Systems and methods are provided for predicting the results of a therapeutic intervention to an eye. The composition contains aromatic polycarbonate, graft polymer, a specifically structured phosphorous compound, fluorinated polyolefin and inorganic compound with an average particle size no greater that 200 nm and an optional vinylpolymer. And provided is a substrate for the optical device, which includes a scattering layer having excellent scattering properties and having a desired refractive index while retaining surface smoothness. The lower flange cooperates with the pair of substantially vertical, elongated flanges to define a slot. Each arm is provided with a track to hold onto the reinforcement rod.