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KMID : 1235520230220010019
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Research in Vestibular Science
2023 Volume.22 No. 1 p.19 ~ p.22
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Visual Fixation-Induced Hemi-Seesaw Nystagmus
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Kim Hyun-Sung
Oh Eun-Hye
Choi Jae-Hwan
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Abstract
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Seesaw nystagmus (SSN) is characterized by conjugate torsional nystagmus with opposite vertical components in the two eyes. The waveform may be pendular or jerk (hemi-seesaw nystagmus, HSSN), in which the slow phase corresponds to one half-cycle and the quick phase to the other. Pendular SSN and HSSN have distinct clinical presentations and underlying causes. The pathophysiology of pendular SSN may be instability of visuovestibular interactions, while the underlying mechanism for HSSN may be related to the ocular tilt reaction or an imbalance in vestibular pathways. We report a patient with HSSN due to unilateral mesodiencephalic infarction that becomes apparent during visual fixation only.
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KEYWORD
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Hemi-seesaw nystagmus, Mesodiencephalic infarction, Visual fixation
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