Retinal camera

Details Retinal camera Retinal camera

1986-08-06

1989-03-07

Bovernick, Rodney B.

Optics: eye examining, vision testing and correcting

Eye examining or testing instrument

Objective type

351213, A61B 314

Patent

active

048100846

ABSTRACT:
A retinal camera of the present invention has an illumination optical system for projecting an illumination light to a retina of an eye to be tested and a photographing optical system for photographing a retinal image of the eye to be tested. The illumination optical system is provided in a position substantially conjugate to the retina with a filter member. The filter member is formed as such that transmittance is relatively increased as it goes toward the peripheral portion from the central portion. When the retina of the eye to be tested is illuminated by this illumination optical system, an illumination light quantity per unit area at the peripheral portion side becomes larger than a illumination light quantity per unit area of the central portion side of an illumination light to be formed on the retina. When the retina of the eye to be tested is photographed by such illumination light as mentioned, the retinal image taken is generally uniform in brightness of the central portion and that of the peripheral portion. That is, it can be prevented that the central portion of the retinal image is taken excessive in brightness at the central portion and excessive in darkness at the peripheral portion.

REFERENCES:
patent: 4265518 (1985-05-01), Matsumura
patent: 4439024 (1984-03-01), Ito

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