JPH1170080A - Ophthalmological photographing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable an ophthalmic camera to easily focus on a desired position, by imaging an area illuminated by an illuminating means to illuminate a subject eye and displaying the image in different magnifications on plural areas. SOLUTION: Illuminating light from an eyeground illuminating optical system is reflected by an aperture mirror 2 and illuminates the eyeground Er through an objective lens 1. The light reflected by the eyeground Er is imaged by a CCD camera 8 as an eyeground image through the objective lens 1, an aperture of the aperture mirror 2, a lens optical system 3, a switching mirror 4, a mirror 6, and a lens 7, and the image is passed through an A/D converter in a magnification changing part 9 and stored in a memory as a digital image. A display magnification corresponding to each area is preliminarily set in the magnification changing part 9 and the magnification of the image stored in the memory is changed based on the setting. The magnification changed image is converted to analog signals by a D/A converter in the magnification changing part 9 and displayed on plural areas on a monitor 10 in different magnifications.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an ophthalmologic photographing apparatus for photographing a fundus of a subject's eye, for example.

[0002]

2. Description of the Related Art Conventionally, focus adjustment in a fundus camera has been performed using a split luminescent line or the like as disclosed in Japanese Patent Publication No. 57-13294.

[0003]

However, in the above-described conventional method using the split bright line, the fundus region used for focusing is limited to a predetermined minute region at the center of the screen. For this reason, for example, when photographing a case in which a large number of three-dimensional lesions such as edema seen in senile discoid macular degeneration and edema seen in the periphery of the retina can be confirmed, lesions are sequentially placed in the center of the screen. Since it is necessary to guide the eye to be examined so that the part comes, and to perform focusing after dividing into a plurality of frames, the operation becomes complicated.

An object of the present invention is to solve the above-mentioned problems,
An object of the present invention is to provide an ophthalmologic photographing apparatus that can easily focus on a desired site.

[0005]

According to the present invention, there is provided an ophthalmologic photographing apparatus for illuminating an eye to be inspected, an imaging means for imaging an area illuminated by the illuminating means, At least two images taken by the means
Display means for displaying in one or more areas at different magnifications.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail with reference to the illustrated embodiment. FIG. 1 is a configuration diagram of an ophthalmologic photographing apparatus according to an embodiment. On an optical path O of an objective lens 1 facing an eye E, a perforated mirror 2 conjugate to the anterior segment of the eye E and a lens optical system 3 are provided. , A switching mirror 4 and a film 5 are sequentially arranged. A mirror 6, a lens 7, and a CCD camera 8 are arranged in the reflection direction of the switching mirror 4. The output of the CCD camera 8 is connected to a magnification changing unit 9 and a monitor 10 in order. The output of the magnification setting unit 11 is connected.

Illumination light from a fundus illumination optical system (not shown) is reflected by a perforated mirror 2 and illuminates the fundus Er via an objective lens 1. The reflected light from the fundus Er is captured as a fundus image by the CCD camera 8 via the objective lens 1, the hole of the perforated mirror 2, the lens optical system 3, the switching mirror 4, the mirror 6, and the lens 7, and the magnification changing unit. After passing through an A / D converter (not shown) in 9, the digital image is stored in a memory. A display magnification corresponding to each area is set in advance in the magnification changing unit 9 as shown in FIG. 2, and the magnification of the stored image is changed based on this setting.

At this time, as for the displayable area caused by the magnification change, only the area reduced by the magnification from the center of the image can be displayed. For example, if you set the magnification to 2 times,
As shown in FIG. 3, the character of "1" is enlarged twice and only the central portion is displayed. Note that, instead of changing the display area around the center of the image, the display area may be changed around an arbitrary part. When changing the setting state in the magnification change unit 9, the magnification setting unit 11 specifies a region and sets a display magnification for each region. The area can be set to any figure such as a rectangle, a circle, an ellipse, and a polygon, and the settable magnification is not limited to a natural number and may be specified by a decimal number.

The image whose magnification has been changed is displayed on a monitor 10 after being changed into an analog signal by a D / A converter in a magnification changing section 9. The fundus image continuously captured by the CCD camera 8 is displayed on the monitor 10 immediately after the magnification is changed via the magnification changing unit 9.
The photographer adjusts the aperture and focuses while referring to the display image on the monitor 10 as shown in FIG. 4, and performs photographing by pressing the photographing switch.

Further, with the recent increase in the definition of the CCD camera, a high definition CCD exceeding the displayable resolution of the monitor 10 is required.
A camera can also be used. In this case, since all the constituent pixel data of the captured fundus image cannot be displayed, the data is thinned out and displayed. At this time, the displayable area becomes smaller in the setting area, but the data set by the CCD camera is displayed as it is in this area, and the other areas are set by the magnification setting unit 11 so as to be thinned out. It is also possible.

[0011] It should be noted that instead of shooting on the film 5,
The image may be recorded as an electronic image on an electronic image sensor or the like. The same effect is obtained not only in the fundus camera but also in ophthalmic devices such as a slit lamp and a fundus perimeter.

[0012]

As described above, the ophthalmologic photographing apparatus according to the present invention has at least two images captured by the imaging means.
By displaying at different magnifications in one or more areas, it is possible to easily focus on the site of interest without moving the line of sight of the subject's eye even when the site of interest is in the vicinity when focusing. Can be. Further, since the split projection optical system is unnecessary, the configuration can be simplified.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of an embodiment.

FIG. 2 is an explanatory diagram of a magnification setting of a magnification changing unit.

FIG. 3 is an explanatory diagram of a magnification change of 2 times;

FIG. 4 is an explanatory diagram of a fundus image on a monitor.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Objective lens 2 Perforated mirror 3 Lens optical system 4 Switching mirror 5 Film 8 CCD camera 9 Magnification change part 10 Monitor 11 Magnification setting part

Claims (1)

[Claims] An illumination unit for illuminating an eye to be examined, an imaging unit for imaging an area illuminated by the illumination unit, and a display for displaying an image captured by the imaging unit in at least two or more regions at different magnifications. An ophthalmologic photographing apparatus comprising: