PHOTOCHROMIC CONTACT LENS AND MANUFACTURING METHOD THEREOF

摘要

PROBLEM TO BE SOLVED: To provide a contact lens which has a photochromic material within a central or pupillary area of the lens.SOLUTION: Described are contact lenses having a photochromic material within the central or pupillary area of the lens and a method for manufacturing such lenses. In one method, a photochromic amount of at least one photochromic material is added to the pupillary area of a casting mold containing a polymerizable monomer that can be at least partially cured before and/or after the addition. Another method involves providing a certain amount of polymerizable photochromic monomer for the pupillary area and a certain amount of polymerizable non-photochromic monomer for the remainder of the contact lens in a casting mold. The photochromic and non-photochromic monomers can differ in their degree of polymerization, viscosity and/or density.