Is a
Patent attributes
Patent Jurisdiction
Patent Number
Patent Inventor Names
Frank P. Mallak0
Anil Kumar0
Barry Van Gemert0
Robert W. Walters0
Date of Patent
May 6, 2008
0Patent Application Number
103156560
Date Filed
December 10, 2002
0Patent Citations Received
Patent Primary Examiner
Patent 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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