Etymology
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nystagmus (n.)

"involuntary motion of the eyes," 1790, medical Latin, from Greek nystagmos "nodding, drowsiness," from nystazein "to nod, slumber, be sleepy," from PIE *sneud(h)- "to be sleepy." Beekes compares Baltic words such as Lithuanian snūsti "to slumber away." Related: Nystagmatic.

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Definitions of nystagmus

nystagmus (n.)
involuntary movements of the eyeballs; its presence or absence is used to diagnose a variety of neurological and visual disorders;
From wordnet.princeton.edu