Biallelic mutations in ABCA4, a gene located at 1p22.1 and encoding the retina-specific transmembrane protein involved in the transport of retinoids in the visual cycle, cause Stargardt disease (STGD), a recessive macular dystrophy regarded as one of the most prevalent inherited retinal disorders in humans (Tsang and Sharma, 2018). Here, ABCA4 is linked to severe early-childhood-onset retinal dystrophy.