a photochromic polyurethane laminate that is constructed to solve certain manufacturing difficulties involved in the production of plastic photochromic lenses is disclosed . the photochromic laminate includes at least two layers of a resinous material and a photochromic polyurethane layer that is interspersed between the two resinous layers and which contains photochromic compounds . the polyurethane layer is formed by curing a mixture of a solid thermoplastic polyurethane , at least one isocyanate prepolymer , at least one photochromic compound , and a stabilizing system .