Method and apparatus for the projection of optical test objects

Details Method and apparatus for the projection of optical test objects Method and apparatus for the projection of optical test objects

1979-03-30

1981-06-23

Corbin, John K.

Optics: eye examining, vision testing and correcting

Spectacles and eyeglasses

Folding

351 13, A61B 302, A61B 310

Patent

active

042747155

ABSTRACT:
Method and apparatus for projecting or imaging optotypes so that they can be perceived in space under conditions of unimpeded vision without requiring, e.g., projection screens.

REFERENCES:
patent: 2212597 (1940-08-01), Hadda et al.
patent: 3524702 (1970-08-01), Bellows et al.
patent: 3572910 (1971-03-01), Koester
patent: 3737217 (1973-06-01), Haines et al.

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