MULTIFOCAL CONTACT LENS

摘要

The lens is provided with an anterior side with a power curve defined in part by a central aspheric surface. An inner annular surface is contiguous with the central aspheric surface, and a second annular surface contiguous along a radially inner periphery with the inner annular aspheric surface. An outer annular surface contiguous along a radially inner periphery with the second annular aspheric surface. Each of the annular surfaces is concentric or coaxial with the central aspheric surface. The central aspheric surface corresponds to a distance vision correction zone. The inner annular surface is an aspheric surface corresponding to a progressive add zone with a standard eccentricity between approximately -1.5 and approximately -5.0. The second annular surface corresponds to a near vision correction zone, and the outer annular surface corresponds to a distant vision correction zone.