A single publication has been reported in the literature in which a 3-month-old girl with abnormal horizontal eye movements (anomalous horizontal eye movements) underwent a series of diagnostic tests, including a karyotype study that confirmed monosomy X. This demonstrates the possibility of coexistence of FRMD7 X—a chromosome coupled with nystagmus and TS [56]. The gene discussed is FRMD7; the disease is Nystagmus.