Optical viewing system

Details Optical viewing system Optical viewing system

1989-07-31

1990-05-29

Dzierzynski, P. M.

Optics: eye examining, vision testing and correcting

Spectacles and eyeglasses

Combined

351 57, 351 59, 350146, G02C 100, G02B 2500

Patent

active

049290754

ABSTRACT:
The invention relates to an optical, spectacle-type device for aiding the sight of persons who have serious vision deficiencies. The novel device makes it possible for such persons to focus at close-up, as well as at remote objects. The device comprises a spectacle frame (carrier-frame), provided with either neutral or optical lenses, in front of which (or attached to which) there is provided one or two telescopic lens-systems, there being provided a frame bearing a corrective lens or pair of lenses which can be moved so as to be in front of said telescopic lenses or removed from such position, said additional lenses changing the focal length of the entire system.

REFERENCES:
patent: 3865468 (1975-02-01), Holcomb
patent: 4540238 (1985-09-01), Edwards

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