JPH1128189A - Ophthalmology device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an ophthalmology device at a low cost which can simply change magnification by reducing optical and mechanical constituting parts. SOLUTION: The image of the eyeground of an illuminated eye to be examined E is picked up by a CCD camera 30 and a video signal from this CCD camera 30 is electronically varied by a video variable magnification circuit 31. This varied video signal is displayed as a visible image by a monitor 33. In constitution like this, as the eyeground of the eye to be examined can be made electronic video to be electrically varied, the optical and mechanical constituting parts for varying are unnecessitated to obtain the ophthalmology device at a low cost. In addition, as variable magnification can be executed electrically, usability is remarkably improved.

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 more particularly, to an ophthalmic apparatus for imaging a fundus of a subject's eye.

[0002]

2. Description of the Related Art In a conventional fundus camera, a fundus of an eye to be examined is illuminated by an illumination optical system, a fundus image is imaged using an imaging device such as a CCD camera, and the image is displayed on a monitor for observation. Have been.

[0003]

In such a conventional fundus camera, the magnification of the fundus image is changed or the viewing range is changed by optically scaling the fundus image.
In such a method, it is necessary to mechanically fluctuate the optical system in order to optically change the magnification. This increases the number of mechanical parts and optical parts, complicates the configuration, and increases the cost. Was. In addition, optical zooming often requires the skill of the user, and is not very easy to use.

SUMMARY OF THE INVENTION Accordingly, the present invention has been made to solve such a problem, and it is an object of the present invention to provide a low-cost ophthalmic apparatus in which the number of optical and mechanical components can be reduced and the magnification can be easily changed. Make it an issue.

[0005]

SUMMARY OF THE INVENTION In order to solve this problem, the present invention provides means for electronically imaging the fundus of a subject's eye illuminated via an illumination optical system, and electronically converting the electronic image of the fundus. And a means for displaying a scaled electronic image of the fundus as a visible image.

In such a configuration, since the fundus of the eye to be inspected can be converted into an electronic image and electrically scaled, optical and mechanical components for zooming are not required, and a low-cost ophthalmic apparatus is used. Is obtained.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to the embodiments shown in the drawings. Hereinafter, the ophthalmologic apparatus will be described as an example of a fundus camera.

The fundus camera shown in FIG.
The light from the light source 11 of the illumination optical system 10 passes through the lens 13, the mirror 14, and the lens 15 together with the light partially reflected by the mirror 12, and passes through the perforated mirror 16. After being reflected, the subject's eye E
Incident on the fundus.

The fundus illuminated by the illumination optical system 10 passes through a hole in a perforated mirror 16 through a lens 17 and passes through lenses 21 and 22 of a photographing optical system 20 to a CCD camera 30.
The image is formed on an image pickup device exemplified as “1”.

The CCD camera 30 is connected to an image scaling circuit 31. The image magnification circuit 31 temporarily stores the image signal of the fundus oculi imaged by the CCD camera 30 into a built-in memory (not shown).
And has the function of scaling it. A control circuit 32 is connected to the image scaling circuit 31, and a scaling setting circuit 34.
The scaling of the video signal is controlled in accordance with the scaling factor set in.
A monitor 33 is connected to the image scaling circuit 31 to visualize the scaled image signal of the fundus and display a fundus image.

In such a configuration, when performing ophthalmological measurement or observation, the light source 11 is turned on, the light emitted from this light source is projected to the eye E by the illumination optical system 10, and the fundus of the eye is irradiated. You. The light reflected by the fundus of the eye E enters the CCD camera 30 via the photographing optical system 20, and forms a fundus image. The signal converted into an electronic image by the CCD camera 30 is input to the image scaling circuit 31 and is temporarily stored in its built-in memory. The control circuit 32 enlarges or reduces the image stored in the memory according to the scaling ratio set by the operator via the scaling setting circuit 34, for example. The scaled fundus image is displayed on the monitor 33 as a visible image, and can be observed or confirmed. If the magnification is insufficient, the optimal magnification may be set again via the magnification setting circuit 34.

[0012]

As described above, according to the present invention, since the fundus of the eye to be examined can be converted into an electronic image and electrically scaled, optical and mechanical components for zooming are not required. Thus, a low-cost ophthalmic apparatus can be obtained. Further, since the magnification can be electrically changed, usability can be remarkably improved.

[Brief description of the drawings]

FIG. 1 is an optical diagram showing an overall configuration of an ophthalmologic apparatus according to the present invention.

[Explanation of symbols]

 Reference Signs List 10 illumination optical system 20 shooting optical system 30 CCD camera 31 video scaling circuit 32 control circuit 33 monitor 34 scaling setting circuit

Claims (1)

[Claims] An electronic image of a fundus of an eye to be inspected illuminated through an illumination optical system, an electronic image of the electronic image of the fundus, and an electronic image of the reconstructed fundus. An ophthalmologic apparatus comprising: means for displaying a visible image.