ABCA4 and severe early-childhood-onset retinal dystrophy: This complex arena of genes and clinical features complicates the nomenclature in this field; it is unclear how to classify individuals with classic Stargardt phenotype lacking recessive mutations in ABCA4. While we do not limit the term “retinitis pigmentosa” to a phenotype caused by mutations in a single gene, there are those who believe STGD should be restricted to only those cases caused by ABCA4 mutations and “Stargardt-like” or juvenile macular dystrophy should be used for other genetic etiologies.