Patent ID: 7192138

Claim:
An ophthalmic lens, comprising an optical zone having a center and a spaced-apart periphery, the optical zone having a first corrective power range in a first region and a second corrective power range in an annular region that surrounds the first region, wherein the surface of the first region is described by a spline function and wherein the surface of the annular region is described by a polynomial or conic function; the lower limit of the first corrective power range being equal approximately to the manifest corrective refractive power for an eye; the upper limit of the second corrective power range being equal approximately to the manifest corrective refractive power for the eye; the second corrective power range having negative spherical aberration varying with diameter and being less than the manifest corrective refractive power for an eye at the periphery of the optical zone; and the optical zone having a power profile such that the optical power of the optical zone decreases from the center to the periphery of the optical zone.