DISINFECTING CONTACT LENSES USING SULPHUR DIOXIDE AND/OR BENZOIC ACID

摘要

A contact lens is disinfected with an aqueous solution containing sulphur dioxide and/or benzoic acid, optionally under acidic conditions, for a period of time sufficient to disinfect the lens. The sulphur dioxide may be released from a metabisulphite or dithionite. The pH of the solution may be adjusted to the range 6 to 8 so that when the disinfected lens is removed from the solution and replaced in the eye, it is substantially non-irritant to the eye. The pH adjustment is preferable carried out employing the delayed release of a material which has an alkaline reaction with water whereby all the components of the system may be present at the beginning of the disinfection cycle. Compositions and packs for use in the disinfection are also described.