BIFOCAL INTRAOCULAR LENS Russian patent published in 1997 - IPC

FIELD: ophthalmology. SUBSTANCE: bifocal intraocular lens includes optical component made of double refractive polymeric material having refraction factor n₀ for usual beams and refraction factor n_e for unusual beams as a result of stretching under controlled conditions. Optical component is made as single lens manufactured entirely of double refractive polymeric material. In this case, double refraction δ_n of the above-indicated polymeric material equal to (n_e- n_o) makes up after stretching or , where D_min and D_max are preset values of minimum and maximum optical force; n_m is refraction factor of medium in which lens is placed. EFFECT: efficient manufacturing process. 3 dwg