Predicted to enable transcription cis-regulatory region binding activity. Acts upstream of or within neuron maturation; retinal bipolar neuron differentiation; and visual perception. Located in nucleus. Is expressed in 1st branchial arch; 1st branchial arch maxillary component; brain; embryo; and eye. Human ortholog(s) of this gene implicated in corneal dystrophy; keratoconus; and posterior polymorphous corneal dystrophy 1. Orthologous to human VSX1 (visual system homeobox 1). [provided by Alliance of Genome Resources, Apr 2022]