JPH10192244A - Ophthal mological device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable the indication of a fixation target without forming a branched optical path. SOLUTION: When examining an anterior optic part, optics D for examining the anterior optic part are introduced through the optical path of scanning optics B and a light source 24 for lighting is caused to emit a light. This light for lighting illuminates a visual target member 21 from the side, then proceeds through the interior of the visual target member 21 reaching a fixed visual target and is deflected into a direction in which a vision is tested E by the scattering of the light by the fixed visual target. Further, the light is projected to an ocular fundus in the eye E whose vision is tested through an objective lens 10 and the light is visually recognized by an examinee. On the other hand, the ocular fundus is scanned for examination by retreating the optics D for examining the anterior optic part into the outside of the optical path for the scanning optics B when scanning the ocular fundus for examination.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an ophthalmologic apparatus and a fixation apparatus used for photographing the fundus of an eye to be examined in an ophthalmic clinic or the like.

[0002]

2. Description of the Related Art Conventionally, a fixation lamp of a fundus camera has an optical system branched from a photographing optical system, a target to be a fixation target is arranged in the optical system, and the target is illuminated from behind. Then, the image is projected on the fundus of the eye to be examined.

[0003]

However, in the above-mentioned conventional example, a large space is required for branching the optical path of the optical system in which the fixation target is arranged, and the entire optical system becomes large, so that the operability of the ophthalmologic apparatus is increased. In addition, the use of an optical path switching mirror to split the optical path requires a complicated mechanism, which increases the cost of the apparatus and increases the risk of failure. On the other hand, when the optical path switching mirror is not used, expensive parts such as a wavelength division mirror and a half mirror must be used.
The problem that the product price rises arises.

An object of the present invention is to solve the above-mentioned problems,
It is an object of the present invention to provide an ophthalmologic apparatus that can present a fixation target without forming a branch optical path.

[0005]

According to the present invention, there is provided an ophthalmologic apparatus according to the present invention, comprising: an imaging optical system having an optical member having a diffuse reflection region in at least one portion of a surface far from an eye to be examined; And a light source for illuminating the optical member from the side.

A fixation apparatus according to the present invention is a fixation apparatus used as a fixation target of an eye to be inspected in an ophthalmologic apparatus. The fixation apparatus converts incident light from an end into at least light emitted in the optical axis direction of the ophthalmologic apparatus. It is characterized by having an optical member for conversion.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail with reference to the illustrated embodiment. FIG. 1 shows a configuration diagram of a fundus camera according to an embodiment. On a light path of a fundus illumination optical system A, an observation light source 1 such as a halogen lamp that emits steady light, a condenser lens 2, and an infrared light transmitting visible light. A filter 3 for blocking light, a photographing light source 4 such as a strobe, a lens 5, a diaphragm 6 having a ring-shaped opening, a relay lens 7, a diaphragm 8 having a ring-shaped opening, and a perforated mirror 9 having a central opening are sequentially arranged. Have been.

On the optical path of the fundus photographing optical system B, an objective lens 10, a perforated mirror 9, a focus lens 11 for adjusting the focus by changing the position on the optical axis, a photographing lens 12, and a still image pickup The elements 13 are sequentially arranged. And, between the photographing lens 12 and the image sensor 13,
A switching mirror 14 for branching the fundus image from the photographing optical system B is provided, and a lens 15, a mirror 16, a lens 17, and an image sensor 1 are provided on the optical path of the observation optical system C from the switching mirror 14.
8 are sequentially arranged.

An anterior segment illumination light source 19 is disposed near the objective lens 10, and an anterior segment observation optical system D is disposed between the objective lens 10 and the perforated mirror 9. In the anterior ocular segment observation optical system D, a lens 20, an optotype member 21 having a scattering region serving as a fixation target 21a, an optical member having an image split prism 22 in the center, and a lens 23 are arranged. An illumination light source 24 for illuminating the optotype member 21 from the side is disposed in the vicinity of 21, and these members can be integrally inserted into and removed from the optical path of the photographing optical system B.

FIG. 2 is a front view of the target member 21, and FIG. 3 is a side view thereof. The fixation target 21a is formed by corroding the center of the glass plate with a chemical in the shape of a target, and a white paint as a diffusion member there. And the objective lens 10 and the lens 20
Is disposed at a position substantially conjugate with the fundus of the eye E to be examined. When the working distance (working distance) between the eye E and the objective lens 10 becomes appropriate with respect to the objective lens 10 and the lens 20, the prism 22 is located at a position substantially conjugate with the anterior segment of the eye E. Are located.

The outputs of the image pickup devices 13 and 18 are output to the image processing unit 2.
5 and the output of the image processing unit 25 is the television monitor 2
6, connected to the image memory 27 and the control unit 28. The output of the control unit 28 is connected to the anterior ocular segment observation optical system D and the imaging light source 4, and the outputs of the observation site selection switch 29 and the imaging switch 30 are connected to the control unit 28.

In such a configuration, the photographer is not shown so that the optical axis of the photographing optical system B passes through the center of the pupil of the eye E and the cornea of the eye E and the cornea of the eye E maintain an appropriate distance. The position of the optical system and the eye to be inspected E are aligned while observing the anterior segment by ordinary means. That is, in the anterior ocular segment observation state, the anterior ocular segment observation optical system D is inserted into the imaging optical path, and the light emitted from the anterior ocular segment illumination light source 19 emits the eyelid of the eye E to be examined and its surroundings, Illuminate the anterior segment of the eye, such as the sclera.

The illuminated anterior ocular segment image is formed by an objective lens 10,
The light passes through the lens 20 and the optotype member 21 and once forms an image near the prism 22. The prism 22 separates the image of the anterior segment of the eye, the lens 23, the opening of the perforated mirror 9, the focus lens 11, and the photographing lens 12. , Is reflected upward by the switching mirror 14, forms an image again near the lens 15, passes through the lens 15, is reflected to the left by the mirror 16, and
7 forms an image near the image sensor 18. Then, the anterior eye image is converted into a video signal by the image sensor 18, input to the image processing unit 25, and displayed on the television monitor 26.

Since the prism 22 is arranged at a position where the anterior segment image is formed when the working distance is proper, when the working distance is not proper, as shown in FIG. Are projected to the left and right, but if they are appropriate, the top and bottom of the anterior eye image coincide as shown in FIG. On the surface of the prism 22 opposite to the prism surface, an optotype serving as a reference for positioning the eye E to be inspected and a reference for a pupil diameter that can be photographed is printed. This optotype forms an image near the image sensor 18 through the same optical path as the anterior ocular segment image, and is displayed on the television monitor 26 as an optotype image T together with the anterior ocular segment image as shown in FIGS. Is done. Note that, as shown in FIG.
Is arranged away from the reference target member 21, the image of the anterior segment can be magnified and formed, and more accurate positioning can be performed.

At this time, the subject visually recognizes the fixation target 21a, and the light emitted from the illumination light source 24
Is illuminated from the side, proceeds inside the optotype member 21, reaches the fixation target 21a, is scattered and diffused by the fixation target 21a,
The surface of the optotype member 21 on the side where the fixation target 21a does not exist, the lens 2
0, passes through the objective lens 10 and is projected on the fundus of the eye E to be examined.

If the peripheral portion of the target member 21, ie, the edge portion, is not a polished surface but a rough polished diffusion surface such as frosted glass, the entire diffusion surface serves as a secondary light source, and the fixation target 21a can be further fixed. Bright and uniform illumination can be achieved. In addition, when a plurality of light sources are provided around the optotype member 21 instead of one light source, brighter and more uniform illumination can be achieved.

The fixation target 21a is set to the eye E of the target member 21.
Formed on the surface on the opposite side to the target member 2
The light reflected on the inner surface of No. 1 effectively illuminates the fixation target 21a, and the fixation target 21a can be presented brighter. In addition, the fixation target 21a together with the prism 22
Fixation target 2 formed in the anterior ocular segment image by using
Since the light flux of the 1a image is deflected by the prism 22,
The shadow of the fixation target 21a can be prevented from being reflected on the television monitor 26.

Thus, the eye E and the objective lens 1
When the observation site selection switch 29 is operated after the completion of the alignment of 0, the control unit 28 turns off the anterior ocular segment illumination light source 19, retreats the anterior ocular segment observation optical system D out of the optical path, and sets the observation light source 1 Is turned on to switch to the fundus observation state.

The light emitted from the observation light source 1 is condensed by the condenser lens 2, the visible light is blocked by the filter 3, the strobe light source 4, the lens 5, the opening of the stop 6, the relay lens 7, and the opening of the stop 8. Part of the objective lens 10 is reflected to the left by the mirror part around the perforated mirror 9
Illuminates the fundus from the pupil of the eye E to be examined. The fundus image illuminated in this way passes through the pupil, the objective lens 10, the hole of the perforated mirror 9, the focus lens 11, and the photographing lens 12 again, and is reflected upward by the switching mirror 14,
The light passes through the lens 15, is reflected to the left by the mirror 16, and forms an image on the image sensor 18 by the lens 17.

This image is converted into a video signal in the same manner as the anterior segment image, and is displayed on the television monitor 26 through the image processing unit 25. The photographer observes the fundus image displayed on the television monitor 26, and confirms that the photographed region, the presence or absence of flare, the state of focus, and the like are appropriate, and proceeds to a photographing operation.

When the examiner operates the photographing switch 30, the control unit 28 retracts the switching mirror 14 out of the optical path, the image pickup device 13 starts accumulation of light for photographing a still image, and at the same time, the photographing light source 4 emits light. I do. The light emitted from the imaging light source 4 passes through the lens 5 and then illuminates the fundus through the same optical path as the observation light. The fundus image illuminated in this way is the objective lens 1
0, aperture of apertured mirror 9, focus lens 11,
A still image is formed on the imaging device 13 through the imaging lens 12. This still image is converted into a digital signal, stored in the image memory 27 via the image processing unit 25, and reproduced on the television monitor 26.

In the above embodiment, the fixation target 21a
Is fixed to the anterior ocular segment observation optical system D so as to be inserted into and removed from the photographing optical path together with the anterior ocular segment observation optical system D. Is connected to the anterior ocular segment observation optical system D, which is a movable part, and moving the anterior ocular segment observation optical system D may cause a problem such as disconnection.

Therefore, the illumination light source 24 is fixed not to the anterior eye part observation optical system D but to the housing supporting the photographing optical system B, and is turned on in conjunction with the insertion of the anterior eye part observation optical system D into the optical path. And
The target member 21 is illuminated from the side. With this configuration, the electric wire does not restrict the movement of the movable portion, and the fear of disconnection can be avoided. At this time, when the distance between the light source 24 and the optotype member 12 is long and a sufficient amount of light cannot be obtained, one end of a fiber (not shown) is fixed to the optotype member 21 and the other end is near the light source 24. And the light may be guided from the light source 24 to the side surface of the optotype member 21 via the fiber.
With this configuration, the fiber is inserted and removed together with the optotype member 21, so that there is no possibility that the optical path is obstructed during photographing.

The present invention can be applied not only to a fundus camera but also to other ophthalmologic devices such as a tonometer, a refractometer, and a keratometer.

[0025]

As described above, the ophthalmologic apparatus and the fixation apparatus according to the present invention do not need to form a branch optical path for presenting a fixation target, so that a complicated structure and expensive parts can be used. In addition, a fundus camera that is inexpensive and easy to operate can be provided, and there is no need to dispose a branching member in the optical path.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of a fundus camera according to an embodiment.

FIG. 2 is a front view of a target member.

FIG. 3 is a side view.

FIG. 4 is an explanatory diagram of an anterior ocular segment observation image.

FIG. 5 is an explanatory diagram of an anterior ocular segment observation image.

[Explanation of symbols]

 1, 4, 19, 24 Light source 3 Filter 6, 8 Ring aperture stop 13, 18 Image sensor 21 Optotype member 22 Prism 25 Image processor 26 TV monitor 27 Image memory 28 Controller 29, 30 Switch

Claims (7)

[Claims] 1. An imaging optical system having an optical member having a diffuse reflection area at least at one position on a surface far from an eye to be examined, and a light source for illuminating the optical member from a side. Ophthalmic equipment. 2. The ophthalmologic apparatus according to claim 1, wherein the diffuse reflection region is formed by a diffusion member. 3. The ophthalmologic apparatus according to claim 1, wherein a side surface of the optical member is a diffusion surface. 4. The ophthalmologic apparatus according to claim 1, wherein the optical member having the diffusion area is disposed so as to be detachable from the photographing optical system, and the light source is fixed to the photographing optical system. 5. The ophthalmologic apparatus according to claim 4, wherein the light from the light source is guided by a light guide member fixed to the detachable optical member. 6. A fixation device used as a fixation target of an eye to be examined in an ophthalmologic apparatus, comprising an optical member for converting incident light from an end into at least light emitted in the optical axis direction of the ophthalmic apparatus. A fixation device. 7. The fixation device according to claim 6, wherein the optical member has a region for diffusing and reflecting incident light from the end portion to generate light emitted at least in an optical axis direction of the ophthalmic apparatus.