Patent ID: 8939577
Filing Date: 2015-01-27
Classification: B29D,C08G,C08J,C08L,C09D,G02B,G02C

Abstract:
1. A silicone hydrogel contact lens having a layered structural configuration and a water content gradient from inside to outside of the silicone hydrogel contact lens, comprising: a silicone hydrogel core (or bulk material) completely covered with an outer (surface) hydrogel layer having a thickness of at least about 0.1 μm as measured with atomic force microscopy across a cross section from the posterior surface to the anterior surface of the silicone hydrogel contact lens in fully hydrated state, wherein the outer hydrogel layer is substantially free of silicone, and wherein the water content of the outer hydrogel layer is at least about 1.2 folds (or about 120%) of the water content (designated as WC SiHy ) of the silicone hydrogel bulk material when being fully hydrated.