Bietti crystalline dystrophy (BCD) is a retinal dystrophy characterized by shiny yellow crystalline deposits in the retina and sometimes the limbus with progressive chorioretinal atrophy starting in the posterior pole.1 Mutations in the CYP4V2 gene have been detected in patients with BCD.2 The gene discussed is CYP4V2; the disease is Bietti crystalline dystrophy.