Nystagmus 1, Congenital, X-Linked, also known as nystagmus, infantile periodic alternating, x-linked, is related to frmd7-related infantile nystagmus and nystagmus 3, congenital, autosomal dominant. An important gene associated with Nystagmus 1, Congenital, X-Linked is FRMD7 (FERM Domain Containing 7). Affiliated tissues include eye and brain, and related phenotypes are reduced visual acuity and congenital nystagmus