JPS5951832A - Eye bottom camera - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a fundus camera for observing and photographing images of the fundus of an eye to be examined.
Although there are fundus cameras for observing and photographing the fundus, there are no fundus cameras capable of observing and photographing the fundus. However, observing and photographing a slit image of the fundus is absolutely necessary in order to precisely examine the tomography near the retina. If the observation is limited to the slit image of the fundus, it is conventionally possible to use a slit lamp with a contact lens or ruby lens attached to the eye to be examined. This is because the illumination light used to illuminate the fundus of the eye is reflected on the surface of the lens.

This reflected light makes it extremely difficult to observe the fundus.
! It requires considerable skill to observe. Furthermore, in the conventional slit image observation method, the field of view is narrow, so it takes a lot of time to find the affected area, and the patient has to wear a contact lens or the like on the eye, which puts a heavy burden on the patient. will be applied. therefore. Development of a fundus imaging device that can remove light reflected by the cornea of the eye to be examined, has a wide observation field, and does not require the patient to wear contact lenses, etc. desired.

The purpose of this invention does not require any skill.

In addition, we have developed a fundus camera that enables slit image observation and photography of the fundus without placing the burden of wearing contact lenses on the subject, and allows for precise examination of cross-sections near the retina with a wide field of view. The purpose is to offer one pair.

The fundus camera of the present invention includes an illumination system that illuminates the fundus of the eye to be examined through a ring-shaped aperture diaphragm, and an observation/photographing system that photographs the thus illuminated fundus. The illumination system is constructed by disposing a slit diaphragm with a variable slit width at a military position between the fundus and the eye fundus. The bottom of III↓ is illuminated through a ring-shaped aperture diaphragm placed at a certain position. Then, the fundus illuminated in this way is formed in the anterior segment of the subject's eye.
The light flux passing through the center of the aperture image reaches the focusing lens of the observation/photographing system, and then is imaged onto a film or the like by the imaging lens. At this time, since the image of the fundus reaches the observation/photographing system by a light beam passing through the center of the light beam for fundus illumination, the light beam for fundus observation/photography does not interfere with the illumination light beam. and,
Fundus Surin 1 - The slit diaphragm for image observation and photography is placed at a conjugate position with the fundus in the illumination system.
The observation/photography system makes it possible to observe and photograph the Surin 1-image of the fundus.

Embodiments of the fundus camera of the present invention will be described below with reference to the drawings.

First, the illumination system consists of a concave mirror 1, an observation light source 2, a condenser 3, a photographic light source 4, a condenser 5, a reflecting mirror 6, a ring-shaped aperture diaphragm 7, a lens 8, and a diaphragm 1, as shown in the first diagram. 9, an aperture 10, a relay lens 11, and a reflecting mirror 12 having an aperture 12a in the center. Here, the observation light source 2 is placed conjugate to the photographing light beam 4 by the condenser 3, and the ring-shaped aperture diaphragm 7 has a lower ring spacing a as shown in the fourth figure. This link diaphragm 7 is arranged at a position conjugate with the anterior segment of the subject's eye. Instead of the ring-shaped aperture diaphragm 7, it is also possible to use a sector-shaped aperture diaphragm 7' having a sector-shaped opening lower part 'a (see Figs. 5 and 6), so that they can be used interchangeably. It is desirable to do so. The shape of this aperture does not need to be fan-shaped, and may be any shape that approximately fits the opening of the ring-shaped aperture diaphragm. However, when using the fan-shaped aperture 1:1 diaphragm 7', the fan-shaped aperture 7' is also configured to rotate in conjunction with the rotation of the slit diaphragm 9, which will be described later, so that the fan-shaped aperture r, :I7 'a
The direction of the slits must match the directions of the slits of the slits 1 to 9. Next, the slit diaphragm 9 has a variable width 11 as shown in the second diagram, and is further rotatable about the optical axis R'i. This slit/diaphragm 9 is arranged between the relay lenses 8 and 11 and at a conjugate position with the fundus 1 of the eye E to be examined. The slit aperture 9 can vary the size of the slit width 1-1 by relatively displacing the two shielding plates 9a and 9b. It can also be configured with an aperture. Surin 1 - Aperture 9 is open [
One diaphragm 10 is arranged in parallel, and the open I diaphragm 10 has a variable opening area 10a as shown in the third diagram. This aperture stop 10 allows the length of the slit 1 to the stop 9 in the longitudinal direction to be changed.

Note that this aperture diaphragm 10 is opened when observing and photographing a wide area of the fundus of the eye.

Next, the observation/photography system includes an objective lens 13, a photographic aperture 14, a focusing lens 15, an imaging lens 6, a flippable mirror 17, a mirror 17, a mirror 17, a mirror 17, a mirror 17, a mirror 17, a mirror 17, a mirror 17, a mirror 17, a mirror 17, a mirror 17, a mirror 17, a mirror 17, and a mirror 17 that can be flipped. 1 - Consists of a lens 18, a prism 1119, and an eyepiece 20. Reference numeral 21 denotes a film, in which the focusing lens 15 is movable along the optical axis R in the A-A'direction; When focusing, use Surin 1 - aperture 9 and aperture 10 aperture 10.
and are linked to the focusing lens 15. As a result, pin 1 of the observation/imaging system is placed on the fundus E1 of the eye E to be examined.
- is correct, Surin 1 - Diaphragm 9 will also be imaged on the fundus E1.

The action will be explained below.

Ordinary fundus photography is performed by widening the slit diaphragm 9 and the 1" aperture 10. That is, the light emitted from the observation light source 2 is once formed into an image at the position of the photographing light source 4 by the condenser 3, and reaches the link-shaped aperture stop 7 via the condenser 5 and the reflecting mirror 6. And a link-shaped aperture diaphragm 7
The light, which has become an annular illumination light beam due to the soft link lower al, passes through the relay lens 8.degree. 11, reaches the reflecting mirror 12, and is reflected there toward the eye E direction. In this way, the illumination light flux directed toward the eye to be examined E is directed to the objective lens 13, the eye to be examined]
The cornea IΣ2 and the fundus E] are irradiated via the crystalline lens E3.

The image of the fundus E1 irradiated in this way is directed to the outside of the eye E to be examined, and is once viewed by the objective lens 13 at X1. After being imaged, it passes through the aperture 12a of the reflecting mirror 12 and reaches the photographic aperture 14.

Then, the focusing lens 15, the imaging lens 1G, and the mirror 17
After that, the image is formed on the film 21 or at a conjugate position with the film 21, and is then photographed or observed with the naked eye 1. This state is shown in Figure 8 (a) and (b);
In the same figure (b), 22. '22 represents the three protruding parts of the retina within the vitreous body. As is clear from FIGS. 8(a) and 8(b), it is possible to obtain an extremely wide observation field at the stage of normal fundus observation and photography.

Next, the procedure for observing and photographing a slit image of the fundus E1 will be explained. In this case, first, the normal fundus wA mentioned above.
As in the case of observation and photographing, the fundus E1 is illuminated with the aperture 9 and the aperture diaphragm 10 wide open for Surin 1, and as shown in Fig. 8 (a),
As shown in (b), observe the fundus in a wide observation field.

Then, when the part of the fundus in which images of the fundus should be photographed is determined through this observation of the fundus, the eye E to be examined is guided so that the part is located in the center of the observation field. Next, the slit diaphragm 9 and the aperture diaphragm 10 are adjusted to obtain an appropriate slit width I'', length, and direction, and a slit image of the fundus E1 is observed and photographed. FIG. 7 shows the state of the luminous flux. S is an illumination light flux to the Surin 1, and I( is a light flux for observation and photographing. In this case, a fan-shaped aperture diaphragm is used.

The fundus images at this time are shown in FIGS. 8(C) and (D). In the same figure (d), 22.22 represents the part where the retina protrudes into the vitreous body. At this time, the slit diaphragm 9 and the aperture diaphragm ] 0 are configured to be displaced to a conjugate position with the fundus E1 in conjunction with the focusing lens 15, so that the image of the fundus E1 is transferred to the film 21 or 21
The image is formed at the conjugate position. Therefore, it is possible to photograph the Surin 1-image of the fundus E1 and observe it with the naked eye. When observing and photographing a slit image of the fundus E1, the protruding portion 22. '22, the condition can be clearly understood (see Figure 8 (d)).

- In the above explanation, by opening the diaphragm 10, the eye can be seen in a wide field of view. After guessing A, this Surin 1-
[11] of the aperture 10 is adjusted, and the aperture diaphragm and a plurality of sulins 1 having various widths are arranged in the circumferential direction on a rotating disk, and a predetermined aperture is selected by rotating this disk. Needless to say, it is also possible to construct a predetermined observation field and Surin I-rb by inserting it into the optical path.

As shown in FIG. 9(a), the JL has a structure in which the diaphragm 9 to the Surin 1 can be displaced in the direction of the B-B' force in a plane perpendicular to the optical axis R1, and the Surin l-image 23 is in the same figure. As shown in (b) and (c), l+3'! Since it can move within the field of view, scanning of the slit image becomes possible.

Further, as shown in FIG. 10, if the amount of movement of the sulin 1 and the diaphragm 9 in the 0 direction is increased, the sulin 1 can be used as a lamp.

As explained above, according to the fundus camera of the present invention, Wt observation and photography of the slit 1 to image of the fundus can be performed by normal fundus camera operations, and therefore observation and photography of the slit formation of the fundus can be performed.
It does not require any skill to take pictures, and since it has a wide observation field, it has the effect of being able to reliably visualize the affected area in a short time.

Furthermore, by separating the illumination light flux from the observation/photography light flux, it becomes possible to reliably remove reflected light from the cornea, etc., and there is no need for the subject to wear lenses etc. on the contact lens 1. This has the effect of not placing a large burden on the subject. .

[Brief Description of the Drawings] Fig. 1 is a plan view showing the schematic configuration of the fundus camera of the present invention, Fig. 2 is a normal view of the slit diaphragm, Fig. 3 is a front view of the aperture diaphragm, and Fig. 4 is a ring Buddhist temple. The front view of the mouthprint, Figures 5 and 6 are the front views of the fan-shaped aperture diaphragm, and Figure 7 (A).
8 is a cross-sectional view of the eye to be examined showing the intraocular light flux, (b) is a front view of the fundus, (c) is a front view of illumination light on the corneal surface.
Figures (a) and (b) are front views of the observation field in normal fundus photography, (c) and (d) are front views of the observation field in slit image photography of the fundus, and Figure 9 (a) is a front view of the observation field in wl observation field in normal fundus photography. - A plan view of the main parts of a fundus camera that enables image scanning, (
(b) and (c) are front views of the observation field showing the scanning state of the slit image, and FIG. 10 is a plan view of a main part of a modification of the present invention in which the Surin 1-diaphragm is used as a slit lamp. Iζ... Eye to be examined, El... Fundus, 1-11... Illumination system, 13-21... m-detection/photography system, 7... Ring soft ['' aperture, 7'... Fan Shape aperture diaphragm, 9... Surin 1 to diaphragm, IO... Open 1-1 diaphragm, 15... Focusing lens (focusing member). Figure 2 Figure 311 (0) Figure 6 Figure 7 (A) (C) Figure 8 (A) (B) 2 (C) (D) 2 Figure 9 (0) (C) figure

Claims (1)

[Scope of Claims] (1) An illumination system that illuminates the fundus of the eye to be examined through a link-like iris diaphragm, and observation of the illuminated fundus. A fundus camera having an observation/photographing system for photographing; and a sulin 1-diaphragm having a variable width disposed in the illumination system at a conjugate position with the fundus. fundus camera. (2) Opening/closing 1'-1 aperture diaphragms from Surin 1 to L are arranged in parallel. The aperture diaphragm is linked to the focusing member of the observation/photographing system, and the optical axis direction 1 of the illumination system is
The fundus camera according to claim 2, which is movable (.1) The fundus camera according to claim 3, which is rotatable. (5) The fundus camera according to claim 1, wherein the illumination system has a link-shaped aperture and one aperture is interchangeable with a fan-shaped aperture. (6) Open 1-1 aperture that can be opened and closed to Surin L-aperture 1)
The fundus camera according to claim 5, wherein rξ is set to tJ. (7) A fundus camera according to claim 6, in which the first aperture and the first aperture are interlocked with a focusing member of the observation/photographing system to be displaceable in the optical axis direction of the illumination system; (8) The fundus camera according to claim 7, in which the Surin 1-diaphragm is rotatable. (9) The fan-shaped 11 diaphragm is provided in the same aperture direction as the slit diaphragm, and the fan-shaped aperture diaphragm is provided in the slit diaphragm. - The fundus camera according to item 8, which has a function of rotating in conjunction with the aperture.