FEATURES OF OPTICAL SURFACES OF MULTIFOCAL DIFFRACTIVE-REFRACTIVE EYE LENSES
G. A. Lenkova
Institute of Automation and Electrometry, Siberian Branch, Russian Academy of Sciences, prosp. Akademika Koptyuga 1, Novosibirsk 630090
Keywords: дифракционно-рефракционный хрусталик глаза, мультифокальные, трифокальные и квадрофокальные интраокулярные линзы, расширение фокальной области, diffractive-refractive lens, trifocal and quadrifocal lenses, lenses with an extended focal region, expansion of the focal field
Abstract
This paper considers the features of the surface structure shapes of multifocal intraocular lenses (IOLs) which, unlike bifocal IOLs form additional foci or increase the depth of focus, which provides good vision not only near and far but also at intermediate distances. The field of clear vision is achieved on the basis of the effects of diffraction, interference, and refraction (change in the radius of curvature of the lens surface). The optical characteristics of the best-known multifocal IOLs (trifocal and quadrifocal lenses and lenses with an extended focal region) are given.
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