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US 4,702,574 AGranted
Contact lenses having fluorescent colorants and apparatus for making such lenses
AssigneeBausch & Lomb Incorporated
InventorRajan Bawa
Life of this patent
Estimating the term…
Abstract
Cosmetic contact lenses, which are tinted with daylight fluorescent pigments in the iris area, can change the wearer's apparent iris color to any desired color, including changing a dark iris to a lighter color such as blue or green.
Claims11
A contact lens comprising an optical zone, at least a portion of the optical zone being colored by a fluorescent colorant compound which fluoresces visibly in daylight.
Apparatus for making contact lenses which comprises
- a rotatable contact lens mold having a concave upper surface adapted to receive a monomer composition for polymerization
- and, positioned above the mold, an opaque mask in the form of an inverted, truncated, hollow cone or pyramid, the truncated lower end of the mask defining an aperture for irradiation of a circular central area of the surface of the mold and the wall of said mask having at least one horizontal slot defining an aperture for irradiation of a peripheral annular area of the surface of the mold.
Dependencies are inferred from the claim text.