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US 11,442,293 B2Granted
UV and high energy visible absorbing ophthalmic lenses
AssigneeHOYA Optical Labs of America, Inc.
InventorsSteven Harold Nahm, Richard Blacker, David Kissel, David Olund
Life of this patent
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Abstract
An ophthalmic lens operable to protect the eye from harmful ultraviolet and high energy visible wavelengths of light and methods for producing the same.
Claims20
A method of forming a light absorbing laminate of an eyeglass lens comprising:
- forming a dried polyurethane based adhesive layer containing one or more light absorbers;
- laminating a first optical film to a first side of said polyurethane based adhesive layer and a second optical film to a second side of said polyurethane based adhesive layer to form a three-layer structure of said light absorbing laminate and thereby obtaining a non-linear relationship between a thickness of said light absorbing laminate and a weight percent of said one or more light absorbers and achieving a transmittance of not more than 50 percent for wavelengths in a range of 280 to 443 nm for said light absorbing laminate.
A method of forming an eyeglass lens comprising:
- forming a polyurethane based adhesive layer containing one or more light absorbers;
- laminating a first optical film to a first side of said polyurethane based adhesive layer and a second optical film to a second side of said polyurethane based adhesive layer to form a three-layer structure of a light absorbing laminate;
- placing said three-layer structure of said light absorbing laminate into a mold and forming an eyeglass lens to achieve a transmittance of not more than 50 percent for wavelengths in a range of 280 to 443 nm, wherein a non-linear relationship exists between a thickness of said light absorbing laminate and a weight percent of said one or more light absorbers.
A method of forming an eyeglass lens having a light absorbing laminate comprising:
- forming a first solution by dissolving an isocyanate prepolymer, a polyol, a crosslinker in a solvent and adding a second solution of one or more light absorbers in said solvent into said first solution to form a polyurethane based adhesive solution containing one or more light absorbers;
- casting said adhesive solution onto a release liner and thereby forming a wet film;
- drying said wet film to remove said solvent and thus forming a dried polyurethane based adhesive layer containing one or more light absorbers;
- laminating a first optical film to a first side of said polyurethane based adhesive layer and a second optical film to a second side of said polyurethane based adhesive layer to form a three-layer structure of said light absorbing laminate;
- placing said three-layer structure of said light absorbing laminate into a mold and forming an eyeglass lens and thereby obtaining a non-linear relationship between a thickness of said light absorbing laminate and a weight percent of said one or more light absorbers and achieving a transmittance of not more than 50 percent for wavelengths in a range of 280 to 443 nm for said eyeglass lens.
2 more elements
Dependencies are inferred from the claim text.