The function of ENSG00000100987 (VSX1, visual system homeobox 1) is as follows. Binds to the 37-bp core of the locus control region (LCR) of the red/green visual pigment gene cluster (PubMed:10903837). May regulate the activity of the LCR and the cone opsin genes at earlier stages of development (PubMed:10903837). Dispensable in early retinal development (By similarity). {ECO:0000250|UniProtKB:Q91V10, ECO:0000269|PubMed:10903837}.