Ophthalmic examination chart projector

Details Ophthalmic examination chart projector Ophthalmic examination chart projector

1977-01-25

1978-06-13

Sacher, Paul A.

Optics: eye examining, vision testing and correcting

Spectacles and eyeglasses

Folding

351 34, A61B 302

Patent

active

040945928

ABSTRACT:
Ophthalmic examination chart projector including a rotatable chart carrying disc and a mask plate which are co-axial with each other. A light source and a projecting lens assembly are provided for projecting one of the charts on the disc and one of the mask openings onto a screen. An index tube is rotatably mounted in the projecting optical path and carrying a colored filter on the inner periphery thereof. Thus, an astigmatic index can be projected on the peripheral portion of the astigmatic examination chart. The chart carrying disc, the mask plate and the astigmatic index tube can be controlled by knobs all provided on the front panel of the projector.

REFERENCES:
patent: 2570652 (1951-10-01), Dilks
patent: 3655276 (1972-04-01), Wilkinson
patent: 3711195 (1973-01-01), Gehlert

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