Methods for preparing composite photochromic ophthalmic lenses

Details Methods for preparing composite photochromic ophthalmic lenses Methods for preparing composite photochromic ophthalmic lenses

2005-03-08

2005-03-08

Vargot, Mathieu D. (Department: 1732)

Plastic and nonmetallic article shaping or treating: processes

Optical article shaping or treating

Utilizing plasma, electric, electromagnetic, particulate, or...

C264S001700, C425S808000, C425S812000

Reexamination Certificate

active

06863848

ABSTRACT:
A method of manufacturing a composite photochromic ophthalmic lens having an index of refraction of at least 1.49 is disclosed. The method comprises providing against a front portion of a mold, a first ophthalmic lens-forming composition including a polymerizable monomer, oligomer, or polymer and a photochromic compound; filling a rear portion of the mold with a second ophthalmic lens-forming composition, sufficiently different from the first ophthalmic lens-forming composition such that a distinct phase boundary results between the two compositions after complete curing of the two compositions, the second ophthalmic lens-forming composition including a polymerizable monomer, oligomer or polymer that is different from the monomer, oligomer or polymer of the first ophthalmic lens-forming composition, such that the second ophthalmic lens-forming composition is in contact with the first lens-forming composition, wherein either the first or second ophthalmic lens-forming composition is gelled before adding the other ophthalmic lens-forming composition, in an ungelled state, to the mold; and curing the first and second ophthalmic lens-forming compositions simultaneously, while the first and second ophthalmic lens-forming compositions are in intimate contact.

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