| 摘要 |
PROBLEM TO BE SOLVED: To provide a contact lens having a photochromic material within the central or pupillary area of the lens. SOLUTION: The contact lens having the photochromic material within the central or pupillary area of the lens and methods for manufacturing such a lens are described. In one method, a photochromic amount of at least one photochromic material is added to the pupillary region 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 an amount of polymerizable photochromic monomer for the pupillary region and an 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 by their degree of polymerization, viscosity and/or density. COPYRIGHT: (C)2009,JPO&INPIT |
