Patent ID: 7101042

Claim:
A contact lens, comprising a transparent material having front and rear surfaces, wherein the rear surface comprises a base curve which is adapted to fit an eye of a wearer of the lens, and wherein the front surface comprises: a central zone which has a first cylindrical curvature along a first axis and a second cylindrical curvature, different from the first cylindrical curvature, along a second axis, and which, together with the base curve, is configured to generate a first central-zone refractive power along the first axis and a second central-zone refractive power along the second axis, the first and second central-zone refractive powers differing by an astigmatic factor; an outer zone which has a third cylindrical curvature along the first axis and a fourth cylindrical curvature, different from the third cylindrical curvature, along the second axis, and which, together with the base curve, is configured to generate a first outer-zone refractive power along the first axis which is less than the first central-zone power and a second outer-zone refractive power along the second axis which is less than the first outer-zone refractive power by the astigmatic factor; and an intermediary region, intermediate the central zone and the outer zone, comprising one or more contiguous intermediate zones, each intermediate zone having a respective fifth cylindrical curvature along the first axis and a sixth cylindrical curvature, different from the fifth cylindrical curvature, along the second axis, so that the one or more intermediate zones, together with the base curve, generate respectively one or more first intermediate-zone refractive powers along the first axis defining a first monotonic progression of decreasing refractive power from the first central-zone refractive power to the first outer-zone refractive power, and one or more second intermediate-zone refractive powers along the second axis defining a second monotonic progression of decreasing refractive power from the second central zone refractive power to the second outer zone refractive power.