Contact lens having at least one aspherical, progressive multifocal face, process for the preparation thereof and use of this contact lens as an intra-ocular implant to be substituted for the eye crystalline lens

Claim 1

A multifocal contact lens having a convex external face (4) and a concave inner face (1), said inner face (1) being aspherical and having an aberration and thus corrective power varying continuously from a center (3) of said inner face (1) towards a periphery (2, 2') of said inner face (1), said inner face (1) having a central portion (B) locatable in front of the most sensitive part of an eye and having at its center (3) a maximum aberration value which rapidly and progressively decreases radially from said center (3) within said central portion (B) and slowly towards the periphery (2, 2') of the lens so as to provide in a central zone (A) of said central portion (B), a correction for vision for near and in a portion (E) radially succeeding, a correction for vision for far, said aspherical face (1) having a shape of a portion of a surface of revolution, a meridian of which having the shape of a curve with an axis of revolution (X--X) located in a way such that said center (3) in the central zone (A) is angularly projecting towards the eye.