US 7,506,983 B2
Method of optical treatment
Chi Ho To, Hong Kong (China); Siu Yin Lam, Hong Kong (China); and Shau Kei Wan, Hong Kong (China)
Assigned to The Hong Kong Polytechnic University, Hunghom, Kowloon (Hong Kong Special Administrative Region of the People's Republic of China, The)
Filed on Sep. 30, 2004, as Appl. No. 10/954,631.
Prior Publication US 2006/0082729 A1, Apr. 20, 2006
Int. Cl. A61B 3/00 (2006.01)
U.S. Cl. 351—246  [351/168; 351/159] 6 Claims
OG exemplary drawing
 
1. A method for retarding the progression of myopia or hyperopia in a human eye, the method comprising:
(a) providing a Fresnel concentric multi-focal lens comprising primary optical zones having a primary refractive power and secondary optical zones having at least one secondary refractive power; and
(b) correcting the myopia or hyperopia with the primary refractive power and generating at least one defocus with the secondary refractive power,
wherein the primary optical zones enable near and distant objects to be viewed; and the secondary optical zones generate myopic defocus to retard myopia or generate hyperopic defocus to retard hyperopia.