Contact lens having at least one aspherical, progressive multi-focal 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

Abstract From the Canadian patent

The invention concerns an spherical multifocal contact lens comprising at least one optical zone for the vision for near and at least one optical zone for the vision for far, without interdediary line and without transition between said zones said asphe-, rical face being foreseen to define a central optical zone with a predetermined great aberration on a, predetermined size,said great aberration of said central optical zone being the greatest of said lens this, contact lens provides a better quality of correction and a better clearness of image and can be used as an intra-ocular implant to be substituted for the eye crystalline lens.