Patent ID: 6244707
Filing Date: 2001-06-12
Classification: G02B

Abstract:
A contact lens comprising a hydrogel polymer formed by polymerizing one or more monomers suitable for use in making such lenses, and copolymerizing effective amounts of a first ultraviolet absorber and a second ultraviolet absorber, wherein said first UV absorber is a benzotriazole compound represented by the formula: ##STR7##where R.sup.1a, R.sup.1b, and R.sup.1c are independently hydrogen, halogen, C.sub.1 -C.sub.6 straight or branched chain alkoxy group, aryl or substituted aryl; R.sup.2 is hydrogen or lower alkyl, aryl or substituted aryl; R.sup.3 is hydrogen, lower alkyl, aryl, substituted aryl, or R.sup.4 --R.sup.5 --R.sup.6, where R.sup.4 is an oxygen or is absent, R.sup.5 is a linking group selected from --(CH.sub.2).sub.n O--, --CH(CH.sub.3)CH.sub.2 O--, --CH.sub.2 CH(CH.sub.3)O--, --(CH.sub.2).sub.n OCH.sub.2 --, --CH(CH.sub.3)CH.sub.2 OCH.sub.2 --, or --CH.sub.2 CH(CH.sub.3)OCH.sub.2 -- group, or is absent; R.sup.6 is acrylate, methacrylate, styrene or vinyl; and n is 2 or 3;wherein the second UV absorber is a substituted 2-hydroxy-benzophenone according to the formula: ##STR8##where R.sup.7a, R.sup.7b, and R.sup.7c are independently hydrogen, halogen, C.sub.1 -C.sub.6 straight or branched chain alkoxy group, aryl or substituted aryl; R.sup.8 is a linking group selected from alkyl, --(CH.sub.2).sub.m O--, --CH(CH.sub.3)CH.sub.2 O--, --CH.sub.2 CH(CH.sub.3)O--, --(CH.sub.2).sub.m OCH.sub.2 --, --CH(CH.sub.3)CH.sub.2 OCH.sub.2 --, or --CH.sub.2 CH(CH.sub.3)OCH.sub.2 -- group, or is absent; and R.sup.9 is alkyl, acrylate, methacrylate, styrene or vinyl; and m is 2 or 3; andwherein the total amount of UV absorbers present is between about 0.8 and about 3.0 percent dry weight of the lens material, and the lens has an average UV transmittance of less than 10 percent in the UVA range and an average UV transmittance of less than 1.0 percent in the UVB range.