Ophthalmologic photographing apparatus

Details Ophthalmologic photographing apparatus Ophthalmologic photographing apparatus

1987-12-30

1988-09-27

Bovernick, Rodney B.

Optics: eye examining, vision testing and correcting

Eye examining or testing instrument

Objective type

354410, 354 62, A61B 314, G03B 2900, G03B 700

Patent

active

047737492

ABSTRACT:
An ophthalmologic photographing apparatus is disclosed. It comprises an observation light source for illuminating an eye to be tested; an observation optical system for forming an observation image of the eye to be tested and a corresponding image optically conjugate to the former; a photograph light source; a photograph device for photographing the eye to be tested; a light measuring device formed of a number of light receiving elements for dividing the corresponding image into a number of picture elements in order to measure the light volume per each picture element. The light receiving elements being disposed at a position where the corresponding image is formed. An indicator formed of a number of indicating elements corresponding to the light receiving elements and disposed at a position where the observation image is formed or otherwise at a position conjugate thereto. The apparatus further includes a proper exposure value set-up device comprising an exposure value set-up circuit, light volume comparator and an indicator actuating circuit for actuating the indicating elements, and a photograph light source control device for controlling the light volume emitted from the photograph light source based on the set-up exposure value information.

REFERENCES:
patent: 3944342 (1976-03-01), Martinez
patent: 4429970 (1984-02-01), Fujiwara

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