| 摘要 |
<p>A multifocal contact lens (200) customized for a patient has, in accordance with the present invention, an anterior side with a power curve defined in part by (i) a central aspheric surface (202), (ii) an inner annular surface (204) contiguous with the central aspheric surface (202), (iii) a second annular surface (206) contiguous along a radially inner periphery (208) with the inner annular aspheric surface (204), and (iv) an outer annular surface (210) contiguous along a radially inner periphery (212) with the seond annular aspheric surface (206). Each of the annular surfaces (204) and (210) is concentric or coaxial with the central aspheric surface (202). The central aspheric surface (202) corresponds to a distance vision correction zone. The inner annular surface (204) 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 (206) corresponds to a near vision correction zone, and the outer annular surface (210) corresponds to a distant vision correction zone.</p> |
