ABCA4 and age related macular degeneration 2: Mutations in the ABCA4 gene can cause various retinal diseases such as autosomal recessive (ar)-Stargardt disease (STGD1, OMIM # 248200), ar-cone-rod dystrophy (CORD3, OMIM # 604116), ar-cone dystrophy (COD), ar-retinitis pigmentosa (RP19, OMIM # 601718), and age-related macular degeneration-2 (ARMD2, OMIM # 153800) (van Driel et al., 1998; Baum et al., 2003; Burke and Tsang, 2011; Xin et al., 2015; Wang et al., 2018; Koyanagi et al., 2019).