Method for treating extended-wear contact lenses in the eyes
AssigneeBausch & Lomb Incorporated
InventorsZhenze Hu, Christine E. Soltys
Life of this patent
Estimating the term…
Abstract
The present invention is directed to a method for treating a silicone-hydrogel contact lenses while worn in the eye. In particular, the method employs an ophthalmic solution containing a cationic cellulosic polymer that binds to the lens and prevents the accumulation of lipids, proteins and other products, particularly during extended use of the lens. The addition of one or more surfactants to the solution further maintains the lens clean during use. Such a solution is intended to be applied, in the form of drops, to contact lens in the eye.
Claims13
A method of treating a silicone-hydrogel contact lens that is an extended-wear lens wom for an extended-wear period within the range of about 7 days to about 30 days to provide resistance to lipid deposition which method comprises treating the lens in the eye with eye drops of a sterile aqueous solution comprising:
- (a) 0.01 to 1.0 percent by weight of a cationic cellulosic polymer;
- (b) at least one tonicity agent which is present in an amount of 0.01 to 10.0% by weight;
- and
- (c) an effective amount of a buffering agent to maintain the pH from about 6 to about 8.
A method of treating a silicone-hydrogel contact lens that is an extended-wear lens worn for an extended-wear period within the range of about 7 days to about 30 days to provide resistance to lipid deposition which method comprises treating the lens in the eye with eye drops of a sterile aqueous solution comprising:
- (a) 0.01 to 1.0 percent by weight of a cationic cellulosic polymer;
- (b) 0.1 to 2.0 percent by weight of at least one surfactant, including a polyoxyethylene-polyoxypropylene nonionic surfactant;
- (c) an effective amount of a polymeric nonionic demulcent;
- (d) at least one tonicity agent which is present in an amount of 0.01 to 10.0% by weight;
- and
- (e) an effective amount of a buffering agent to maintain the pH from about 6 to about 8.
Dependencies are inferred from the claim text.