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US 11,635,547 B2Granted
Composition for the manufacture of an ophthalmic lens comprising an encapsulated light-absorbing additive
AssigneeEssilor International
InventorsPierre Fromentin, Tipparat Lertwattanaseri
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Abstract
The present invention relates to an ophthalmic lens which efficiently absorbs light rays without degradation of the light-absorbing additive, said ophthalmic lens comprising a composite matrix, a catalyst, a UV absorber and at least one light-absorbing additive contained in nanoparticles which are dispersed in said allyl monomer or allyl oligomer.
Claims20
An ophthalmic lens comprising a composite substrate comprising:
- a) a matrix obtained by polymerization of at least one allyl or non-allyl monomer or oligomer in presence of a catalyst for initiating the polymerization of said monomer or oligomer;
- b) at least one light-absorbing additive contained in nanoparticles which are dispersed in said matrix;
- and
- c) at least one UV absorber,
- wherein the optical transmittance through a 2 mm thick ophthalmic lens is lower than 1% for each light wavelength ranging from 280 to 400 nm, and higher than 65% for light having a wavelength of 430 nm.
2 more elements
Dependencies are inferred from the claim text.