corneal endothelial dystrophy hereditary disease posterior corneal dystrophy posterior polymorphous corneal dystrophy Orphanet:98973 PPCD Schlichting dystrophy corneal dystrophy, posterior polymorphous 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. UMLS:C0339284 GARD:0016882 MONDO:0020364 posterior polymorphous dystrophy icd11.foundation:935421185 MEDGEN:87382 OMIMPS:122000 DOID:0060457