Contact lens
AssigneeCooperVision International Limited
InventorsRobert Andrew Broad, Yuwen Liu, William Mitchell
Life of this patent
Estimating the term…
Abstract
The present disclosure provides a contact lens comprising a first colourant which is a blue-blocking colourant having an absorption maximum (λmax) in the range of from 415 nm to 455 nm and a second colourant, wherein the second colourant is a polymerizable dye having an absorption maximum (λmax) in the range of from 470 nm to 600 nm, and optionally also comprising a third colourant which is a colourant having an absorption maximum in the range of from greater than 600 nm to 800 nm. A method of making the lens is also provided.
Claims22
A contact lens comprising a polymeric matrix formed from the polymerization of a polymerizable composition comprising one or more monomers, a first colourant which is a blue-blocking colourant having an absorption maximum (λmax) in the range of from 415 nm to 455 nm and a second colourant, wherein the second colourant is a polymerizable dye having an absorption maximum (λmax) in the range of from 470 nm to 600 nm, wherein the first colourant and the second colourant are present in the contact lens, and the second colourant balances the colour of the first colourant such that the contact lens is colourless, grey or blue.
A method of making a contact lens comprising the steps of polymerizing a polymerizable composition comprising one or more monomers, a first colourant which is a blue-blocking colourant having an absorption maximum (λmax) in the range of from 415 nm to 455 nm and a second colourant, wherein the second colourant is a polymerizable dye having an absorption maximum (λmax) in the range of from 470 nm to 600 nm,
- in a mould to form a lens-shaped polymerization product comprising a polymeric matrix, wherein the second colourant balances the colour of the first colourant such that the contact lens is colourless, grey or blue.
Dependencies are inferred from the claim text.