US 5,258,024 A · Method of manufacture of a lens of transparent polymer having a modulated refractive index

Abstract

The present invention relates to a method of manufacture of an optical lens providing refractive index modulation, characterized in that, starting from a lens of transparent hydrophilic polymer preferably of the hydrogel type, which has previously been shaped, the lens is impregnated with a photopolymerizable composition containing at least one monomer and a photoinitiator, which are in solution in water in the case of a hydrogel, the impregnated lens is subjected to locally modulated irradiation so as to cause local selective polymerization of the monomer, whereupon the excess non-hardened photoinitiator and non-pulverizable monomer is removed.

Claims17

Dependent claims

A method for producing an ophthalmic lens, comprising:

impregnating a self-supportable matrix of cured polymer material in the form of said ophthalmic lens with a photopolymerizable liquid composition containing a monomer and a photoinitiator;
subjecting the material thus impregnated to local irradiation, modulated in power and/or exposure time, over the surface of said matrix according to a desired pattern of refractive index modulation corresponding to a desired bifocality of said lens, whereby said composition is cured locally according to said pattern;
and
removing the excess quantity of non-hardened composition from the material.

1 more element

Dependencies are inferred from the claim text.

Method of manufacture of a lens of transparent polymer having a modulated refractive index

Life of this patent

Method of manufacture of a lens of transparent polymer having a modulated refractive index

Life of this patent

Abstract

Claims17