Patent ID: 7709012

Claim:
An aqueous composition suitable for topical ophthalmic administration comprising a viscosity enhancing amount of combination of two polymers having a synergistic effect on the composition's viscosity and wherein the combination of two polymers is selected from the group consisting of hydroxypropyl methylcellulose and guar gum; a carboxyvinyl polymer and guar gum; hyaluronic acid and hydroxypropyl methylcellulose; and hyaluronic acid and guar gum, provided that if the composition comprises a carboxyvinyl polymer then the composition does not contain sodium chloride or boric acid; wherein the aqueous composition has a viscosity that is greater than 150% of a sum of viscosities of two solutions, each of the two solutions respectively including only one of the two polymers and wherein the total concentration of the two polymers in the composition ranges from 0.2-2.0% (w/w) and wherein the composition does not gel upon administration to the eye.