Patent ID: 7735997

Claim:
A rigid contact lens for correcting an irregularly curved cornea, comprising a front surface ( 2 ) and a rear surface ( 3 ) which consists of a central optical zone ( 4 ) defining the optical properties of the contact lens and a peripheral zone (5) serving to seat the contact lens; wherein the central optical zone ( 4 ) has such an aspherical rotationally symmetric or non-rotationally symmetric shape that, with equal central curvature radius in the center (Z) of the central optical zone ( 4 ), the sagittal depth (s ellip ) of the central optical zone ( 4 ) is increased as compared with a spherical optical zone, and wherein the curvature radius of the central optical zone ( 4 ) constantly decreases progressively or monotonically from the center (Z) of the central optical zone towards the periphery thereof.