Predicted to be involved in several processes, including negative regulation of guanylate cyclase activity; retina development in camera-type eye; and visual perception. Predicted to be located in several cellular components, including perinuclear region of cytoplasm; photoreceptor inner segment; and photoreceptor outer segment. Human ortholog(s) of this gene implicated in Leber congenital amaurosis; Leber congenital amaurosis 12; and retinal degeneration. Orthologous to human RD3 (RD3 regulator of GUCY2D). [provided by Alliance of Genome Resources, Apr 2022]