glass plates 30 and 31 and the black coating layer forming the small black point and capable of transmitting light, and also the glass plates 30 and 31 are adhered to and fixed with each other with the adhesive and the ophthalmological apparatus uses the black point plate.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a black spot plate for an ophthalmologic apparatus used in an ophthalmologic apparatus used for observing and photographing an eye to be examined, and an ophthalmologic apparatus using the same.

[0002]

2. Description of the Related Art An ophthalmologic apparatus of this type is, for example, a fundus camera. In this fundus camera, an illuminating light of an illuminating light source of an illuminating system is projected from an objective lens onto an eye to be inspected, and reflected light from the eye to be inspected is guided to the observing means and the photographic means via the objective lens and photographic diaphragm, respectively. Also, it is usual to have a photographing system.

In such a fundus camera, the reflected light from the surface of the objective lens mixes into the photographing optical system as harmful light and causes flare and ghost, so that clear observation and photographing of the fundus cannot be performed.

Conventionally, in order to remove such harmful light,
As disclosed in JP-B-60-57852 and JP-B-61-97, when the lens surface of the objective lens is considered to be a reflecting surface, an illumination system conjugate with the position where the image of the photographing diaphragm is formed. It has been considered to provide a small black dot at the position for covering the image of the aperture of the photographing diaphragm. There may be a case where a plurality of small black dots are provided depending on the shape of the objective lens.

The small black dots are formed, for example, by disposing a black dot plate 61 as shown in FIG. 8A in the middle of the optical path of the illumination optical system. This black dot plate 61 is a transparent glass plate 6.
2 and a small black dot 63 provided at the center of the transparent glass plate 62. This small black dot 63 is shown in FIG. 8 (b).
As shown in FIG. 5, a circular recess 64 is formed in the center of the transparent glass plate 62 by etching, and black paint is applied to the inside of the circular recess 64 to form it in the center of the transparent glass plate 62.

[0006]

However, in such a fundus camera, a part of the luminous flux 65 of the illumination light is shown in FIG.
As shown in (b), an arrow 66 is formed at the edge of the recess 64.
However, there is a problem that the scattered light, that is, the scattered light, passes through the central hole of the perforated mirror and mixes into the photographing system through the photographing diaphragm to cause flare and ghosts.

In particular, as shown in FIG. 10, when there are black dot plates A and B provided with black dots a and b in the illumination optical path, the edge of the black dot a of the black dot plate A closer to the objective lens. A part of the scattered light flux C of the black dot plate B from the light source
There is a light beam D (scattered light beam) that satisfies the condition of passing through the black point b of.

That is, since the scattered light beam D has no black point b, the scattered light beam D is reflected by the objective lens and mixed into the photographing optical system to form flare or ghost. Since flare and ghost are reflected by the surface of the objective lens and directly pass through the aperture of the photographing diaphragm due to the scattered light flux D generated when there are a plurality of black spots, the flare and ghost are generated as compared with the case where there is one black spot. Tends to be stronger.

Further, a part of the illumination light flux reflected on the surface of the objective lens or the eye to be examined returns to the small black spot, is reflected on the surface of the small black spot, is reflected again on the surface of the objective lens, and then is photographed. There is also a problem that it mixes with the system and causes flares and ghosts. to solve this problem,
Conventionally, as shown in FIG. 9, a black paint with small black dots is made of a material having a refractive index substantially the same as that of the transparent glass plate 62, and it is also considered to provide an antireflection film 67 on the side where the small black dots 63 are provided. However, the reflected light as shown by the arrow 68 cannot be completely eliminated, and 0.5 to 0.1% is present, which is a problem.

As means for solving this problem, for example, Japanese Patent Laid-Open No. 177734/1982 and Japanese Utility Model Publication No. 3-3528.
A fundus camera having a black dot plate as disclosed in Japanese Patent No. 4 has been considered.

In this publication, a flat glass plate 70 (number 10 in the publication) as shown in FIG. 11 is disclosed as the above-mentioned black dot plate. Moreover, in the official gazette, the flat glass 70 (10 in the official gazette) is illustrated as if two glass plates were seemingly bonded together. However, “Because scattered light due to diffraction is generated at the edge of the light blocking member (black dot) 70a in the flat glass plate 70, the light blocking member 70a
The outer peripheral edge of the light emitted a ring-shaped light as a secondary light source "and" the scattered light of the ring-shaped ring may cause harmful reflected light at the objective lens ". Is disclosed in.

Considering this, in the above publication,
Only the "configuration in which the flat glass plate 70 is composed of two pieces of glass laminated on each other and the light blocking member 70a is provided between the glass plates" is merely disclosed, and the edge of the light blocking member 70a is not disclosed. I have not considered any measures to prevent light scattering.

Therefore, conventionally, in order to prevent the gold annular scattered light generated at the edge of the light shielding member 70a from causing harmful reflected light at the objective lens, the front and rear surfaces of the flat glass plate 70 are prevented. The auxiliary light-shielding members 70b and 70c are provided, and the light-shielding members 70b and 70c are used to shield the light-shielding member 70a.
The scattered light generated at the edge of is removed.

As a result, the conventional type in which the light shielding member is provided between the glass plates has a complicated structure.

Therefore, according to the present invention, a black dot plate for an ophthalmologic apparatus and an ophthalmologic apparatus using the same can prevent scattered light or reflection that causes flare or ghost from occurring at the edge portion of the black dot plate with a simple structure. It is intended to provide.

[0016]

In order to achieve this object, the invention of claim 1 is characterized in that a black paint layer is provided as a small black dot between a plurality of superposed light-transmitting substrates. The surroundings of the black paint layer are filled with an adhesive that has the same refractive index as the substrate and the black paint layer, or has substantially the same refractive index as the substrate and the black paint layer, and can transmit light. It is characterized in that it is a black dot plate for an ophthalmologic apparatus that is adhesively fixed.

The invention of claim 2 is characterized in that two substrates are provided, and a black paint layer formed between the two substrates is provided as the small black dots.

The invention of claim 3 is characterized in that three substrates are provided, and a black paint layer is provided between the substrates as small black dots.

The invention of claim 4 is characterized in that a recess is formed in one of the adjacent substrates and the black paint layer is formed in the recess.

The invention of claim 5 is characterized in that the black paint layer is formed on one of the facing surfaces of the adjacent substrates.

The invention of claim 6 is characterized in that a filter plate for cutting light of a specific wavelength is used for the substrate not provided with the small black dots.

The invention of claim 7 is provided in an illumination system for projecting illumination light from an illumination light source onto an eye to be examined through a perforated mirror to illuminate the eye to be examined, and an optical path for photographing the eye to be examined. And a photographing system having a photographing diaphragm, wherein the illumination system and the photographing system have an objective lens shared between the eye to be inspected and the perforated mirror, and the illumination system is provided with a small black dot. When the lens surface of the objective lens is considered as a reflective surface, the position where the image of the aperture of the photographing diaphragm is formed and the small black dot are provided conjugate with each other through the reflective surface. In the ophthalmologic apparatus in which the image of the opening portion of the photographing diaphragm is covered with the small black dots, the black dot plates are at least two light-transmissive substrates that are laminated and adhered to each other, The at least two substrates And a small black spot provided on the substrate and the black paint layer have the same refractive index or substantially the same refractive index as the substrate and the black paint layer, and can transmit light, and between the substrates and around the small black dot. And an adhesive agent for adhering and fixing the substrates to each other without any gaps.

According to an eighth aspect of the present invention, a plurality of small black dots are provided, and a black dot plate having a small black dot other than the small black dot closest to the illumination light source among the plurality of small black dots,
It is characterized in that it is composed of at least two substrates and small black dots provided between the substrates without a gap.

[0024]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will now be described with reference to FIGS.
It will be described with reference to FIG.

<Embodiment 1> FIGS. 1 to 3 show an embodiment of the present invention, and FIG. 1 shows an optical system of a fundus camera (ophthalmologic apparatus). In FIG. 1, 1 is an illumination optical system (illumination system) of the fundus camera, 2 is an observation / shooting optical system (shooting system) of the fundus camera, and E is an eye to be inspected.

[Illumination Optical System] The illumination optical system 1 has an observation illumination optical system and a photographing illumination optical system. Moreover, this illumination optical system 1 has a halogen lamp 3 (observation illumination light source), a condenser lens 4, a xenon lamp 5 (imaging illumination light source), a condenser lens 6, and a ring-shaped light transmitting portion 7 in FIG. Ring diaphragm 8, reflection mirror 9, lens 1
0, a black spot plate 11, a lens 12, a perforated mirror 13, an objective lens 14 and the like are provided in this order. The optical components from the halogen lamp 3 to the objective lens 14 constitute an observation illumination optical system, and the optical components from the xenon lamp 5 to the objective lens 14 constitute a photographing illumination optical system. In the figure, 13a is a central hole of the perforated mirror 13.

Then, the photographing illumination light from the xenon lamp 5 is projected onto the fundus Ef of the eye E through the optical components from the condenser lens 6 of the photographing optical system to the objective lens 14. Moreover, an exciter filter EF for visible fluorescence is provided between the condenser lens 6 and the ring diaphragm 8.
Are provided so as to be able to be inserted and removed.

The observation illumination light from the halogen lamp 3 is projected on the fundus oculi Ef through the optical components from the condenser lens 4 to the objective lens 14.

[Observation / shooting optical system] Observation / shooting optical system 2
Has an electronic observation / shooting optical system and a film shooting optical system.

The electronic observation / photographing optical system includes an objective lens 14 facing the eye E, a photographing diaphragm 15, a focusing lens 16, an imaging lens 17, a quick return mirror 18, and a mask 1.
9. It has a field lens 20, a reflection mirror 21, a relay lens 22 and the like which are conjugated with the fundus oculi Ef. Moreover, a barrier filter BF for fluorescence photography is disposed between the photography diaphragm 15 and the focusing lens 16 so as to be insertable and removable.

Then, the fundus image by the reflected light from the fundus Ef of the eye E to be inspected, the optical components from the objective lens 14 to the imaging lens 17, the mask 19 and the field lens 2 are shown.
An image is formed on the area CCD 23a (image input means, image pickup means) of the television camera 23 via 0, the reflection mirror 21, and the relay lens 22. The video signal output from the television camera 23 is input to the monitor television 25 via the control circuit 24, and the fundus image is displayed on the monitor television 25.

The film photographing optical system includes an objective lens 14 facing the eye E to be examined, a focusing lens 16, and an imaging lens 1.
7. Has a mask M, quick return mirror 1
The light from the eye to be inspected is guided to the film F of the 35 mm camera in the state where 8 is removed from the optical path of the photographing system as shown by the broken line. The photographing system has the objective lens 14 shared with the illumination system as described above.

[Black Point Plate 11] Here, the surface (lens surface) 14a and the surface 14 of the objective lens 14 on the side of the perforated mirror 13 are provided.
The surface (lens surface) on the side opposite to a is 14b, the photographing diaphragm 15 is the object point, and the two surfaces 14a, 1
The positional relationship between the objective lens 14 and the black spot plate 11 will be described with a position 14c (a position between the surfaces 14a and 14b) conjugate with the photographing diaphragm when 4b is a reflecting surface.

The black dot plate 11 has two transparent glass plates (light-transmissive substrates) 30 and 31 which are superposed on each other as shown in FIGS. A recess 32 formed by photo-etching is provided in the center of the transparent glass plate 30 as shown in FIG. 3 (b), and a small black spot 33 (black paint layer) formed by applying black paint in the recess 32. Is provided.

The transparent glass plate 31 is adhered to the surface of the transparent glass plate 30 on the concave portion 32 side with an adhesive 34 (adhesive layer),
The corners of the recesses 32 provided in the transparent glass plate 30 and the gap formed between the black paint layer 33 and the transparent glass plate 31 are filled with the adhesive 34 without any gap. This adhesive 34
Uses a transparent glass plate having the same or substantially the same refractive index as the transparent glass plates 30 and 31 and the black paint layer 33 (black paint).

The small black dots 33 on the black dot plate 11 are the photographing apertures 15.
14a of the objective lens 14 with the opening 15a of
It is provided in a conjugate with the position 14c of the image formed by. As a result, the image of the small black spot 33 is formed at the position 14c conjugate with the objective lens 14. Further, the small black dots of the black dot plate 11a are provided so as to be conjugate with the position 14c with respect to the surface 14b.

As a result, the opening 15a of the photographing diaphragm 15 is formed.
The image forming position and the small black spot 33 are provided in a conjugate manner via the surfaces 14a and 14b as reflecting surfaces, and the image of the opening 15a of the photographing diaphragm 15 is covered by the small black spot 33. . Therefore, the black spot plate 11 can remove flares and ghosts generated by the surfaces 14 a and 14 b of the objective lens 14.

<Embodiment 2> In the embodiment described above, the recess 32 is provided in the transparent glass plate 30 and the small black spot 33 is formed in the recess 32. However, the present invention is not limited to this. It is not something that will be done. For example, as shown in FIG. 4, a small black dot 33 'made of a black paint layer is provided by photo-etching in the center of the transparent glass plate 30, and the small black dot 33' is positioned between the transparent glass plates 30 and 31. , Transparent glass plates 30, 31 with transparent adhesive 34
It may be configured to be bonded to each other via.

Example 3 Depending on the shape of the objective lens 14, for example, as shown in FIG. 5 (disclosed in Japanese Patent Publication No. 61-97), the objective lens 14 is composed of a plurality of lenses. , Multiple black dots are required.

That is, in this embodiment, in the structure of the first embodiment, the objective lens 14 is composed of the positive lens 40 and the meniscus lens 41, and the lens 10 and the black dot plate 11 are provided.
The black dot plate 42 is disposed between the black and white points. The black dot plate 42 has a recess 4 in the center as shown in FIG. 6 (a).
Transparent glass plate 43 (substrate) having 3a, and the concave portion 4
It is composed of small black dots 44 (black paint layer) provided on 3a.

The black spot plate 42 is provided so as to be conjugate with the position 40c between the surfaces 40a and 40b of the positive lens 40, and the aperture 15a of the photographing diaphragm 15 is provided so as to be conjugated with the position 40c. The black dot plate 11 is provided so as to be conjugate with the surface 41 a of the meniscus lens 41.

According to the present embodiment, scattered light as shown by 45 in FIG. 6A does not occur at the edge portion of the small black spot 33 of the black spot plate 11 on the objective lens 14 side. It is possible to prevent strong flare and ghost from occurring due to the scattered light.

The black dot plate 42 in this embodiment is shown in FIG.
In place of the black dot plate 42 as shown in (b), two black dot plates 11 and 46 are used.
It may be configured to be provided with one. In addition, 47 and 48 are transparent glass plates (substrates), 49 is a concave portion provided in the center of the transparent glass plate 47, and 50 is a small black dot formed of a black paint layer provided in the concave portion 49.

<Embodiment 4> Further, the black dot plates 11 and 42 in FIGS. 5 and 6 (a) are used as one black dot plate 50 as shown in FIG. 7 when the small black dots 33 and 44 are close to each other. It can also be formed. That is, the black dot plate 50 has transparent glass plates 51, 52, 53 (substrates through which light can pass) laminated in order. Then, recesses 51a and 53a are formed in the centers of the surfaces of the transparent glass plates 51 and 53 that face each other, and small black spots 51b and 53b (black paint layers formed by applying black paint to the recesses 51a and 53a). )
Is provided. Moreover, this transparent glass plate 51, 5
2, 53 are bonded and fixed to each other with an adhesive (not shown) as in the above embodiment.

<Other Embodiments> In the above embodiment, the transparent glass plates 30 and 31 are used as the substrates of the black dot plate 11 and the transparent glass plates 51, 52 and 53 are used as the substrates of the black dot plate 50. Although shown, the substrate of the black dot plates 11 and 50 is not necessarily limited to the transparent glass plate. That is, the transparent glass plates 30 and 31 which are the substrates of the black dot plate 11 or the transparent glass plates 51, 52 and 53 of the black dot plate 50 are colored glass filters such as sharp cut filters and color temperature conversion filters and plastics depending on the application. It may be replaced with the substrate.

Color glass filters such as sharp cut filters and color temperature conversion filters are expensive. Therefore, a color glass filter such as a sharp cut filter or a color temperature conversion filter is used as the black dot plate 11,
When it is provided on 50 or the like, small black dots 33 or 51b, 53
As the substrate on which b is provided, transparent glass plates 30, 51,
53 is used as it is, or a transparent plastic plate is used, and only the substrate without the small black spots 33 or 51b, 53b, that is, the transparent glass plates 31, 52 is colored glass such as a sharp cut filter or a color temperature conversion filter. You may replace with a filter. Thus, when processing the small black dots 33, 51b, 53b and the like, even if a processing defect occurs on the substrate, an expensive filter or the like is not wasted due to the small black dot processing defect.

[0047]

As described above, according to the first aspect of the present invention, the black paint layer is provided as a small black dot between a plurality of light-transmitting substrates which are superimposed on each other, and the substrate and the black paint are provided. The same refractive index as the layer or the same refractive index as the substrate and the black paint layer, and the periphery of the black paint layer is filled with an adhesive capable of transmitting light, and the substrates are bonded and fixed to each other. Since there is no difference in the refractive index between the substrate and the adhesive between them, the area around the small black dots will be filled with this adhesive, and scattered light that causes flares and ghosts will occur. Can be reliably prevented from occurring at the edge portion of each small black dot.

According to the second aspect of the present invention, the two substrates are provided, and the black paint layer formed between the two substrates is provided as the small black dots. Therefore, the cause of flare and ghost is generated. It is possible to easily manufacture a black dot plate in which scattered light that does not occur at the edge portion of the small black dot.

According to the third aspect of the present invention, the three substrates are provided and the black paint layer is provided as each small black dot between the respective substrates. Therefore, even if a plurality of small black dots are provided, flare and Scattered light that causes a ghost does not occur at the edge of each small black dot.

According to the invention of claim 4, a concave portion is formed in one of the adjacent substrates, and the black paint layer is formed in the concave portion. Therefore, scattered light which causes flare and ghost is generated. The black spot plate that does not occur at the edge of each small black spot can be thinned.

According to the fifth aspect of the invention, since the black paint layer is formed on one of the facing surfaces of the adjacent substrates, the black dot plate can be easily processed.

According to the invention of claim 6, a filter plate for cutting light of a specific wavelength is used for the substrate on which the small black dots are not provided. Therefore, by using the black dot plate of the present invention, ophthalmology is possible. Color glass filters such as sharp cut filters and color temperature conversion filters or other filters provided in the illumination optical path of the apparatus can be omitted, which is advantageous in terms of the number of parts. Moreover, since a filter plate that cuts light of a specific wavelength is used on a substrate that does not have a small black dot, even if the process of providing a black dot plate on one substrate fails, this failure will damage the expensive filter. This is also advantageous in terms of processing and yield.

According to a seventh aspect of the present invention, in the ophthalmologic apparatus, the illumination light from the illumination light source is projected onto the eye to be inspected through the perforated mirror to illuminate the eye to be inspected, and an optical path for photographing the eye to be inspected. A photographic system having a photographic aperture provided in the illuminating system, the illuminating system and the photographic system have an objective lens shared between the eye to be inspected and the perforated mirror, and the illuminating system is small. With a black dot plate with black dots,
When the lens surface of the objective lens is considered to be a reflecting surface, the position where the image of the opening portion of the photographing diaphragm is formed and the small black spot are provided conjugate with each other through the reflecting surface, and the opening portion of the photographing diaphragm is formed. In the ophthalmologic apparatus in which the image is covered with the small black dots, the black dot plate is provided between at least two light-transmissive substrates that are laminated and bonded to each other, and between the at least two substrates. The provided small black dots have the same refractive index as the substrate and the black paint layer or have substantially the same refractive index as the substrate and the black paint layer and can transmit light, and between the substrates and around the small black dots. Since it is composed of an adhesive that fills without gaps and bonds each substrate to each other, it prevents scattered light and reflection that cause flares and ghosts from occurring at the black dot plate,
It is possible to prevent flare and ghost from occurring due to surface reflection at the objective lens.

According to an eighth aspect of the present invention, a plurality of small black dots are provided, and a black dot plate having a small black dot other than the small black dot closest to the illumination light source among the plurality of small black dots is
Since the configuration is made up of at least two substrates and small black spots provided without a gap between the substrates, the generation of scattered light at the small black spots that easily causes strong scattered light that causes flare and ghosts. Can be reliably prevented.

[Brief description of drawings]

FIG. 1 is an explanatory diagram showing an optical system showing an example of an ophthalmologic apparatus according to the present invention.

FIG. 2 is an enlarged view of a main part of FIG.

3 (a) is a cross-sectional view of the black dot plate shown in FIG. 1, and (b) is (a).
3 is an enlarged sectional view of a main part of FIG.

4 (a) is a cross-sectional view showing another example of the black spot plate shown in FIG. 1, and FIG. 4 (b) is an enlarged cross-sectional view of a main part of FIG. 3 (a).

FIG. 5 is a principal part explanatory view showing another example of the ophthalmologic apparatus of the present invention.

6 (a) is an explanatory view of the black dot plate shown in FIG. 5, and FIG. 6 (b) is FIG.
It is explanatory drawing which shows the modification of (a).

FIG. 7 is an explanatory diagram showing another example of the black dot plate according to the present invention.

8A is a sectional view showing an example of a black dot plate used in a conventional ophthalmologic apparatus, and FIG. 8B is an enlarged sectional view of a main part of FIG. 8A.

9A is a sectional view showing another example of a black dot plate used in a conventional ophthalmologic apparatus, and FIG. 9B is an enlarged sectional view of a main part of FIG. 9A.

FIG. 10 is an explanatory diagram showing another example of a conventional black dot plate arrangement.

FIG. 11 is an explanatory diagram showing still another example of a conventional arrangement of black dot plates.

[Explanation of symbols]

 E ... Eye to be inspected 1 ... Illumination optical system (illumination system) 2 ... Observation / shooting optical system (shooting system) 3 ... Halogen lamp (illumination light source) 5 ... Xenon lamp (illumination light source) 11 ... Black spot plate 13 ... Perforated mirror 15 ... Photography stop 14 ... Objective lenses 14a, 14b ... Surface (reflection surface) 14c ... Conjugate position 15a ... Opening 30, 31 ... Transparent glass plate (substrate) 32 ... Recess 33 ... Small black dot 34 ... Adhesive 50 ... Black dot plate 51, 52, 53 ... Transparent glass plates (substrates) 51a, 53a ... Recesses 51b, 53b ... Small black dots

Claims (8)

[Claims] 1. A black paint layer is provided as a small black dot between a plurality of substrates which can transmit light superimposed on each other,
The surroundings of the black paint layer are filled with an adhesive that has the same refractive index as the substrate and the black paint layer, or has substantially the same refractive index as the substrate and the black paint layer, and can transmit light. A black dot plate for an ophthalmologic apparatus, which is characterized by being adhesively fixed. 2. The black dot plate for an ophthalmologic apparatus according to claim 1, wherein two substrates are provided, and a black paint layer formed between the two substrates is provided as the small black dots. . 3. The black dot plate for an ophthalmologic apparatus according to claim 1, wherein three substrates are provided, and a black paint layer is provided between the substrates as small black dots. 4. The black dot board for an ophthalmologic apparatus according to claim 1, wherein a recess is formed in one of the adjacent substrates, and the black paint layer is formed in the recess. 5. The black dot plate for an ophthalmologic apparatus according to claim 1, wherein the black paint layer is formed on one of opposing surfaces of the adjacent substrates. 6. The black dot plate for an ophthalmologic apparatus according to claim 4, wherein a filter plate that cuts light of a specific wavelength is used on the substrate on which the small black dot is not provided. 7. An imaging system having an illumination system for projecting illumination light from an illumination light source onto an eye to be inspected through a perforated mirror and illuminating the eye to be inspected, and an imaging diaphragm provided in an optical path for imaging the eye to be inspected. A system, the illumination system and the imaging system have a shared objective lens disposed between the eye to be inspected and the perforated mirror,
The illumination system has a black dot plate provided with small black dots, and when the lens surface of the objective lens is considered to be a reflecting surface, the position where an image of the aperture of the photographing diaphragm is formed and the small black dots are reflected. In an ophthalmologic apparatus provided so as to be conjugated via a surface so that the image of the opening portion of the photographing diaphragm is covered by the small black dots, the black dot plates are at least two sheets that are adhered by being overlapped with each other. A substrate through which light can pass, and the at least 2
Small black spots provided between the substrates, and the same refractive index as the substrate and the black paint layer or substantially the same refractive index as the substrate and the black paint layer and capable of transmitting light, and between the substrates and An ophthalmologic apparatus comprising an adhesive agent that fills the periphery of a small black spot without any gaps and adheres and fixes each substrate to each other. 8. A plurality of small black dots are provided, and a black dot plate having a small black dot other than the closest small black dot to the illumination light source among the plurality of small black dots is at least two substrates and the black dot plate. The ophthalmologic apparatus according to claim 7, wherein the ophthalmologic apparatus is composed of small black dots provided without gaps between the substrates.