Preparation of photochromic gradient lenses

Details Preparation of photochromic gradient lenses Preparation of photochromic gradient lenses

C - Chemistry, Metallurgy

03

B

49/77

C03B 32/00 (2006.01) A61F 2/16 (2006.01) C03C 4/06 (2006.01) G02C 7/10 (2006.01)

Patent

CA 1091024

Abstract of the Disclosure Glass lenses or lens blanks, containing all the ingre- dients 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 there- of is raised to a temperature exceeding the glass strain point but not the softening point, and other portions are heated to variable temperature decreasing from the strain point. The treatment causes development of phototropic or photochromic be- havior only in those portions of the lenses or lens blanks ex- posed to the temperature above the strain point.

270390

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