Patent ID: 6231182
Filing Date: 2001-05-15
Classification: G02C

Abstract:
A monofocal ophthalmic lens comprising:a front and a rear surface, each of which is aspherical,at least one of the front and rear surfaces has identical principle of radii of curvature in the apex,the average surface refracting power of at least one of the front and rear surfaces is defined by the formula:B.sub.f =(n-1)/2*(1/R.sub.1 +1/R.sub.2)whereinn: is the refractive index of the lens medium,R.sub.1 : is the radius of principle curvature 1 in a point of at least one of the front and rear surfaces in a first principle plane, andR.sub.2 : is the radius of principle curvature 2 in the point of the at least one of the front and rear surfaces in a second principle plane, andwherein the average surface refracting power of points on the at least one of the front and rear surfaces is the function of the distance h at constant azimuthal angle of .OMEGA. of each point from the apex, and the function includes at least one of an extreme value and a value 0.