Patent ID: 6126706
Filing Date: 2000-10-03
Classification: A61L,C11D

Abstract:
A method of cleaning and disinfecting a contact lens, comprising the steps of:preparing a disinfectant which is an aqueous solution containing polyvinylpyrrolidone-iodine, and a diluent which is an aqueous solution containing ethylenediamine tetraacetic acid and/or soluble salts thereof, and a nonionic surface active agent selected from the group consisting of polyoxyethylene castor oil, polyoxyethylene hardened or hydrogenated castor oil, polyoxyethylene sorbitan fatty acid ester, polyoxyethylene alkyl ether, polyoxyethylene stearate, polyoxyethylene-polyoxypropylene block copolymer and mixtures thereof;immersing said contact lens in said diluent; andmixing said disinfectant and said diluent in which said contact lens is immersed, such that an available iodine concentration of a mixed solution of said diluent and said disinfectant immediately after mixing is in a range of 0.01-50 ppm, and such that concentrations of said ethylenediamine tetraacetic acid and/or said soluble salts thereof, and said nonionic surface active agent in said mixed solution are in a range of 0.0001-1.0 w/v % and in a range of 0.01-1.0 w/v %, respectively, said nonionic surface active agent lowering a rate of reduction of said available iodine in said mixed solution, so that said available iodine which remains in said mixed solution is gradually reduced by said ethylenediamine tetraacetic acid and/or said soluble salts thereof.