The possibilities of applying specific turbidity and turbidity ratio methods in the distributional analysis of PVC and SiO2 dispersions with spherical particles are discussed. The calculations of the best estimates of distribution function parameters were performed numerically using the simplex method. For theoretical computations of light-scattering characteristics, the exact Lorenz-Mie theory was applied. A good correlation with the results of angular light scattering and electron microscopy was found.