JP2000083902A - Eyeball photographing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an eyeball photographing device executing high-level diagnosis by obtaining information on the recess, projection, etc., of the photographing objective site of an eye to be examined. SOLUTION: An illuminating optical system 4 with a slit 9 for illuminating the anterior ocular segment of the eye to be examined E from its obliquely front side with slit light is provided with a diaphragm 22 being an optical flux switching means for substantially switching the direction of an optical flux passing through the slit 9. In this case, the diaphragm 22 consists of a light transmission limiting board disposed on the optical axis of the system 4, one side of the optical axis of the diaphragm 22 or a line passing through the neighborhood of the optical axis becomes a light transmitting part T, the other side becomes a light non-transmitting part U and the diaphragm 22 is rotated with this light axis as a center axis to switch the light transmitting part T and the light non-transmitting part U.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an eyeball photographing apparatus, and more particularly to an eyeball photographing apparatus for observing and photographing an anterior eye part (for example, endothelial cells of the cornea) by a specular method.

[0002]

2. Description of the Related Art Conventionally, as an example of an eyeball photographing apparatus, there is a contact type or non-contact type specular observation / photographing apparatus for enlarging and observing each part of an endothelial cell of an eyeball. This device irradiates slit illumination light obliquely with respect to the optical axis of the eye to be examined, receives specularly reflected light from the cornea thereof obliquely, and observes and photographs this image.

When observing and photographing corneal endothelial cells,
The inclination of the slit illumination optical axis with respect to the optical axis of the eye to be inspected is made as small as possible in order to make the imaging section planar and as wide as possible. However, if it is too small, the reflected light from the corneal epithelium 51 and the reflected light from the endothelium 52 shown in FIG. 7 cannot be separated, and the epithelial image 53 and the endothelial image 54 overlap.・ Cannot shoot. On the other hand, if the width of the slit 55 is reduced so as not to overlap, an image with a wide visual field cannot be obtained.

[0004] Conventionally, contradictory structures for both purposes of clearly separating epithelial reflected light and endothelial reflected light and obtaining a wide-field planar image, that is, the width of the slit and the inclination of the illumination / imaging optical axis. The corners are compromised. Then, an endothelial cell image 56 as shown as an example in FIG. 8 is observed and photographed.

[0005]

As described above, such a conventional apparatus is for observing and photographing endothelial cells two-dimensionally. Therefore, the planar shape of each cell can be clearly observed and photographed as its outline, and it is easy to determine the size of each cell in plan view. However, it is difficult to distinguish irregularities of the endothelium, three-dimensional swelling / contraction of cells, and the like, and it is also difficult to distinguish temporal changes in the shape of the same eye.

[0008] As shown by reference numeral 57 in FIG. 8, a region where a light and dark distribution is formed may be recognized on the endothelium in some cases. Such light and dark may be inferred to reflect the properties of each eye to be examined, such as the unevenness of the endothelial cells and the difference in the refractive index of the cells. However, it is difficult to obtain detailed information only by observing and photographing two-dimensionally.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problem, and an eyeball photographing apparatus capable of performing a more advanced diagnosis by obtaining information such as irregularities of a region to be photographed such as endothelial cells of an eye to be examined. It is intended to provide.

[0008]

According to the present invention, there is provided an eyeball photographing apparatus comprising: an illumination optical system having a slit for illuminating an anterior eye part of an eye to be inspected obliquely from the front with slit light;
A photographing optical system for photographing the slit light reflected by the anterior segment of the subject's eye, and a direction of a light beam passing through the slit, which is disposed on the optical axis of the illumination optical system, for substantially switching Light beam direction switching means.

With this configuration, the direction of the slit light that illuminates the anterior segment from obliquely forward is substantially switched so that the same portion to be photographed (hereinafter, the same portion of corneal endothelial cells will be described as an example). Images can be observed and photographed before and after the switching. Then, if the endothelial cells have irregularities, since the shadow of the image of the same site is different before and after the above-mentioned switching, it is possible to determine whether the shadow is caused by the irregularities or the refractive index difference by comparing the two images. Is obtained. “Substantially switching the direction of the slit light” described above and below means that the slit light is inclined in a direction parallel to the longitudinal direction of the slit or the inclination angle is changed.

Another eyeball photographing apparatus according to the present invention comprises an illumination optical system for illuminating an anterior eye of an eye to be examined from obliquely forward with slit light, and an illumination optical system for illuminating the slit light reflected by the anterior eye of the eye to be inspected. A photographing optical system having photographing means for photographing, and a direction of slit light, which is disposed on the optical axis of the photographing optical system and is reflected by the surface of the anterior segment and reaches the photographing means, is substantially switched; And a light beam direction switching means.

With this configuration, by substantially switching the direction of the slit light reflected by the anterior segment,
The image of the corneal endothelial cells can be observed and photographed before and after the switching. Therefore, if the endothelial cells have irregularities, the shadow of the image at the same site before and after the above-mentioned switching is different. Therefore, by comparing the two images, it is possible to obtain information that can determine whether the shadow is due to the irregularities or the refractive index difference. Can be

In the above eyeball photographing apparatus, the light beam direction switching means comprises a light transmission limiting plate disposed on the optical axis, and the light transmission limiting plate passes through the optical axis or the vicinity of the optical axis. One side of the line may be configured to be light-transmissive and the other side may be configured to be light-impermeable, and the line may be configured to be switchable between the light-permeable part and the light-impermeable part.

More specifically, by configuring the light transmission limiting plate so as to be rotatable about its optical axis and set at an arbitrary rotational position, the total illumination light flux ( Alternatively, any part of the total reflected light beam can be transmitted. In other words, the slit light can be inclined in a direction parallel to the longitudinal direction of the slit or the inclination angle can be changed, which is convenient. In other words, the inclination angle of the optical path can be arbitrarily selected within a predetermined range.

According to still another aspect of the present invention, there is provided an eyeball photographing apparatus comprising: a first illumination optical system and a second illumination optical system for illuminating an anterior eye part of an eye to be examined from obliquely forward with slit light; A photographing optical system for photographing the slit light reflected on the surface of the unit, the two illumination optical systems each having an illumination light source, a relay lens, and a slit, and further having a common objective lens. The two slits are configured so that the conjugate points of the objective lenses of the two slits coincide with each other, and the lighting of the two illumination light sources is switched.

By doing so, the same portion of the subject's eye can be illuminated by the first and second different illumination optical systems. That is, it is possible to irradiate the same part of the subject's eye with slit illumination light along different optical paths. By switching on and off the light sources of the two illumination optical systems for observation and photographing, it is possible to observe and photograph an image of the same part of the corneal endothelial cell before and after switching the illumination light path.
Then, since the illumination of the first illumination optical system and the illumination of the second illumination optical system have different shadows of the unevenness of the endothelial cells, comparing the two images indicates whether the shadow is due to the unevenness or the refractive index difference. The information which can judge etc. is obtained.

[0016]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An eyeball photographing apparatus according to the present invention will be described based on an embodiment shown in the accompanying drawings.

FIG. 1 is a plan view showing a schematic arrangement of a cornea photographing apparatus which is an embodiment of the eyeball photographing apparatus of the present invention. FIG. 2 is a perspective view of the corneal imaging apparatus of FIG. FIG. 3 is a view showing an example of a corneal endothelial cell photographed image obtained by the corneal photographing apparatus of FIG. FIG. 4 is a plan view showing a schematic arrangement of a corneal imaging apparatus as another embodiment of the eyeball imaging apparatus of the present invention. FIG. 5 is a perspective view of a main part showing a corneal photographing apparatus as still another embodiment of the eyeball photographing apparatus of the present invention. FIG.
FIG. 9 is a perspective view of a main part showing a corneal imaging apparatus as still another embodiment of the eyeball imaging apparatus of the present invention.

The corneal photographing apparatus 1 shown in FIG. 1 is mounted on a machine frame 2 which can be moved in a Z direction which moves forward and backward toward an eye E to be examined and in an X direction and a Y direction which are perpendicular to the Z direction and perpendicular to each other. The photographing system 3 is provided.

The photographing system 3 illuminates the anterior eye portion of the eye E to be examined from obliquely forward with slit light, and photographs the slit light reflected by the anterior eye portion of the eye E. And a focusing optical system 6 for making the focal point of the imaging optical system 5 coincide with the corneal endothelium, which is a portion to be imaged, and alignment of the imaging optical axis toward the anterior segment of the eye E ( And an alignment optical system (not shown) for irradiating alignment light for alignment) from the front and performing alignment based on the corneal reflection image.

As shown in FIGS. 1 and 2, the illumination optical system 4 has a strobe discharge tube 7 as a light source for illuminating the anterior ocular segment, passes visible light therefrom through a relay lens 8 and a slit 9, The slit light is converged on the cornea of the eye E by the projection lens 10. In the present embodiment, the half mirror 11 is interposed in the optical axis of the illumination optical system 4 in order to make the optical axis of a focusing optical system described later halfway from the optical axis of the illumination optical system 4. The half mirror 11 transmits the illumination light, which is visible light, and reflects the focus detection light, which will be described later, which is infrared light.

The photographing optical system 5 has a television camera 12 for photographing a corneal tissue. The slit light reflected by the cornea of the eye E is subjected to an objective lens 13 and a half mirror 1.
4, through the slit 15, the imaging lens 16 and the mirror 17, and then to the television camera 12.
In the present embodiment, since the optical axis of the photographing optical system 5 is almost the same as that of a focusing optical system described later,
The optical axis is branched on the way by interposing. The half mirror 14 reflects illumination light, which is visible light, and transmits focus detection light, which is infrared light, which will be described later.

The focusing optical system 6 has an illumination lamp 18 as a focusing light source and a focusing detection light receiving element 19.
The half mirror 11 converts the infrared light transmitted from the illumination lamp 18 through the condenser lens 20 into slit light along the optical axis of the illumination optical system 4 and irradiates the eye E with the slit light. Then, the reflected light on the surface of the anterior segment is transmitted to the photographing optical system 5.
Along the optical axis to the focus detection light-receiving element 19. At this time, the reflected light on the surface of the anterior eye is changed to
Along the optical axis, reaches the half mirror 14, passes through the half mirror 14, passes through the slit 21, and receives the focus detection light receiving element 1
9 is received.

The illumination optical system 4 and the focusing optical system 6 reflect each other such that the slit light for focus detection is reflected so as to be exactly incident on the light receiving point of the light receiving element 19 for focus detection. The focal point is hereinafter referred to as the focal point of the slit light in the illumination optical system 4. Then, the machine frame 2 is moved in the Z direction, and the movement of the machine frame 2 in the Z direction is stopped by a signal from the fact that the slit light is received by the focus detection light-receiving element 19 (focusing has been performed). This focusing operation may be performed in parallel with the alignment operation, or may be performed after the alignment is completed.

The alignment is performed by a known method. That is, the near-infrared light, which is the alignment light, is collimated and the eye E
Is irradiated from the front to the anterior eye portion of the TV camera 12 to form a reflected bright spot image (Purkinje image) on the light receiving element 12a of the television camera 12. Then, a light spot corresponding to the Purkinje image is displayed on the screen of the monitor display, and the machine frame 2 is moved in the X and Y directions so that the light spot coincides with the center of the screen indicating the optical axis of the photographing optical system 5. To be aligned.

An excellent feature of the present corneal photographing apparatus 1 is that, as shown in FIGS. 1 and 2, a stop 22 as a light beam direction switching means is interposed between the strobe discharge tube 7 and the relay lens 8 in the illumination optical system 5. That is the point.

The stop 22 is connected to the illumination optical system 5 as shown in FIG.
Is a so-called light transmission limiting plate that can be rotationally driven with the optical axis of the central axis L as the central axis L. The light transmitting portion T having a larger area and the light transmitting section T having a smaller area are formed by a straight line passing through a point slightly deviated from the central axis L. It is divided into a light opaque part U. on the other hand,
As shown in FIG. 2, a strobe discharge tube 7 and each slit 9, 1
5, 20, and 21 are arranged vertically. That is, the strobe discharge tube 7 and each of the slits 9, 15, 20, 21
Are arranged so that the longitudinal direction of the lens is perpendicular to a plane including the optical axis of the illumination optical system 4 and the optical axis of the imaging optical system 5. Therefore, in the state shown in FIG. 2, the stop 22 acts to block almost the lower half of the light beam of the strobe discharge tube 7. In this manner, the light emitted to the eye E is emitted from the stop 2
As compared with the case where the second lens unit 2 is not provided, the light amount of the light flux reaching the subject's eye E from slightly above the illumination optical axis is increased. In other words, the subject's eye E is illuminated substantially inclining from slightly above the illumination optical axis. If the stop 22 is rotated by 180 ° to block almost the upper half of the luminous flux of the strobe discharge tube 7, the eye E is illuminated with a slight inclination from substantially below the illumination optical axis. A well-known device such as a servomotor may be used as a rotation driving unit of the diaphragm 22.

The aperture is not limited to the rotary type. For example, by reciprocating up and down an aperture made entirely light-opaque, a strobe discharge tube 7 is provided.
The upper half and the lower half of the luminous flux may be blocked.

The aperture 22 has a large area for the light transmitting part T and a small area for the light non-transmitting part U, but may have the opposite or the same area. That is,
The imaginary straight line separating the two portions T and U may pass through the optical axis or may pass through a position slightly deviated from the optical axis. If the light transmitting portion T has a large area, the substantial inclination angle of the light beam is small but the light amount is large. If the light transmitting portion T is small, the light amount is small but the substantial inclination angle of the light beam is large. Therefore, the area ratio may be changed as needed.

The strobe discharge tube 7 has a light source control means 2
3 is connected, and can emit light in synchronization with the rotation of the diaphragm 22. Thereby, while illuminating the subject's eye E with a slight inclination from above and photographing the endothelial cells, the diaphragm 22 is rotated 180 ° to illuminate the endothelial cells at the same site by illuminating slightly from below with a short time difference. it can. By performing the above-described imaging while continuing the alignment operation and the focusing operation, the imaging region does not go out of order. As described above, when the same portion of the corneal endothelium is photographed by illumination light from substantially different directions, if the photographing range has irregularities, the shading due to the irregularity is inevitably different.

FIG. 3 shows an example. FIG. 3A shows an image of an endothelial cell photographed by being slightly illuminated from slightly above the illumination optical axis, and FIG. 3B shows an image by substantially illuminating from slightly below the illumination optical axis. 3A shows an image of the endothelial cells at the same site as FIG. 3A, and FIG. 3C shows an image of the endothelial cells at the same site as FIG.

When comparing FIG. 3 (a) and FIG. 3 (b),
In the area A, the distribution of dark areas is almost the same in both images, but FIG.
FIG. 3A shows a dark area B, and FIG. 3B does not show the dark area B, but a dark area C is found in a portion below the dark area B. From this comparison, it is inferred that the dark area A is caused by the difference in the refractive index, and that the area D surrounded (sandwiched) by the dark area B and the dark area C has a concave portion. This point becomes clearer by studying also FIG. That is, in FIG. 3C, the dark area A is recognized, but the other dark areas B and C are not clearly recognized.

Although the stop 22 is interposed between the strobe discharge tube 7 and the relay lens 8, it is not limited to such a position, but may be any position where almost half of the slit beam can be blocked. For example, it may be disposed at an appropriate position on the optical axis of the illumination optical system 4. For example, instead of the above-mentioned position, as shown by a two-dot chain line in FIG. Even in this position, the same operation and effect as described above can be obtained.

In the corneal endothelium photographing apparatus 25 shown in FIG. 4, the stop 22 is provided not in the illumination optical system 4 but in the photographing optical system 5. Other configurations are the same as those of the above-described corneal endothelium imaging apparatus 1 (FIGS. 1 and 2), and therefore, the same reference numerals are given to corresponding members, and description thereof is omitted.

The stop 22 is an objective lens 13 of the photographing optical system 5.
Is arranged at a position on the side of the subject's eye E adjacent to the subject E. The rotation operation blocks almost the lower half and the upper half of the slit light reflected by the anterior segment of the subject's eye E. For example, when the lower half of the reflected slit light is blocked, the same effect as when the stop 22 blocks the upper half of the slit illumination light in the corneal endothelium imaging apparatus 1 (FIGS. 1 and 2) is achieved. When the upper half of the reflected slit light is blocked, the same effect as when the lower half of the slit illumination light is blocked is apparent. Therefore,
By photographing the corneal endothelial cells before and after the 180 ° switch of the diaphragm 22, and comparing these images, valuable information on the properties of the corneal endothelial cells can be obtained.

In the corneal endothelium photographing apparatus 25, the diaphragm 2
The arrangement position of 2 is not limited to the above. Any position on the optical axis of the photographing optical system 5 may be provided at a position where almost half of the reflected slit light beam can be blocked. For example,
Instead of the above-mentioned position, as shown by a two-dot chain line in FIG. Even in this position, the same operation and effect as described above can be obtained.

The corneal endothelium photographing apparatus 25 can also analyze the shadow of the endothelial cells described with reference to FIG.

FIG. 5 shows a corneal endothelium photographing apparatus 26 without the stop 22. By providing two illumination optical systems 27 and 28 in place of the stop 22, the same operational effects as those of the above-described corneal endothelium imaging devices 1 and 25 can be obtained. The photographing optical system of the present apparatus 26 is the same as that of the above-mentioned corneal endothelium photographing apparatus 1 (FIGS. 1 and 2), so that the illustration is omitted and the explanation is omitted in this figure.

As shown in the figure, the corneal endothelium photographing apparatus 26 is provided with a first illumination optical system 27 and a second illumination optical system 28, whereby the same operational effects can be obtained without the need for the above-mentioned stop 22. It is like that. Therefore, neither of the illumination optical systems 27 and 28 has a stop.

The first illumination optical system 27 is the same as the illumination optical system 4 of the above-mentioned corneal endothelium photographing apparatus 1 except that it does not have a stop, and therefore the same reference numerals are added and the description is omitted.

The second illumination optical system 28 also has its own strobe discharge tube 29, relay lens 30, and slit 31. Then, the half mirror 32 is disposed on the optical axis of the first illumination optical system 27 so that the second illumination optical system 2
The optical axis 8 is slightly inclined with respect to the optical axis of the first illumination optical system 27 so as to reach the eye E to be inspected. The illumination optical systems 27 and 28 can illuminate the same part to be imaged because their optical axes are aligned at the focal point of the device 26. As shown, both slits 9, 31 are oriented in the same direction. That is, both slit plates 9a,
Although 31a is at an angle to each other, it means that the slits (elongated openings) themselves are in the same plane.

A light source control means 33 is connected to the two strobe discharge tubes 7 and 29 so that they are turned on with a short time difference from each other. Therefore, the photographing with the illumination of the first illumination optical system 27 and the imaging with the illumination of the second illumination optical system 28 are performed after a very short time.

As described above, since the optical axes of the two illumination optical systems 27 and 28 are inclined with respect to each other, the illumination of the region to be imaged is stopped by the corneal endothelium imaging apparatus 1 (FIGS. 1 and 2). An effect equivalent to the case where the image is photographed by switching 22 is obtained. In other words, the subject E is illuminated by the first illumination optical system 27 while being slightly inclined from above, and conversely, the subject E is obliquely slightly inclined by the second illumination optical system 28 from below. Will be illuminated.

The corneal endothelium photographing apparatus 33 shown in FIG. 6 also includes a first illumination optical system 34 and a second illumination optical system 35.
Each of the illumination optical systems 34 and 35 has the stop 22. Since the photographing optical system of the present apparatus 33 is the same as that of the above-mentioned corneal endothelium photographing apparatus 1 (FIGS. 1 and 2), the illustration is omitted and the explanation is omitted in this figure. Also, the first illumination optical system 3
4 is the same as the illumination optical system 4 of the corneal endothelium photographing apparatus 1 described above, and therefore, the same reference numerals are added and the description is omitted.

The second illumination optical system 35 also has its own strobe discharge tube 36, relay lens 37 and slit 38, and the stop 22 is interposed between the strobe discharge tube 36 and the relay lens 37. The half mirror 39 is disposed on the optical axis of the first illumination optical system 34 so that the optical axis of the second illumination optical system 35 is
Are arranged so as to coincide with the optical axis of the eye E. The optical axes of the two illumination optical systems 34 and 35 are aligned at the focal point of the device 35. Both slits 9, 38
Are oriented in the same manner as in the corneal endothelium photographing apparatus 26 described above.

The stop 22 of the first illumination optical system 34 is fixed so as to block almost the lower half of the light beam of the strobe discharge tube 7, and cannot be switched. On the other hand, the second illumination optical system 35
The stop 22 is fixed so as to block almost the rear half (right half in the figure) of the light beam of the strobe discharge tube 36 and cannot be switched. Accordingly, when the light of the strobe discharge tube 36 that has passed through the stop 22 is reflected by the half mirror 39 and travels on the optical axis of the first illumination optical system 34, the light of the strobe discharge tube 7 in the first illumination optical system 34 It is almost equivalent to a light beam whose upper half is blocked.

Also in the present apparatus 33, the two strobe discharge tubes 7, 36 are turned on by a short time difference from each other by the light source control means 33 connected thereto. Therefore, the photographing with the illumination of the first illumination optical system 27 and the imaging with the illumination of the second illumination optical system 28 are performed after a very short time.

As described above, since the optical axes of the two illumination optical systems 27 and 28 are mutually inclined, the illumination of the region to be imaged is stopped by the corneal endothelium imaging apparatus 1 (FIGS. 1 and 2). An effect equivalent to the case where the image is photographed by switching 22 is obtained.

In the above embodiments, the corneal endothelium photographing apparatus is taken as an example of the eyeball photographing apparatus. However, the present invention can also be applied to an eyeball photographing apparatus for photographing a crystalline lens.

[0049]

According to the eyeball photographing apparatus of the present invention, by switching substantially half of the longitudinal direction of the slit light illuminating the anterior eye from obliquely forward, the same part to be photographed (for example, corneal endothelium) The image of the cell can be observed and photographed before and after the switching. Then, if there is unevenness in the imaging target site, since the shadow of the image of the same site is different before and after the switching, it is possible to determine whether the shadow is caused by the unevenness or the refractive index difference by comparing the two images. Information is obtained.

Further, by switching substantially half of the slit light reflected by the anterior segment in the longitudinal direction and passing the same, it is possible to observe and photograph the image of the region to be photographed before and after the switching. Therefore, if the imaging target portion has irregularities, the shadow of the image of the same portion before and after the switching is different, and the same operation and effect as above can be obtained.

[Brief description of the drawings]

FIG. 1 is a plan view showing a schematic arrangement of a corneal endothelium imaging apparatus which is an embodiment of an eyeball imaging apparatus of the present invention.

FIG. 2 is a perspective view of the corneal endothelium photographing apparatus of FIG.

3 (a), (b) and (c) are diagrams showing an example of a corneal endothelial cell photographed image obtained by the corneal endothelial photographing apparatus of FIG.

FIG. 4 is a plan view showing a schematic arrangement of a corneal endothelium imaging apparatus which is another embodiment of the eyeball imaging apparatus of the present invention.

FIG. 5 is a perspective view of an essential part showing a corneal endothelium imaging apparatus which is still another embodiment of the eyeball imaging apparatus of the present invention.

FIG. 6 is a perspective view of a main part showing a corneal endothelium imaging apparatus which is still another embodiment of the eyeball imaging apparatus of the present invention.

FIG. 7 is a schematic perspective view illustrating a main part of a conventional corneal endothelium photographing apparatus.

FIG. 8 is a view showing an example of a corneal endothelial cell photographed image obtained by a conventional corneal endothelial photographing apparatus.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Corneal imaging device, 2 ... Machine frame, 3 ... Imaging system 4 ... Illumination optical system, 5 ... Imaging optical system, 6
..Focusing optics, 7 ... Strobe discharge tube, 8 ...
Relay lens, 9: slit, 9a: slit plate, 10: projection lens, 11: half mirror, 12: television camera, 12a: light receiving element,
13 ... objective lens, 14 ... half mirror,
15: slit, 16: imaging lens, 17
... Mirror, 18 ... Illumination lamp, 18a ... Condensing lens, 19 ... Focus detection light receiving element, 20 ...
・ Slit, 21 ・ ・ ・ Slit, 22 ・ ・ ・ Aperture,
23 ... light source control means, 25 ... corneal endothelium photographing device, 26 ... corneal endothelium photographing device, 27 ... first illumination optical system, 28 ... second illumination optical system, 29 ... Strobe discharge tube, 30 ... relay lens, 31 ...
Slit, 31a Slit plate, 32 Half mirror, 33 Corneal endothelium photographing device, 34 First illumination optical system, 35 Second illumination optical system, 36
・ Strobe discharge tube, 37 ・ ・ ・ Relay lens, 38 ・
..Slit, 39: half mirror, A: dark area, B: dark area, C: dark area, D
... area, E ... eye to be examined, L ... center axis, T
... Light transmitting part, U ... Light non-transmitting part

Claims (5)

[Claims] 1. An illumination optical system having a slit for illuminating an anterior eye of an eye to be examined from obliquely forward with slit light, and an imaging optical system for photographing the slit light reflected by the anterior eye of the eye to be inspected. An eyeball photographing apparatus comprising: a photographing optical system; and a light beam direction switching unit disposed on an optical axis of the illumination optical system for substantially switching a direction of a light beam passing through a slit. 2. An illumination optical system for illuminating an anterior eye of an eye to be inspected from obliquely forward with slit light, and an imaging unit for imaging the slit light reflected by the anterior eye of the eye to be inspected. A photographing optical system, and a light beam direction switching unit disposed on the optical axis of the photographing optical system, for substantially switching a direction of slit light reflected by the surface of the anterior eye and reaching the photographing unit. An equipped eyeball photographing device. 3. The light beam direction switching means comprises a light transmission limiting plate disposed on the optical axis, and one side of a line passing through the optical axis or near the optical axis of the light transmission limiting plate is light. 3. The eyeball photographing apparatus according to claim 1, wherein the eyeball photographing apparatus is configured to be transparent and the other side is configured to be optically opaque, and is configured to be switchable between the optically transparent and the optically opaque. 4. The eyeball photographing apparatus according to claim 3, wherein the light transmission restricting plate is configured to be rotatable around an optical axis and set at an arbitrary rotational position. 5. A first illumination optical system and a second illumination optical system for illuminating an anterior eye portion of an eye to be examined from diagonally forward with slit light, and the slit light reflected on a surface of the anterior eye portion of the eye to be inspected. A photographic optical system for photographing the object, each of the two illumination optical systems has an illumination light source, a relay lens, and a slit, and further has a shared objective lens, and the objectives of the two slits are provided. An eyeball photographing apparatus, wherein the conjugate points of the lenses are configured to coincide with each other, and the lighting of both illumination light sources is switched.