Process for making silicone containing hydrogel lenses
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United States of America Patent
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Nov 9, 1993
Grant Date -
N/A
app pub date -
Aug 3, 1992
filing date -
Aug 3, 1992
priority date (Note) -
In Force
status (Latency Note)
Importance
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.
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