Optical system, in particular intraocular lens, contact lens

Intraocular lenses, for example intraocular implants, contact lenses and the like. The optical system is made of a material whereof the refractive index varies along at least one given direction, this material being a homogeneous material with variable index according to its chemical composition or by the action of mechanical effects, or a heterogeneous material with different molecular orientations. The invention is useful for making lenses with accommodative sighting.