Patent ID: 8465543

Claim:
An intraocular lens for the correction of an astigmatic ametropia comprising a torically refractive lens surface, wherein a total section curve in a principal meridian of the torically refractive lens surface in a plane parallel to a lens axis is described by an asphere according to an equation: y =√{square root over (2 Rx −(1 +asp ) x 2 )} or x = y 2 / R 1 + 1 - ( 1 + asp ) ⁢ y 2 / R 2 + ∑ j ⁢ c j ⁢ y j wherein x is a first coordinate axis being in the direction of the lens axis, y is a second coordinate axis being in the direction of a first principal meridian, R is a radius or parameter at an apex of the lens, asp is an asphericity in the meridian, cj are polynomial coefficients, wherein R is a value of a radius R 1 of a curvature of the torically refractive lens surface in the first principal meridian and of a radius R 2 of a curvature of the torically refractive lens surface in a second principal meridian, wherein R 1 differs from R 2 , wherein asp is a value of a first asphericity asp 1 in the first principal meridian and of a second asphericity asp 2 in the second principal meridian of the torically refractive lens surface, wherein asp 1 is different from asp 2 , wherein a meridian forming an angle α with the first principle meridian comprises an asphericity aspα which depends on the angle α.