Process for making silicone containing hydrogel lenses
AssigneeBausch & Lomb Incorporated
InventorsMahendra P. Nandu, Rajan S. Bawa, Yu-Chin Lai
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Abstract
A process for preparing silicone hydrogel contact lenses where machining operations are employed to produce a lens having a desired final shape. The silicone hydrogel contact lenses are prepared by: providing a monomeric mixture comprising a silicone-containing monomer, a hydrophilic monomer and an organic diluent; charging the mixture to a mold and curing the formulation in the mold to obtain a shaped article; removing organic diluent from the shaped article to improve machineability of the article; and machining the shaped article to obtain a contact lens having a desired configuration.
Claims20
A process for preparing silicone hydrogel contact lenses, said process comprising:
- (a) providing a monomeric mixture comprising a silicone-containing monomer, a hydrophilic monomer and an organic diluent;
- (b) charging the monomeric mixture to a mold and curing the formulation in the mold to obtain a shaped article;
- (c) removing diluent from the shaped article to improve machineability of the shaped article;
- and
- (d) machining the shaped article to obtain a contact lens having a desired configuration.
Dependencies are inferred from the claim text.