Patent ID: 6102544
Filing Date: 2000-08-15
Classification: G02C

Abstract:
A multifocal ophthalmic lens comprising an aspherical surface having at every point thereon a mean sphere and a cylinder, said lens having a power addition and comprising a far vision region VL, a near vision region VP, an intermediate vision region VI, a main meridian of progression MM' passing through said three regions, and a power addition,in which a principal length of progression as defined herein is shorter than 16 mm,a maximum value .vertline.dS/d.theta..vertline..sub.max of a modulus of the tangential derivative of mean sphere on a 40 mm diameter circle centered on a geometric center of said lens is less than one quarter of the maximum value P.sub.mer of a slope of mean sphere along said meridian:.vertline.dS/d.theta..vertline..sub.max /P.sub.mer <0.25and a maximum value C.sub.max of cylinder inside said circle is less than a nominal power addition of said lens:C.sub.max <A.sub.nom.2.