MULTIFOCAL CONTACT LENS

摘要

A multifocal contact lens (200) customized for a patient has an anterior side with a power curve defined in part by (i) a central spheric aspheric surface (202), (ii) and inner annular spheric surface (204) contiguous with the central aspheric surface, (iii) a second annular spheric surface (206) contiguous along a radially inner periphery with the inner annular spheric surface, and (iv) an outer annular spheric surface (210) contiguous along a radially inner periphery with the second annular spheric surface. Each of the annular spheric surfaces is concentric or coaxial with the central aspheric surface. The central aspheric surface corresponds to a distance vision correction zone. The inner annular spheric surface corresponds to an intermediate vision correction zone. The second annular spheric surface corresponds to a near vision correction zone, and the outer annular spheric surface corresponds to a distant vision correction zone.