Patent ID: 6143244
Filing Date: 2000-11-07
Classification: A61L,C11D,Y10S

Abstract:
A method of disinfecting or cleaning and disinfecting a soft contact lens with a multi-purpose solution or effective multipurpose solution, which method comprises the steps of:(a) treating the lens by soaking said lens in an ophthalmically safe solution, such that acceptable disinfection of the contact lens is obtained within a minimum recommended soaking period, the solution having a pH of 5 to 8 and comprising, in formulation, the following components:(i) a germicidally effective amount of at least one biguanide germicide, and(ii) a buffering system comprising 0.004 M to 0.2 M of a first buffer component selected from the group consisting of phosphoric acid, salts thereof, and mixtures thereof, in combination with 0.02 M to 0.8 M of a second buffer component selected from the group consisting of boric acid, salts thereof; and mixtures thereof, such that the combination of the first and second buffer component provides a buffering capacity of 0.01 to 0.5 mM of 0.01 N of HCl or 0.01 to 0.3 mM of 0.01 N of NaOH to change one liter of solution one pH unit,(iii) an effective cleaning amount of a non-ionic surfactant; and(b) directly placing the treated lens on an eye of a wearer, such that (i) rinsing with a different solution prior to placement on the eye is not required, and (ii) no other solution is required for daily cleaning of the lens.