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Clinical Features of Torsional<br />
<strong>Nystagmus</strong><br />
Torsional jerk nystagmus (minimal vertical<br />
or horizontal components) present with<br />
eye close to central position.<br />
Slow phases may have linear-, increasing-<br />
, or decreasing-velocity waveforms<br />
Poorly suppressed by visual fixation of a<br />
distant target<br />
Exacerbated by changes in head position<br />
or vigorous head shaking<br />
Leigh JR and Zee DS. The Neurology of Eye Movements 4 th Edition.<br />
Oxford University Press, New York 2006 with permission
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