Optics: eye examining – vision testing and correcting – Spectacles and eyeglasses – Ophthalmic lenses or blanks
Patent
1982-03-03
1985-10-29
Corbin, John K.
Optics: eye examining, vision testing and correcting
Spectacles and eyeglasses
Ophthalmic lenses or blanks
65 3011, 350354, 350370, 351165, C03C 326, G02B 530, G02B 2728, G02C 710
Patent
active
045497958
ABSTRACT:
Polarized ophthalmic glass lenses are made from conventional ophthalmic glass. This is accomplished by heating a sheet of ophthalmic glass, which includes a reducible metal oxide as part of its composition, to its softening point in a reducing atmosphere for a time interval sufficient to reduce the metal oxide to metal to a predetermined depth on at least one surface of the sheet. Following this reduction of the metal oxide, the sheet is held at an elevated temperature to permit the reduced oxides to nucleate. Then, the sheet is stretched in one direction to elongate the nucleated metal particles in parallel lines. The glass then is shaped, cut into lenses, permitted to cool, and the outer surface of the lens blanks are ground and polished in a conventional manner, leaving the stretched elongated metal particles on the inner surface thereof to create polarized ophthalmic lenses.
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Corbin John K.
Ptak LaValle D.
Sugarman Scott J.
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