lens is selected without consideration of correction of aberration so that the critical thickness of the ophthalmic lens does not exceed a specific value and that the gradient refractive index is change rotational symmetrically about the optical axis so as to correct the aberration in this manner a significant reduction of the critical thickness of the opthalmic lens i e the center thickness is a positive lens and peripheral thickness in a negative lens is achieved while providing an ophthalmic lens having good image forming properties application_number US 5170087 A description in all the figures presented in the following fig1 11 a depicts a full scale cross section through an ophthalmic lens having a front surface 1 and a rear surface 2 furthermore illustrated is the critical thickness whose magnitude is to be reduced by means of the measures of the present invention the critical thickness is the center thickness d in plus lenses and the peripheral thickness dr in minus lenses moreover in fig1 11 a the refractive index n is plotted as a function of the distance r from the optical axis given in millimeters express reference is made to the illustrated presentation of the refractive index function with regard to the disclosure in fig1 11 b is plotted the course of the astigmatism u03b4s unbroken line and of the refraction error u03b4r broken line i e the deviation of the effect of the ophthalmic lens from the so called prescription value as a function of the visual angle astigmatism and refraction errors are given in diopters dpt the table below shows the overall effect d in dpt the effect d 1 of the front surface 1 and the effect d 2 of the rear surface.