Variable density ophthalmic device

Details Variable density ophthalmic device Variable density ophthalmic device

1975-08-27

1978-10-10

Dixon, Harold A.

Optics: eye examining, vision testing and correcting

Spectacles and eyeglasses

With antiglare or shading

351 47, 351 57, G02C 712

Patent

active

041193695

ABSTRACT:
An ophthalmic device comprising superposed pairs of light polarizing elements, one pair of such elements being fixed and the other pair being rotatable with respect to the fixed pair to provide a variable light transmission feature. The fixed pair of elements is retained by a frame member having an arcuate peripheral portion which engages a rotatable light polarizing element biasing means which is fixedly attached to each rotatable light polarizing element and prevents substantial axial movement of the rotatable light polarizing element.

REFERENCES:
patent: 1614827 (1927-01-01), Coats
patent: 1661967 (1928-03-01), Savoie
patent: 2005426 (1935-06-01), Land
patent: 2206880 (1940-07-01), Cozzens
patent: 2251330 (1941-08-01), Fairbanks
patent: 2304504 (1942-12-01), Metzger
patent: 2380481 (1945-07-01), Tillyer

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