Wide angle fundus illumination and photography apparatus

Details Wide angle fundus illumination and photography apparatus Wide angle fundus illumination and photography apparatus

1974-03-29

1977-05-10

Hayes, Monroe H.

Optics: eye examining, vision testing and correcting

Spectacles and eyeglasses

Ophthalmic lenses or blanks

350183, 351 6, 351 7, G03B 2900

Patent

active

040231895

ABSTRACT:
A wide angle instrument for illuminating, observing and photographing the fundus of the eye is provided. The instrument has a focus tube containing spaced decollimating and objective lenses with an adjustable aperture diaphragm positioned therebetween, which tube projects a glare-reducing entrance pupil on the eye examined and maintains the position and size thereof while the instrument is being focused by moving the focus tube relative to the eye examined to focus on the fundus.

REFERENCES:
patent: 3016000 (1962-01-01), Noyori
patent: 3259039 (1966-07-01), Okajima
patent: 3437398 (1969-04-01), Muller
patent: 3770342 (1973-11-01), Dudragne
patent: 3780979 (1973-12-01), Guillebon

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