Patent ID: 6929366

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 circular zone which is spherically curved and which, together with the base curve, is configured to generate a central zone refractive power selected so as to correct near vision of the wearer; an annular outer zone which is spherically curved and which, together with the base curve, is configured to generate an outer zone refractive power which is less than the central zone power; and an annular region, intermediate the central zone and the outer zone, comprising one or more contiguous intermediate annular zones, each of which is spherically curved, the one or more intermediate annular zones being configured, together with the base curve, to generate respective one or more intermediate zone refractive powers defining a monotonic progression of decreasing refractive power from the central zone to the annular outer zone, wherein the outer zone refractive power is between approximately 1 diopter and approximately 2 diopters leass than the central zone refractive power and wherein the one or more intermediate annular zones comprise two or more intermediate annular zones having differing powers, and wherein the two or more intermediate zones comprise approximately equal widths.