Fundus camera photographic optical system

Details Fundus camera photographic optical system Fundus camera photographic optical system

1992-04-14

1993-08-17

Gellner, Michael L.

Optics: eye examining, vision testing and correcting

Spectacles and eyeglasses

Ophthalmic lenses or blanks

351206, G03B 2900

Patent

active

052373568

ABSTRACT:
This invention provides a photographic optical system for a fundus camera comprising an objective lens, a photographic diaphragm, a focusing lens, a field diaphragm and a relay lens adjacent to the subject's eye. In this system, the focusing lens has a positive power, and consequently a large aperture imaging lens can be avoided and the system made compact without adversely affecting optical performance.

REFERENCES:
patent: 4666268 (1987-05-01), Ito

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