摘要:
An improved process for spincasting contact lenses with differently shaped concave lens surfaces from the same mold design comprises providing molds with uniformly shaped concave surfaces, and spincasting in the molds a series of polymerizable mixtures. Contact lenses with differently shaped concave lens surfaces are obtained by varying the ratio of the monomers and an organic diluent in the polymerizable mixtures.
摘要:
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; andmachining the shaped article to obtain a contact lens having a desired configuration.