Posterior polymorphous corneal dystrophy (PPCD) is a rare mild subtype of posterior corneal dystrophy characterized by small aggregates of apparent vesicles bordered by a gray haze at the level of Descemet membrane, generally with no effect on vision. The disease is Monarch Disease Ontology id MONDO_0020364 (posterior polymorphous corneal dystrophy). Also known as: PPCD, Schlichting dystrophy, corneal dystrophy, posterior polymorphous, hereditary polymorphus posterior corneal dystrophy, posterior polymorphous dystrophy.