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US 12,638,613 B2Granted
Ophthalmic lenses and their manufacture by in-mold modification
AssigneeJohnson & Johnson Vision Care, Inc.
InventorsMichael F. Widman, Ghulam Maharvi, Shivkumar Mahadevan, Azaam Alli, Alexander Guzman, Xin Wei, Minghan Chen
Life of this patent
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Abstract
Provided is a method for forming an ophthalmic lens as well as a lens formed by such method. The method includes the curing of a reactive monomer mixture within a mold assembly under conditions to permit incorporation of functional features into selective portions of the ophthalmic lens.
Claims22
A method for forming an ophthalmic lens, the method comprising:
- (a) providing a mold assembly comprised of a base curve and a front curve, the base curve and the front curve defining and enclosing a cavity therebetween, the cavity containing a reactive monomer mixture, wherein the reactive monomer mixture comprises a monomer suitable for making the ophthalmic lens, a first polymerization initiator that is capable of being activated at a first wavelength, a first functional moiety chemically linked to the first polymerization initiator, and a second polymerization initiator that is capable of being activated by a second activation that does not substantially activate the first polymerization initiator, wherein at least one of the base curve or front curve is light transmissive;
- (b) exposing one or more selective regions of the reactive monomer mixture to a source of actinic radiation at the first wavelength to thereby selectively polymerize a portion of the reactive monomer mixture, wherein the source of actinic radiation includes a plurality of selectively controllable beams of actinic radiation and the exposure is conducted according to a predetermined script to cause selective polymerization of the reactive monomer mixture in a predetermined pattern within the cavity of the mold assembly, and wherein the selectively polymerized portion incorporates the first functional moiety;
- (c) exposing the reactive monomer mixture to the second activation to activate the second polymerization initiator and cure the reactive monomer mixture;
- (d) removing the ophthalmic lens from the mold assembly;
- and
- (e) extracting unreacted first polymerization initiator from the ophthalmic lens.
3 more elements
Dependencies are inferred from the claim text.