Patent ID: 7419944
Filing Date: 2008-09-02
Classification: A01N,Y10S

Abstract:
1. An aqueous solution for disinfecting a contact lens, comprising: from 0.1 to 10 ppm of a microbicide selected from the group consisting of polyhexamethylene biguanide and alexidine; and 0.001 to 0.2 mol/L of 1,3-bis(tris[hydroxylmethyl]methylamino)propane or a salt thereof as buffering agent, wherein the aqueous solution buffered by 1,3-bis(tris[hydroxylmethyl]methylamino)propane is characterized by having a disinfecting efficacy that is at least 1.0 log of reduction greater than a disinfecting solution containing the same amount of the microbiocide but buffered with a phosphate buffer, wherein said solution has a pH of 6.8 to 7.5.