QLT Inc., is a biotechnology company. The Company is engaged in the development and commercialization of ocular products. It develops QLT091001, a synthetic retinoid compound for the potential treatment of certain inherited retinal degenerative diseases. In September 2012,it sold all of its assets related to Visudyne to Valeant Pharmaceuticals International, Inc. (Valeant). It also sold Qcellus laser and certain other photodynamic therapy intellectual property, In April 2013, it sold its punctal plug drug delivery system (PPDS) technology (Technology) to Mati Therapeutics Inc. (Mati). It is engaged in providing transition services to Valeant concerning most of the aspects of the Visudyne and Qcellus laser business. It is conducting Phase Ib clinical proof-of-concept studies of QLT091001, a synthetic retinoid replacement therapy for 11-cis-retinal, a key biochemical component of the visual retinoid cycle, in patients with Leber Congenital Amaurosis (LCA) and Retinitis Pigmentosa (RP).