Selective optical filter

Details Selective optical filter Selective optical filter

1978-05-08

1980-10-21

Corbin, John K.

Optics: eye examining, vision testing and correcting

Spectacles and eyeglasses

With antiglare or shading

351 45, G02C 710

Patent

active

042290821

ABSTRACT:
A selective optical filter, intended to be placed before the eyes for protection and for improvement of vision, features a plurality of different light absorption zones comprising a central zone which is completely light permeable, or has low light absorption capability, a zone surrounding this central zone which is light permeable but has a relatively high light absorption capability, the said zone being included between the periphery of the central zone and a cone having its apex at the optical center of the eye and an included angle of between about 15.degree. and 30.degree., and the outer periphery of the zone adjoining a further zone of low light absorption capability corresponding to the peripheral part of the retina.

REFERENCES:
patent: 560418 (1896-05-01), Lorenz
patent: 1180341 (1916-04-01), Thomas
patent: 1865691 (1932-07-01), Hill
patent: 1957071 (1934-05-01), Marchner
patent: 3592525 (1971-07-01), Schulty

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