Acts upstream of or within optokinetic behavior and visual perception. Is expressed in retinal ganglion cell layer; retinal inner nuclear layer; retinal inner plexiform layer; and retinal outer plexiform layer. Used to study congenital stationary night blindness and congenital stationary night blindness 1A. Human ortholog(s) of this gene implicated in congenital stationary night blindness 1A and night blindness. Orthologous to human NYX (nyctalopin).