Numerical calculation of the corneal transmittance

Obtention of the phase transmitatnce of the cornea under the paraxial assumption does not provide accurate estimation of the corneal aberrations, for wide apertures of the-pupil. On the other hand, exact ray tracing will require a huge amount of calculations band does not provide uniform sampling of the energy distribution at the output. We propose to use a simple approximation that takes into account non-paraxial effects. This approximation allow obtention of a well sampled output plane at no addicional computational cost.