Patent ID: 7267435
Filing Date: 2007-09-11
Classification: G02C

Abstract:
1. 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; 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.