Graded-refractive-index optical plastic material and method for its production

A graded-refractive-index optical plastic material composed of an amorphous fluoropolymer (a) which substantially has no C-H and at least one material (b) which differs from the fluoropolymer (a) in refractive index by at least 0.001, wherein the material (b) is distributed in the fluoropolymer (a) so as to have a concentration gradient in a specific direction and a refractive index that varies continuously in said specific direction, and wherein the fluoropolymer (a) is at least one member selected from the group consisting of a fluorine-containing polyether, a fluorine-containing aromatic polyester, a fluorine-containing aromatic polycarbonate and a fluorine-containing polyimide.