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US 6,348,507 B1Granted
Surface treatment of silicone hydrogel contact lenses
AssigneeBausch & Lomb Incorporated
InventorsDavid J. Heiler, Suzanne F. Groemminger, John Denick, Jr., Lisa C. Simpson
Life of this patent
Estimating the term…
Abstract
The present invention provides an optically clear, hydrophilic coating upon the surface of a silicone hydrogel lens by plasma treating the lens and subsequently heating the lens in an aqueous solution containing a surface-protective agent.
Claims4
A sterile ophthalmically safe aqueous composition for packaging contact lenses having a pH of about 5.0 to 8.0 comprising:
- (a) from about 0.03 to 3.0 percent by weight of a surface-protective agent selected from the group consisting of a silicate salt, silicic acid, colloidal silica, and combinations thereof,
- (b) an effective amount of at least one osmolality adjusting agent such that the composition has substantially the same osmolality as tear fluid such that said composition may be placed directly in the eye without rinsing.
Dependencies are inferred from the claim text.