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US 2026/0029664 A1Published application
Contact lenses with pva film
AssigneeEnChroma, Inc.
InventorsSunil K. KOOVAKKAT, Donald M. MCPHERSON, Roger William ELLICOCK, JR.
Life of this patent
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Abstract
A film with a hydrophobic water-insoluble dye embedded in polyvinyl alcohol (PVA) is disclosed. The dye is uniformly distributed throughout the film and the film has substantially no organic solvents. The film may be attached to the center of a contact lens. Such a contact lens may be used to correct or improve color vision for people with a color vision deficiency.
Claims20
A contact lens comprising:
- a lens body comprising a face and a center portion, the lens body containing no water-insoluble dyes;
- and
- a film coating the center portion of the face of the lens body, the film comprising a water-insoluble dye embedded in polyvinyl alcohol (PVA), the water-insoluble dye uniformly distributed throughout the film, the film having substantially no organic solvents.
A contact lens comprising:
- a lens body comprising a face and a center portion, the lens body containing no hydrophobic dyes;
- and
- a film coating the center portion of the face of the lens body, the film comprising a hydrophobic dye embedded in polyvinyl alcohol (PVA), the hydrophobic dye uniformly distributed throughout the film, the film having substantially no organic solvents.
A method of making a contact lens, comprising:
- providing an organic solvent that does not form an azeotropic mixture with water;
- dissolving a water-insoluble dye in the organic solvent to form a dye solution;
- mixing the dye solution with an aqueous solution of polyvinyl alcohol (PVA) to form a PVA-dye solution;
- removing substantially all of the organic solvent from the PVA-dye solution to form an aqueous PVA-dye solution;
- printing the aqueous PVA-dye solution onto a central portion of a surface of a contact lens;
- and
- curing the aqueous PVA-dye solution on the contact lens to form a PVA-dye film on the surface of the contact lens.
4 more elements
Dependencies are inferred from the claim text.