G - Physics – 02 – C
Patent
G - Physics
02
C
31/71
G02C 13/00 (2006.01) A61L 12/08 (2006.01) A61L 12/14 (2006.01) C11D 3/00 (2006.01) C11D 7/16 (2006.01) C11D 7/26 (2006.01)
Patent
CA 1136841
METHOD AND COMPOSITION FOR TREATING CONTACT LENSES ABSTRACT The invention relates generally to a method and composition for the treatment of contactlenses to remove inor- ganic deposits and to prevent the formatin of inorganic deposits on the lenses. One of the problems connected with these types of lenses is the formation, over a period of time, of insoluble inorganic deposits on the lenses. These deposits are thought to be primarily calcium based, e.g., calcium phosphate and calcium cabonate, but may also contain other inorganic materials and associated organic materials, e.g., protein. The presence of these insoluble inorganic deposits is a common cause of lens intolerance and decreased visual acuity. The present invention provides a method and compo- sition for the treament of contct lenses, and especially silicone and hydrophilic plastic contact lenses, to remove inorganic deposits and to prevent the formation of inorganic deposits on the lenses. The method comprises contacting a contact lens with an acqueous solution containing an effective amount of a sequestering agent selected from the group consisting of a poly- metaphospate, gluconic acid and salts thereof for a period, of time sufficient to remove existing inorganic deposits and to prevent formation of inorganic deposits.
343588
Allergan Pharmaceuticals Inc.
Gowling Lafleur Henderson Llp
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