Optics: eye examining – vision testing and correcting – Spectacles and eyeglasses – With antiglare or shading
Patent
1982-01-20
1984-06-05
Corbin, John K.
Optics: eye examining, vision testing and correcting
Spectacles and eyeglasses
With antiglare or shading
350448, G02C 716
Patent
active
044525168
ABSTRACT:
An optical grid for correcting optical defects in either natural or artificial lenses comprises two perpendicularly arranged series of dark and opaque bars integrally connected to each other in order to form an integral network, all of said bars having a triangular cross section with the base of the triangle facing said lens and the vertex away from said lens, so as to form square openings in said grid having their smaller areas facing said lens and their larger areas away from said lens, the ratio of said smaller areas to said larger areas being of from 1:36 to 1:2.25, preferably 1:4, said smaller area of each square opening being of from 0.04 to 4 mm.sup.2, preferably 1 mm.sup.2, and said bars being 1 mm wide.
In order to provide more luminosity, the grid is externally coated with a mirror-type reflecting coating or two large rectangular windows are provided laterally and away from the line of vision of said lens. In order to provide additional chromatic perception, a reflecting but matte coating is internally applied to the grid.
REFERENCES:
patent: 2232455 (1941-02-01), Hebrard
Bovernick Rodney B.
Corbin John K.
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