Bietti crystalline dystrophy (Orphanet rare-disease nomenclature term Orphanet_41751) can be described as follows. Bietti's crystalline dystrophy (BCD) is a rare progressive autosomal recessive tapetoretinal degeneration disease, occurring in the third decade of life, characterized by small sparkling crystalline deposits in the posterior retina and corneal limbus in addition to sclerosis of the choroidal vessels and manifesting as nightblindness, decreased vision, paracentral scotoma, and, in the end stages of the disease, legal blindness. Also known as: BCD, Bietti crystalline corneoretinal dystrophy, Bietti crystalline retinopathy.