Process for producing a gradient photochromic ophthalmic lens

Details Process for producing a gradient photochromic ophthalmic lens Process for producing a gradient photochromic ophthalmic lens

1976-04-08

1980-07-22

Fisher, Richard V.

Glass manufacturing

Processes

With chemically reactive treatment of glass preform

65DIG2, C03B 3200, C03C 2300

Patent

active

042137721

ABSTRACT:
A photochromic ophthalmic lens exhibiting a gradient photochromic effect is produced in accordance with a heat treating process wherein the development of photochromic properties in a selected limited portion of the lens is suppressed by the action of vapor produced utilizing a porous refractory carrier material containing an evaporable liquid.

REFERENCES:
patent: 2825634 (1958-03-01), Rindone
patent: 2984943 (1961-05-01), White
patent: 3300670 (1967-01-01), Veres

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