Method of cleaning contact lenses using carbon dioxide and carbonic acid
AssigneeAlcon Manufacturing, Ltd.
InventorsRajkumar Bhatia, Alok K. Kulshreshtha, Geoffrey R. Owen, Yusuf Ali
Life of this patent
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Abstract
Methods for cleaning soiled contact lenses are disclosed. The methods involve contacting the soiled lens with a cleaning composition comprising carbon dioxide and carbonic acid as cleansing agents. The cleaning compositions do not require abrasive agents such as polymeric beads, nor ocularly irritating agents such as enzymes or surfactants in order to effectively clean proteinaceous and nonproteinaceous deposits from the surface of contact lenses.
Claims1
A method of cleaning a soiled contact lens comprising contacting the soiled lens with an aqueous composition having a pH of less than about 7.5 comprising a cleansing amount of carbon dioxide and carbonic acid for a time sufficient to clean the soiled lens, wherein the composition is supplied from a container selected from the group consisting of (i) an aerosol container using carbon dioxide as a pressurizing gas and (ii) a polyethylene terephthalate container, and wherein the composition excludes polymeric beads, an enzyme, a cleansing amount of a surfactant, and a disinfecting amount of hydrogen peroxide.
Dependencies are inferred from the claim text.