Process for making multifocal photochromic ophthalmic lens

Details Process for making multifocal photochromic ophthalmic lens Process for making multifocal photochromic ophthalmic lens

C - Chemistry, Metallurgy

03

B

49/82.1

C03B 23/20 (2006.01) C03B 23/22 (2006.01) C03B 32/00 (2006.01) C03C 4/06 (2006.01) G02C 7/06 (2006.01)

Patent

CA 1050273

PROCESS FOR MAKING MULTIFOCAL PHOTOCHROMIC OPHTHALMIC LENS Abstract of the Disclosure Multifocal photochromic ophthalmic lenses are produced by nucleating potentially photochromic major lens blanks through heat treatment, combining the nucleated blanks with compatible button or segment glasses, and fusing the combined glasses at temperatures suitable for achieving both fusion and the simultaneous development of full photochromic prop- erties in the previously nucleated major lens blanks.

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