Voluntary nystagmus is a pendular, rapid, primarily horizontal oscillation of the eyes, without a slow phase, often initiated and maintained by voluntary effort, its duration limited by fatigue. We present a case of 13-year old girl with nystagmus, severe headache and nausea. On examination the subject's eyes moved normally, but during fixation at near point horizontal nystagmus was observed and the girl complained about blurred vision. Otherwise, opthalmological examination and brain MRI revealed no abnormalities. Close observation of the girl proved that she can produce nystagmus voluntarily. Voluntary nystagmus should be considered in every individual case of patients diagnosed with isolated, intermittent nystagmus, especially of those without ophthalmologically or neurologically pathologic findings.
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