Pupil-only photochromic contact lenses displaying desirable optics and comfort
AssigneeJohnson & Johnson Vision Care, Inc.
InventorsDonnie J. Duis, Yongcheng Li, Leilani K. Sonoda, Holly L. Grammer
Life of this patent
Estimating the term…
Abstract
A method for making a hydrogel, photochromic contact lens including supplying a first lens composition comprising a contact lens monomer and a photochromic material to a front contact lens mold and supplying a second lens composition to said contact lens mold wherein the viscosity of said first composition is at least about 1000 cp greater than the viscosity of said second contact lens composition, and the makeup of said second composition matches the of said first composition to reduce strain between said compositions of the resulting lens.
Claims16
A method for making a photochromic, hydrogel contact lens comprising:
- dosing a first hydrogel lens composition to a front contact lens mold part;
- wherein the first hydrogel lens composition comprises at least one contact lens monomer and a photochromic material;
- dosing a second hydrogel lens composition to said contact lens mold part on the top of the first composition wherein the first composition has a viscosity greater than the viscosity of said second contact lens composition;
- positioning a second mold part proximate to the first mold part thereby forming a lens cavity with the first lens composition and the second composition within the lens cavity, and curing said first and second compositions to form said hydrogel contact lens having an actual sagittal depth within about 100 microns of a design sagittal depth, and wherein said first and second lens compositions, when cured, have expansion factors which are within 10% of each other.
A method for making a photochromic, hydrogel contact lens comprising:
- dosing a first hydrogel lens composition to a front contact lens mold part;
- wherein the first hydrogel lens composition comprises at least one contact lens monomer and a photochromic material;
- dosing a second hydrogel lens composition to said contact lens mold part on the top of the first composition wherein the first composition has a viscosity greater than the viscosity of said second contact lens composition;
- positioning a second mold part proximate to the first mold part thereby forming a lens cavity with the first lens composition and the second composition within the lens cavity, and curing said first and second compositions to form said hydrogel contact lens having a modulus of less than about 200 psi and an actual sagittal depth within about 100 microns of a design sagittal depth.
A method for making a photochromic, hydrogel contact lens comprising:
- dosing a first hydrogel lens composition to a front contact lens mold part;
- wherein the first hydrogel lens composition comprises at least one contact lens monomer and a photochromic material;
- dosing a second hydrogel lens composition to said contact lens mold part on the top of the first composition wherein the first composition has a viscosity greater than the viscosity of said second contact lens composition;
- positioning a second mold part proximate to the first mold part thereby forming a lens cavity with the first lens composition and the second composition within the lens cavity, and curing said first and second compositions to form said hydrogel contact lens having water content between about 20 and about 75% and an actual sagittal depth within about 100 microns of a design sagittal depth, wherein said first and second lens compositions, when cured, have water contents which are within 10% of each other.
Dependencies are inferred from the claim text.