The mother and three of three siblings in a family can produce voluntary nystagmus. The phenomenon has been observed among siblings previously, but never in two generations. It is suggested that a dominant trait with high penetrance is involved.
Keyes MJ. Voluntary Nystagmus in Two Generations. Arch Neurol. 1973;29(1):63–64. doi:10.1001/archneur.1973.00490250081011
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