MULTIFOCAL CONTACT LENS

摘要

A multifocal contact lens having concentric bands of different lens curves, wherein a plurality of curves for farsightedness alternate with a plurality of curves for nearsightedness. A mold for the lens and a production method thereof are also provided. Farsight curve surfaces (F1, F2, ...) of the lens curve (2) have centers of curvature (OF1, OF2, ...) on the optical axis, and radiuses of curvature (RF1, RF2, ...) set so that rays of light incident into farsight curve surfaces and parallel to the optical axis form an image effectively at a single farsight focus on the optical axis. Nearsight curve surfaces (N1, N2, ...) of the lens curve have centers of curvature (ON1, ON2, ...) on the optical axis, and radiuses of curvature (RN1, RN2, ...) set so that rays of light incident into nearsight curve surfaces and parallel to the optical axis form an image effectively at a single nearsight focus (FN) on the optical axis.