JPH0866372A - Eyeground image device - Google Patents

Abstract

PURPOSE: To enable one eyeground image device to have both mydriatic and non-mydriatic photographing functions. CONSTITUTION: A reflected beam coming from an eyeground due to an observation light source 2 is incident on an observation TV camera 14 and an eyeground image is shown on a liquid crystal display panel 21. A tester observes the eyeground image and operates a handle 19 for positioning or focusing an inspected eye E. Then, the tester presses a photographing button 18 and actuates a springing-up mirror 12. A photographing light source 5 emits light synchronously with the operation of the mirror 12, and a camera 13 photographs the eyeground image. At the photographing process, the light quantity of a light source 27 for a fixing light 24 is adjusted, depending on whether photographing mode is mydriatic or non-mydriatic, and a visible light cutting filter 9 is mounted or demounted accordingly.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fundus imaging apparatus used in, for example, an ophthalmic hospital.

[0002]

2. Description of the Related Art As a conventional fundus imaging apparatus, there are known a mydriasis fundus imaging apparatus that performs imaging using a mydriatic agent and a non-mydriasis fundus imaging apparatus that performs imaging with a natural pupil. In the mydriasis fundus imaging apparatus, an external fixation lamp having a light source such as an LED or a lamp attached to the tip of a rod is used, and the external fixation lamp is gazed at by the eye not photographing. In addition, in the non-mydriasis fundus imaging apparatus, an internal fixation lamp is used for imaging.

[0003]

However, in the above-mentioned conventional example, the mydriasis imaging and the non-mydriasis imaging must be performed by using different fundus imaging devices. Further, in the non-mydriatic photography, the method of directly gazing at the external fixation lamp has a problem that the light source can be seen by both eyes of the subject when photographing the periphery of the fundus, which causes miosis due to near vision. is there.

The object of the present invention is to solve the above-mentioned problems,
Provided is a fundus imaging apparatus capable of performing both mydriasis imaging and non-mydriasis imaging with a single fundus imaging apparatus and capable of imaging the periphery of the fundus without causing miosis in the non-mydriasis imaging. Especially.

[0005]

A fundus imaging apparatus according to a first aspect of the present invention for achieving the above object is an infrared light observing means for observing an eye to be inspected with infrared light, and an eye to be inspected with visible light. It has a visible light observing means, an image forming means for obtaining a fundus image of the eye to be inspected, and a fixation lamp with an adjustable light amount.

The fundus imaging apparatus according to the second aspect of the invention is an external fixation lamp comprising infrared light observing means for observing the eye to be inspected with infrared light, image means for obtaining a fundus image of the eye to be inspected, and a distant light beam. And having.

[0007]

The fundus imaging apparatus according to the first aspect of the present invention having the above-described structure increases the light amount of the fixation lamp so that the subject can gaze at the time of mydriasis imaging, and brightens it at the time of nonmydriatic imaging. Decrease the light intensity of the fixation lamp to make it darker.

The fundus imaging apparatus according to the second aspect of the present invention is the non-mydriasis fundus imaging apparatus, in which an external fixation lamp made of a distant light beam is provided to gaze at the distant light beam, so that it can be seen only by one eye of the subject. It does not cause miosis due to near vision.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail based on the illustrated embodiments. FIG. 1 is a configuration diagram of the first embodiment, in which a lens 3, a mirror 4, a strobe light source, etc. are provided on an optical path O1 from an observation light source 2 such as an incandescent lamp or the like inside a housing 1 to an eye E to be inspected. A photographing light source 5, a relay lens 6, a perforated mirror 7, and an objective lens 8 are sequentially arranged. Further, a visible light cut filter 9 that blocks visible light is disposed between the mirror 4 on the optical path O1 and the photographing light source 5 so as to be freely inserted and removed. In addition,
The light source 5 for photographing is conjugated with the light source 2 for observation by the lens 3.

On the optical path O2 behind the perforated mirror 7, a focus lens 10, a taking lens 11, a flip-up mirror 12, and a camera 13 composed of a film camera, an electronic camera or the like, which are movable along the optical path O2, are sequentially arranged. An observation television camera 14 having a sensitivity to infrared light and visible light is arranged in the reflection direction of the flip-up mirror 12.

The housing 1 has a base 1 with the shaft 15 as a center.
It is configured to be freely rotatable in the horizontal direction on the slide table 17 placed on the lens 6, and it is possible to take an image around the fundus of the eye E to be inspected. Furthermore, the direction can be freely changed through the handle 19 having the photographing button 18 on the sliding base 17 and the joint 20 fixed to the sliding base 17,
A liquid crystal display board 21 for displaying an image obtained by the observation television camera 14 is provided. The lower right part of the housing 1 is cut so that the housing 1 does not come into contact with the liquid crystal display plate 21 when the housing 1 is rotated. Since the liquid crystal display plate 21 does not rotate together with the housing 1 when taking a picture around the fundus, the examiner can take a picture in the same posture.

A face support 22 is attached to the base 16, and a fixation lamp 24 whose position can be adjusted by a joint rod 23 is attached to the face support 22. This fixation light 2
Reference numeral 4 is composed of a lens 25, an optotype plate 26 provided on the focal plane of the lens 25, and a light source 27 for a fixation lamp such as a red LED whose light quantity can be adjusted depending on whether mydriasis photographing or non-mydriasis photographing is performed. Note that the light source 27 for the fixation lamp may be darkened and emits a colored light beam so that the light can be gazed at. In particular, red light is not dazzling and is conspicuous, which is preferable. Also, the optotype plate 2
6, a small opening 26 is formed at the center of the optotype plate 26 as shown in FIG.
a is provided, and the light flux from the light source 27 for fixation lamps that has passed through the small opening 26a is projected from a distance by the lens 25 as a visual target, and the subject has a small light spot in the distance. It is designed to look closely.

At the time of mydriasis imaging, the examiner adjusts the emitting direction of the fixation lamp light source 27 of the fixation lamp 24 by the joint rod 23, and the examinee puts his chin on the face cradle 22 and fixes the fixation lamp 24. To observe. Since the small light spot at the center of the optotype plate 26 can be seen even if it is blurred,
The diopter is fixed by distance projection regardless of the diopter of the subject. Further, since the visible light cut filter 9 is retracted from the optical path O1 to illuminate the subject's eye E with visible light, even if the subject's eye is shown to one eye, it is used for fixation lights The light amount of the light source 27 is adjusted.

The light beam from the observation light source 2 passes through the lens 3 and is reflected by the mirror 4, forms an image near the photographing light source 5, passes through the relay lens 6 and is reflected by the peripheral portion of the perforated mirror 7, and the objective. The light enters the pupil of the eye E through the lens 8 and illuminates the fundus of the eye E. The reflected light flux at the fundus returns through the same optical path, and the aperture of the perforated mirror 7 and the focus lens 1
0, passing through the taking lens 11, reflected by the flip-up mirror 12 and entering the observation TV camera 14, and the liquid crystal display panel 2
A fundus image of the eye E to be inspected is displayed on the screen 1. The examiner observes the fundus image on the liquid crystal display plate 21, operates the handle 19 to align and focus the eye E to be inspected, and then presses the photographing button 18. At the same time, in synchronization with the flip-up of the flip-up mirror 12, the light source 5 for photography emits light, and the fundus image is captured by the camera 13.

During non-mydriatic photography, it is inconvenient for the subject to have a dilated pupil if the fixation light source 27 is bright, so the fixation light source 27 is made relatively dark and the visible light cut filter 9 is used. Is inserted on the optical path O1 to illuminate the fundus with infrared light, and the photographing is performed in the same manner as the mydriasis photographing.

Although the camera 13 is used for recording the fundus image, the observation television camera 14 may be used for both observation and recording of the fundus image. Further, the fundus image obtained by the observation television camera 14 may be recorded as a moving image using the observation light source 2, or may be recorded as a still image in synchronization with the light emission of the photographing light source 5. In this case, if a frame memory is provided, it functions as a buffer for an external magneto-optical desk or the like. Further, in association with the insertion / removal of the visible light cut filter 9, the light source 27 for the fixation lamp may be automatically set to the brightness for the mydriasis photographing and the non-mydriasis photographing.

FIG. 3 is an explanatory view of the fixation lamp 24 according to the second embodiment. As shown in FIG. 4, in addition to the optotype plate 26 at the focal point of the lens 25, a position substantially conjugate to the eye E to be inspected. An aperture plate 30 is arranged. The aperture plate 30 is provided with a plurality of small apertures 30a at intervals of 4 to 5 mm, and the subject's pupil is 4 to 5 mm. Therefore, one of the small apertures 30a of the aperture plate 30 passes through the small aperture 26a of the optotype plate 26. The examinee gazes at the luminous flux from the eye as an optotype, and regardless of the diopter of the examinee, the optotype presented at a distance can be observed without blurring. The optotype does not necessarily have to be the small light spot.

When photographing the vicinity of the fundus of the eye E by non-mydriatic photography, the subject can gaze with both eyes because it is illuminated with infrared light and is not dazzling. However, in reality, since the light flux from the fixation lamp 24 is only a light flux parallel to the optical axis of the lens 25, it can be focused only on one eye of the subject.

FIG. 5 is an explanatory view of the fixation lamp 24 of the third embodiment, in which the lens 25 is movable in the direction of the arrow by the actuator 31 so that it can be adjusted to the diopter of the subject. Has become. In addition, the focus lens 10
The diopter of the subject can be changed in association with the, and the fixation target 24 can always present the optotype according to the diopter of the subject.

Although the fundus imaging apparatus is used in this embodiment, an off-salmoscope may be used if only the fundus image is observed. Further, when performing the alignment and the focus adjustment, it is not always necessary to observe the fundus, and the anterior segment of the eye E may be observed.

[0021]

As described above, in the fundus imaging apparatus according to the first aspect of the invention, the brightness of the fixation lamp can be adjusted so that the subject can gaze at the time of mydriasis photography, and the subject can be adjusted at the time of nonmydriasis photography. Since the brightness can be adjusted so as not to cause miosis, both mydriasis photography and non-mydriasis photography are possible.

In the fundus imaging apparatus according to the second aspect of the invention, the visual target of the external fixation lamp is focused only on one eye of the subject,
Since a fixation lamp using a distant light beam is used, it is possible to take an image without reducing the pupil.

[Brief description of drawings]

FIG. 1 is a configuration diagram of a first embodiment.

FIG. 2 is a front view of an optotype plate.

FIG. 3 is a configuration diagram of a fixation lamp according to a second embodiment.

FIG. 4 is a front view of an aperture plate.

FIG. 5 is a configuration diagram of a fixation lamp according to a third embodiment.

[Explanation of symbols]

 1 Case 2 Light source for observation 5 Light source for photography 9 Visible light cut filter 12 Mirror for flipping up 13 Camera 14 Television camera for observation 17 Slide stand 18 Shooting button 19 Handle 21 Liquid crystal display plate 24 Fixing light 26 Optotype plate 27 Solid Light source for eye light 30 Aperture plate

Claims (4)

[Claims] 1. An infrared light observing means for observing an eye to be inspected with infrared light, a visible light observing means for observing the eye to be inspected with visible light, an image means for obtaining a fundus image of the eye to be inspected, and a light amount can be adjusted. Fundus imaging apparatus having a fixed fixation lamp. 2. The fundus imaging apparatus according to claim 1, wherein the light amount of the fixation lamp is adjusted in accordance with switching between the infrared light observing means and the visible light observing means. 3. An eye fundus image, comprising infrared light observation means for observing the eye to be inspected with infrared light, image means for obtaining a fundus image of the eye to be inspected, and an external fixation lamp composed of a distant light beam. apparatus. 4. The fundus imaging apparatus according to claim 3, wherein the external fixation lamp emits colored light.