Defects in NYX are the cause of congenital stationary night blindness type 1A (CSNB1A); also called X- linked congenital stationary night blindness (XLCSNB). Congenital stationary night blindness is a non-progressive retinal disorder characterized by impaired night vision. CSNB1A is characterized by impaired scotopic vision, myopia, hyperopia, nystagmus and reduced visual acuity. Belongs to the small leucine-rich proteoglycan (SLRP) family. SLRP class IV subfamily. Note: This description may include information from UniProtKB.