Processes for obtaining an impact resistant, abrasion and/or scratch resistant photochromic article comprising a substrate having two main faces, comprising: preparing a curable coating composition comprising at least one unblocked polyisocyanate terminated polyurethane pre-polymer, at least one polyol, and at least one photochromic agent; depositing the curable coating composition onto at least part of a main face of the substrate; curing the coating composition for 10 minutes or less, at a temperature lower than or equal to 100° C. to form an impact resistant photochromic coating; forming an abrasion and/or scratch resistant coating on the impact resistant photochromic coating or forming a protective coating on the impact resistant photochromic coating and then forming an abrasion and/or scratch resistant coating on said protective coating. Articles obtainable by such processes, including but not limited to ophthalmic lenses. Curable coating compositions involved in such processes.