  The optical properties have been studied using the dynamical mean-field
theory (DMFT) on a disordered Hubbard model. Despite the fact that disorder
turns a metal to an insulator in high dimensional correlated materials, we
notice that it can enhance certain metallic behavior as if a chemical pressure
is applied to the system resulting in an increase of the effective lattice
bandwidth (BW). We study optical properties in such a scenario and compare
results with experiments where the BW is changed through chemical doping and
obtain remarkable similarities vindicating our claim. We also make a point that
these similarities differ from some other forms of BW tuned optical effects.
