In sight correction technologies, it is of extreme importance to know what outcome of the planned operation could be. Conventionally, cornea shape is measured, or even refraction distribution in the eye, that are used for calculations of the to-be-ablated cornea layers. Unfortunately, different obstacles could arise, involving errors in these calculations. We propose another approach of measuring the to-be-inserted aberrations that would compensate for existing aberrations to get maximal sight acuity. The approach is based on measurements of wave front aberrations at the exit of an eye and iterative procedure of phase conjugation of the wave front, entering the eye. As a result of the procedure, an optimized point spread function is achieved. Shack-Hartmann sensors are used for wave front measurements, and spatial modulators -- for wave front control. Local slopes of wave front being measured, Wiener-type filtering helps to reconstruct the wave front itself. The results are reported of single-pass and double-pass modeling with experimental setup and computer simulation.