Alcon Inc.
Method for making silicone hydrogel contact lenses
Last updated:
Abstract:
The invention provides a method for making silicone hydrogel contact lenses. The method of the invention is characterized by using an organic solvent as a processing-aid tool for controlling lens diameter without significantly affecting lens equilibrium water content during cast-molding of soft contact lenses from a polymerizable composition. By adjusting the weight percentage of the organic solvent in a polymerizable composition for making SiHy contact lenses, one can adjust lens diameter of produced SiHy lenses to meet target without affecting adversely the lens properties.
Status:
Grant
Type:
Utility
Filling date:
27 Mar 2019
Issue date:
30 Aug 2022