A method for producing a photochromic synthetic resin object, comprising:(a) applying a layer, comprising at least one liquid monomer suitable for forming a polymer and at least one photochromic dyestuff, to at least one internal surface area of a first casting mold situated in a casting assembly, and partially or completely curing the layer to form a photochromic polymer layer; (b) optionally applying a protective layer to the completely or partially cured photochromic polymer layer, and curing the protective layer; (c) introducing a casting resin into the casting assembly which comprises a predetermined mold cavity formed by the first casting mold together with a second casting mold in the casting assembly, and (d) curing the casting resin to form a photochromic synthetic resin object; and a photochromic synthetic resin object produced by this method.