Photochromic contact lenses and methods of manufacturing

Details Photochromic contact lenses and methods of manufacturing Photochromic contact lenses and methods of manufacturing

2008-05-06

2008-05-06

Johnson, Christina (Department: 1791)

Plastic and nonmetallic article shaping or treating: processes

Optical article shaping or treating

Composite or multiple layer

C264S001320, C264S001800, C264S001900

Reexamination Certificate

active

07368072

ABSTRACT:
Described are contact lenses having photochromic materials within the central or pupillary area of the lens and methods for manufacturing such lenses. In one method, a photochromic amount of at least one photochromic material is added to the pupillary region of a casting mold containing a polymerizable monomer that can be at least partially cured before and/or after the addition. Another method involves providing an amount of polymerizable photochromic monomer for the pupillary region and an amount of polymerizable non-photochromic monomer for the remainder of the contact lens in a casting mold. The photochromic and non-photochromic monomers can differ by their degree of polymerization, viscosity and/or density.

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