Patent ID: 9733494
Date: 2017-08-15
CPC Classifications: A61F,G02C

Claim:
1. An ophthalmic lens for at least one of slowing, retarding or preventing myopia progression, the ophthalmic lens comprising: a first zone at a center of the ophthalmic lens; a first peripheral region continuously extending from the center, said first peripheral region having a different dioptric power than at said center; and a second peripheral region continuously extending from the first peripheral region and having a different dioptric power than that of the first peripheral region, thereby providing a continuous free form power profile having substantially equivalent visual performance to a single vision lens, and having a depth of focus and reduced retinal image quality sensitivity that slows, retards, or prevents myopia progression, the continuous free form power profile given by wherein P represents the dioptric power (D); r represents a radial distance from a geometric lens center; SA represents an amount of spherical aberration; and P PCHIP (r) represents a Piecewise Cubic Hermite Interpolating Polynomial curve control by number of points, wherein for SA equal to −0.74 D/mm 2 , the free form power profile is P(r) is calculated utilizing r values of 0.00 mm, 0.81 mm 1.63 mm, 2.44 mm and 3.25 mm with corresponding P PCHIP (r) values of −0.23 D, −0.64 D, −0.94 D, 0.21 D and 1.04 D respectively.