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US 4,792,414 AGranted
Cleaning agent for optical surfaces
AssigneeAlcon Laboratories, Inc.
InventorsKai C. Su, Leslie F. Stebbins, Rajkumar P. Bhatia
Life of this patent
Estimating the term…
Abstract
Soft and hard contact lenses are freed from deposits by rubbing them with a particulate organic polymer with a carrier, the polymer having a particular size in the range from about one micron to about 600 microns and a Rockwell hardness in the range of from about R30 to about M105, or a shore hardness in the range from about A15 to about D100.
Claims11
A sterile, ophthalmic composition for cleaning a contact lens comprising:
- an effective amount of a particulate polymer for removal of proteinaceous and lipid deposits on said contact lens, the particulate polymer selected from the group consisting of organic polymers, polysiloxane polymers, and mixtures thereof, the particulate polymer comprising particles which have a particle size in the range of from about one micron to about six hundred microns, the particulate polymer having a Rockwell hardness in the range of from about R30 to about M105, or a Shore hardness in the range of from about A15 to about D100;
- and a carrier in which said particulate polymer is suspended, said carrier being compatible with ocular tissue and having a viscosity sufficient to keep the particulate polymer in suspension to provide a sterile, ophthalmic composition.
Dependencies are inferred from the claim text.