Patent ID: 6171404
Filing Date: 2001-01-09
Classification: C11D

Abstract:
A method of cleaning a soiled contact lens comprising the steps of dissolving an effervescent tablet composition capable of generating a cleansing amount of carbon dioxide and carbonic acid in an aqueous composition having a pH of less than about 7.5 to form a cleaning solution, and contacting the soiled lens with the cleaning solution for a time sufficient to clean the soiled lens, wherein the effervescent tablet composition excludes polymeric beads, an enzyme, a cleansing amount of a surfactant, and a disinfecting amount of hydrogen peroxide, and further provided that the effervescent tablet is a layered tablet comprising a first layer containing a compound selected from the group consisting of alkali carbonate compounds but lacking an acidic compound and a second layer containing a compound selected from the group consisting of organic and inorganic acidic compounds but lacking an alkali carbonate compound.