Method of producing hydrogel contact lens involves diffusing silver with marking into lens.

摘要

The contact lens comprises a lens body possessing a porous matrix structure, and has a marking formed of silver compound immobilized in the matrix and or formed of pure silver. The silver in the matrix has at least a proportion of, halogenide, oxide and or is amorphous. The silver applied to the contact lens in the form of a marking is in the form of silver nitrate especially diffused into the contact lens and then precipitated as silver sulfide, with a sulfur-content compound, especially sodium sulfide/