Improved hydrogel contact lenses.

摘要

A hydrogel contact lens is disclosed which is formed from a hydrated lightly cross-linked copolymer of a monomer mixture comprising N-vinyl pyrrolidone (NVP) and a short chain alkyl acrylate or methacrylate in the weight ratio of from about 1.75:1 to 2.25:1, a short chain unsaturated carboxylic acid and a cross-linking monomer, the monomer mixture containing a majority of NVP and alkyl acrylate or methacrylate and having been polymerised using a chemical free radical initiator. The lens produced in accordance with the invention have high water content coupled with good mechanical properties.