| abstract |
An intraocular lens made from a class of optically clear, ultraviolet (UV) light absorbing, vulcanized silicone compositions containing about 35 mole % or greater phenyl groups (C6H5), suitable for implanting in the human eye is disclosed. The high mole percentage of phenyl groups in the vulcanized silicone compositions provides a high refractive index (at least about 1.50) and partially blocks ultraviolet light absorption. The composition is formed by the vulcanization of a mixture which comprises, for example, the following polyorganovinylsiloxane components: Component (I): α,φ- bis(trivinylsiloxy)oligodimethyldiphenylvinylmethylsiloxane; Component (II): α,φ-bis(trimethylsiloxy) oligodimethyldiphenylmethylhydrosiloxane; and Component (III): α,φ-bis(trimethylsiloxy)oligomethylphenylvinylmethylphenylsiloxane; together with Component (IV) a polyaddition reaction catalyst, particularly a complex platinum catalyst (for example, the complex of platinum and hexavinyldisiloxane); wherein the ratio, by weight, of the mixture in the four components (I:II:III:IV respectively) in the pre-vulcanized mixture is from about 0.9:0.1:0.015:0.006 to about 0.7:0.3:0.05:0.01. |