The function of Ensembl gene identifier ENSG00000188107 (EYS, EGF-like photoreceptor maintenance factor) is as follows. Required to maintain the integrity of photoreceptor cells (PubMed:18836446). Specifically required for normal morphology of the photoreceptor ciliary pocket, and might thus facilitate protein trafficking between the photoreceptor inner and outer segments via the transition zone (By similarity). {ECO:0000250|UniProtKB:B8JI71, ECO:0000269|PubMed:18836446}.