a multifocal intraocular lens is provided having two external refractive surfaces and a longitudinal axis , and a diffractive structure superimposed on one of the surfaces in the form of a fresnel zone . to reduce eye traumatism during surgery , to shorten post - surgical time period , to increase visual acuity , and to ensure a constant quality image at any distance from an object , a multifocal intraocular lens is proposed in which at least one additional refractive surface is inserted between the two external refractive surfaces , wherein the at least one additional refractive surface divides the lens volume into zones made of materials having different refraction coefficients .