Retinal image quality in myopic subjects after refractive surgery

In the present work, we offer a theoretical analysis of retinal image quali ty for different groups of myopes (-2D, -4D, -8D, -12D) subjected to refrac tive surgery. For this, the polychromatic optical MTF (modulation transfer function) corresponding to the far point of a myopic eye was compared with the image for the infinity point after refractive surgery. The optical qual ity of the retinal image was studied, considering the defocusing correspond ing to chromatic aberration and the spherical aberration. The results for r etinal image quality show a general deterioration, which was accentuated wi th the degree of myopia. The results suggest that refractive surgery could be improved by modifying the asphericity of the anterior surface of the cor nea, which, in addition to making the eye emetropic, would optimize the MTF of the subjects. We also present a theoretical analysis involving non-sphe rical surfaces before and after operation, testing the influence of corneal asphericity in this case, as well as the possible optimization of the poly chromatic MTF.