Changes in light diffusion rate and refraction coefficient are analysed and based on symmetry viewpoint in this article. Acting with light waves (cause) on the crystalline field it is taking place the rising of symmetry order of light refraction coefficient concerning symmetry of crystalline field (crystal). Symmetry of light refraction coefficients for all crystals are higher than symmetry of corresponding crystal structure. Symmetry of light diffusion coefficients of crystals don't comply with P.Curie universal principle of symmetry.