REFRACTIVE-DIFFRACTIVE OPHTHALMIC DEVICE AND COMPOSITIONS USEFUL FOR PRODUCING SAME

摘要

A multifocal ophthalmic device is disclosed, wherein the lens body comprises a curcuminoid compound as a UV-light stabilizer, and/or a co-polymeric composition which is derived from a pre-polymerization mixture of monomers including 50 % to 60% of a first aromatic acrylate monomer, characterized as forming a homopolymer having a refractive index that ranges from 1.50 to 1.53; 15 % to 20 % of a second aromatic acrylate monomer, characterized as forming a homopolymer having a Tg lower by a range of 2 ºC to 30 ºC than the Tg of said first homopolymer; 10 % to 15 % of a third monomer, characterized as forming a homopolymer having a Tg lower than 35 ºC; % to 10 % of a fourth monomer, characterized as forming a homopolymer which is capable of absorbing at least 20 % of water by weight; and 2 % to 5 % of a crosslinking monomer. The lens body of the multifocal ophthalmic device is being formed with a plurality of concentric annular zones separated by slanted steps. The concentric zones effect both diffraction and refraction of incident light, while the steps are substantially devoid of any diffractive or refractive power.