Extremely pure glasses of poly(methyl methacrylate), PΜΜA, and polystyrene, PS, have been prepared for examination of bulk scattering and absorption properties. PS, which is atactic, forms glasses which show no excess light scattering whatever; these glasses resemble liquids. PMMA, on the other hand, is predominantly syndiotactic. Glassy PΜΜA has intense forward scattering from intrinsic heterogeneities characterized by a dimension of ~70 nm. The concentration and size of these structures are controlled by tacticity and molecular weight of the macromolecules and by the temperature history of the glass. These scattering studies have been complemented by laser calorimetry to measure optical absorption over the range of wavelengths λ = 490-680 nm. Here the differences in absorption are attributed to the chemical compositions of the two glasses. From the combined effects of scattering and absorption, total losses of 100-200 dB/km are anticipated from the bulk properties of polymer glasses.