Method for making contact lenses
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United States of America Patent
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Apr 18, 2017
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app pub date -
Nov 8, 2011
filing date -
Nov 10, 2010
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Abstract
The instant invention pertains to a method and a fluid composition for producing contact lenses with improved lens quality and with increased product yield. The method of the invention involves adding a Butylated Polyvinylpyrrolidone into a fluid composition including a lens-forming material in an amount sufficient to reduce an averaged mold separation force by at least about 20% in comparison with that without the Butylated Polyvinylpyrrolidone.
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