Method for cleaning a contact lens
AssigneeTomei Sangyo Kabushiki Kaisha
InventorAkira Nakagawa
Life of this patent
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Abstract
A method for cleaning a contact lens, which comprises diluting an enzyme-containing aqueous solution containing an effective amount of serine protease and from 30 to 95% by weight of glycerol with a diluting solution containing from 0.05 to 5% by weight of an anionic surfactant having no polyoxyethylene glycol unit and from 0.005 to 0.1% by weight of ethylenediamine tetraacetate to a glycerol concentration of not higher than 5% by weight, to obtain a treating solution, and immersing a contact lens in the treating solution.
Claims9
A method for cleaning a contact lens, which comprises immersing said contact lens under conditions suitable for and for a time sufficient to clean protein deposits from said lens in a treating solution comprising:
- (A) an enzyme-containing aqueous solution comprising
- (i) a serine protease and
- (ii) from 30 and 95% by weight of glycerol as suitable to stabilize the enzyme during solution storage;
- and
- (B) a diluting solution comprising
- (i) from 0.05-5% by weight of an anionic surfactant having no polyoxyethylene glycol units and
- (ii) from 0.005-0.1% by weight of ethylenediamine tetraacetate;
- wherein the proportion of (A) to (B) in said treating solution is such that the glycerol concentration is not higher than 5% by weight and the concentration of serine protease is in an amount effective to clean a contact lens.
Dependencies are inferred from the claim text.