Patent ID: 6623786
Filing Date: 2003-09-23
Classification: C08J,G02B

Abstract:
A method of treating the surface of an ophthalmic lens susceptible to unacceptable monomer or macromer penetration, comprising the steps of:(a) immersing said ophthalmic lens in a first homogeneous solution obtained by dissolving a water-insoluble photosensitizer in a mixture of water and at least one water-miscible solvent; (b) removing said ophthalmic lens from said first homogeneous solution; (c) evaporating at least a portion of said solvent from said ophthalmic lens; (d) placing said ophthalmic lens in a second solution containing at least one hydrophilic macromer having a number-average molecular weight of at least 500; and (e) applying radiation to said ophthalmic lens for a period sufficient to cause at least a portion of said macromer to bond to the surface of said ophthalmic lens, wherein the concentration of said at least one water-miscible solvent is present in said mixture in an amount sufficiently high enough to dissolve said photosensitizer to provide the homogeneous solution, but sufficiently low enough to induce at most an insignificant swelling in and/or on said ophthalmic lens, wherein the insignificant solvent-induced swelling is characterized by that no substantial amount of said macromer penetrates the swelled ophthalmic lens to cause intolerable amounts of deviation in shape or optical properties of said ophthalmic lens.