Fundus camera

Details Fundus camera Fundus camera

1981-01-29

1983-12-27

Evans, F. L.

Optics: eye examining, vision testing and correcting

Eye examining or testing instrument

Objective type

354 62, A61B 314

Patent

active

044227353

ABSTRACT:
A fundus camera includes an objective lens which is movable in a plane perpendicular to the principal optical axis thereof. The camera also includes an optical system comprising four reflecting surfaces which move as the objective lens is moved to compensate for an optical path length, the arrangement being such that a visual axis of an eye being examined can be brought into alignment with the principal optical axis of the objective lens without changing the length of the observation and photographing light path, by means of a movement of only part of the optical system and without moving the entire main body.

REFERENCES:
patent: 4279507 (1981-07-01), Bulpitt

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