  We present in this work a numerical model for characterizing the scattering
properties of the human lens. After analyzing the scattering properties of two
main scattering particles actually described in the literature through Finite
Element Method simulations, we have modified a Monte Carlo bulk scattering
algorithm for computing ray scattering in non-sequential ray tracing. We have
implemented this ray scattering algorithm in a layered model of the human lens
in order to calculate the scattering properties of the whole lens. We have
tested our algorithm by simulating the classic experiment carried out by Van
der Berg et al for measuring in vitro the angular distribution of forward
scattered light by the human lens. The results show the ability of our model to
simulate accurately the scattering properties of the human lens.
