Preparation of photochromic gradient lenses of improved color

Details Preparation of photochromic gradient lenses of improved color Preparation of photochromic gradient lenses of improved color

1976-03-18

1978-02-28

Sacher, Paul A.

Optics: eye examining, vision testing and correcting

Spectacles and eyeglasses

Ophthalmic lenses or blanks

65DIG2, 106 47Q, 106 52, 106 54, 350357, G02C 710, G02B 523

Patent

active

040763951

ABSTRACT:
Glass lenses, or lens blanks, containing all the ingredients necessary to produce phototropic, or photochromic behavior, are treated in a conventional production furnace to produce a locally variable heat treatment, wherein at least one portion thereof is raised to a temperature exceeding the glass strain point but not the softening point, and other portions are heated to variable temperatures decreasing from the strain point. The treatment causes development of phototropic, or photochromic, behavior only in those portions of the lenses, or lens blanks, exposed to the temperature above the strain point. The lenses resulting are characterized by trichromatic coefficients, x=0.310 and y=0.321, in the unactivated state and x=0.314 and y=0.319, in an activated state.

REFERENCES:
patent: 2675740 (1954-04-01), Barkley
patent: 3197296 (1965-07-01), Eppler et al.
patent: 3208860 (1965-09-01), Armistead et al.
patent: 3255026 (1966-06-01), Stroud
patent: 3419370 (1968-12-01), Cramer et al.
patent: 3892582 (1975-07-01), Simms
patent: 3920463 (1975-11-01), Simms
patent: 3957499 (1976-05-01), DeMunn et al.
"Photogray Glass for Ophthalmic Lenses" Corning Tech. Bulletin July, 1970.

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