the invention relates to an injection molding method for the production of a complex , high optical quality light - diffusing molded item . the molding material used comprises a matrix made of polymethylacrylate and spherical plastic particles whose particle size ranges from 1 - 24 μm and the concentration thereof ranges from 0 . 05 - 30 wt .-% in relation to the weight of the polymethylacrylate . the spherical particles exhibit a refractive index differential in relation to the polymethylacrylate matrix of 0 . 01 0 . 2 .