Patent ID: 8240847

Claim:
A non-multifocal contact lens for use in reducing the progression of myopia in an eye of a wearer, wherein a diameter of the pupil of the eye is at least 3.8 mm in diameter, comprising: a transparent material having front and rear surfaces, wherein the rear surface provides a base-curve adapted to fit the eye; and wherein the front surface comprises: a central optical zone curved so that, together with the base-curve, said central optical zone produces a central optical zone refractive power adapted to provide the wearer with clear foveal vision, wherein the central optical zone does not include multiple zones that provide multiple foci on the central retina, the central optical zone being substantially circular in shape and having a dimension approximating said diameter of the pupil of the eye when the lens is worn by a wearer on said eye; an annular peripheral optical zone surrounding said central optical zone and curved so that, together with the base-curve, said peripheral optical zone is adapted to produce a peripheral optical zone refractive power, when the lens is worn, that is greater than said central optical zone refractive power by an amount greater than 1 Diopter and sufficient to focus off-axis rays that enter the eye through said peripheral optical zone onto a focal plane that is substantially on, or anterior to, the retina in a peripheral region of the retina located around said central optical zone, the annular peripheral optical zone occupying at least a portion of an annulus with an inner diameter of 4.5 mm and an outer diameter of 8 mm; and a transition zone between the central optical zone and the annular peripheral zone in which the refractive power transitions between the central optical zone and the annular peripheral optical zone.