Patent ID: 7303277

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, together with the base curve, is configured to generate a central zone single-valued refractive power; an outer zone, which has the form of an outer annulus surrounding the central zone, and which, together with the base curve, is configured to generate an outer zone single-valued refractive power which is less than the central zone single-valued refractive power; and an intermediary region, which has the form of an inner annulus intermediate the central zone and the outer zone, the intermediary region comprising one or more contiguous intermediate zones which are configured, together with the base curve, to generate respective one or more intermediate zone single-valued refractive powers defining a monotonic progression of decreasing refractive power from the central zone to the outer zone, so that the central zone, the one or more intemediate zones, and the outer zone are separated from each other by edges, at least one of which is non-circular.