Patent ID: 8618187

Claim:
A process for manufacturing a contact lens, comprising the steps of: (1) providing a mold assembly comprising at least a first and a second mold half, wherein the mold assembly further comprises a mask providing for a spatial limitation of the actinic radiation defining the edge of the contact lens; (2) dosing a lens forming material into the first mold half, wherein the lens forming material comprises (a) from about 5% to about 60% by weight of a hydrophilic amide-type vinylic monomer, (b) from about 5% to about 50% by weight of a siloxane-containing acrylamide vinylic monomer, (c) from about 5% to about 50% by weight of a polysiloxane-containing vinylic monomer or macromere comprising at least one methacrylate group, and (d) from 0.05% to 4% by weight of methylene bisacrylamide; (3) closing the first and second mold halves to form a mold cavity defining at least the first and second surfaces of a contact lens; (4) curing, under a spatial limitation of the actinic radiation, the lens forming material in the mold cavity; and (5) opening the first and a second mold halves; and removing the contact lens from the first or second mold half.