Abstract: An interpenetrating polymer network (IPN) composition and a process for the manufacture of hydrogel contact lens using the invention material. The polymeric materials are formed by polymerization of: (1) an unsaturated alkyl(meth)acrylate or its derivatives such as 2-hydroxyethyl methacrylate as the principle monomer; (2) optionally vinyl containing comonomer(s) to enhance the resulting hydrogel water absorbing capability; (3) polymerizable multi-functional crosslinking agent(s); (4) an irradiation initiator and/or thermal initiator; (5) optionally other additives to impart the resulting hydrogel specific properties such as ultra-violet blocking ability and handling colors; in the presence of a soluble, hydrophilic IPN agent such as polyvinylpyrrolidone (PVP) or poly-2-ethyl-2-oxazoline (PEOX) with a specific molecular weight range.

Abstract: An interpenetrating polymer network (IPN) composition and a process for the manufacture of hydrogel contact lens using the invention material. The polymeric materials are formed by polymerization of: (1) an unsaturated alkyl(meth)acrylate or its derivatives such as 2-hydroxyethyl methacrylate as the principle monomer; (2) optionally vinyl containing comonomer(s) to enhance the resulting hydrogel water absorbing capability; (3) polymerizable multi-functional crosslinking agent(s); (4) an irradiation initiator and/or thermal initiator; (5) optionally other additives to impart the resulting hydrogel specific properties such as ultra-violet blocking ability and handling colors; in the presence of a soluble, hydrophilic IPN agent such as polyvinylpyrrolidone (PVP) or poly-2-ethyl-2-oxazoline (PEOX) with a specific molecular weight range.

Abstract: The invention is a method of printing a replica of the natural iris on a contact lens. The printing is done using a rubber printing member having up raised rubber radial segments having a radius of substantially the same as the contact lens. The printing ink is applied to the radial printing segments and the rubber stamp is applied to the lens. Pressure is then applied to the rubber stamp forcing the edges of the radial printing segments to move outward moving an amount of printing ink ahead of the advancing edge. The lens is rotated and the process is repeated forming a geometric pattern resembling the human iris.

Abstract: The invention relates to a method of spin casting lenses having optical surfaces which may be spherical, aspherical or toric in shape. The method provides a concave optical mold having a spherical, aspherical or toric optical surface. A convex optical mold having a spherical, aspherical or toric surface is also privided. A selected liquid lens monomer with a selected catalyst is placed in the concave lens mold. The convex optical mold is positioned in the concave mold displacing the liquid lens monomer. The optical axis of the concave and convex molds are aligned and the two molds rotated about their concurrent optical axis. The liquid monomer is allowed to polymerize forming a solid polymer lens. The finished lens is then removed from the molds.