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Medical Definition of Congenital nystagmus
1. Nystagmus present at birth or caused by lesions sustained in utero or at the time of birth, inherited nystagmus, usually X-linked, without associated neurologic lesions and nonprogressive; all three patterns of mendelian inheritance may occur: autosomal dominant, autosomal recessive,, the nystagmus associated with albinism, achromatopsia, and hypoplasia of the macula. (05 Mar 2000)