Flippase that catalyzes in an ATP-dependent manner the transport of retinal-phosphatidylethanolamine conjugates like 11-cis and all-trans isomers of N-retinylidene-phosphatidylethanolamine (N- Ret-PE) from the lumen to the cytoplasmic leaflet of photoreceptor outer segment disk membranes, where 11-cis-retinylidene- phosphatidylethanolamine is then isomerized to its all-trans isomer and reduced by RDH8 to produce all-trans-retinol. This transport activity ensures that all-trans-retinal generated from photoexcitation and 11- cis-retinal not needed for the regeneration of rhodopsin and cone opsins are effectively cleared from the photoreceptors, therefore preventing their accumulation and the formation of toxic bisretinoid (PubMed:10075733, PubMed:20404325, PubMed:22735453, PubMed:23144455, PubMed:24097981, PubMed:29847635, PubMed:33375396). Displays ATPase activity in vitro in absence of retinal substrate (PubMed:33605212, PubMed:39128720, PubMed:29847635, PubMed:33375396). May display GTPase activity that is strongly influenced by the lipid environment and the presence of retinoid compounds (PubMed:22735453). Binds the unprotonated form of N-retinylidene-phosphatidylethanolamine with high affinity in the absence of ATP, and ATP binding and hydrolysis induce a protein conformational change that causes N-retinylidene- phosphatidylethanolamine release (By similarity). {ECO:0000250|UniProtKB:F1MWM0, ECO:0000269|PubMed:10075733, ECO:0000269|PubMed:20404325, ECO:0000269|PubMed:22735453, ECO:0000269|PubMed:23144455, ECO:0000269|PubMed:24097981, ECO:0000269|PubMed:29847635, ECO:0000269|PubMed:33375396, ECO:0000269|PubMed:33605212, ECO:0000269|PubMed:39128720}. This is the function of Ensembl gene identifier ENSG00000198691 (ABCA4, ATP binding cassette subfamily A member 4).