- a congenital or acquired persistent, rapid, involuntary, and oscillatory movement of the eyeball, usually from side to side.
Origin of nystagmus
1815–25; < New Latin < Greek nystagmós nodding, derivative of nystázein to nod
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
Examples from the Web for nystagmus
On the right, nystagmus on fixation, fingers are counted at 5-6 feet.
These were nystagmus, paresis of facial muscles, laryngeal spasms, etc.
Nystagmus occasionally occurs in monocular fixation (with exclusion of the other eye).
Not to complicate the question, however, I have excluded all cases of nystagmus from the following investigation.
In Figure L 3a the nystagmus occurs only in males and descends through unaffected females.
- involuntary movement of the eye comprising a smooth drift followed by a flick back, occurring in several situations, for example after the body has been rotated or in disorders of the cerebellum
C19: New Latin, from Greek nustagmos
Word Origin and History for nystagmus
medical Latin, from Greek nystagmos "nodding, drowsiness," from nystazein "to nod, be sleepy," from PIE *sneud(h)- "to be sleepy."
Online Etymology Dictionary, © 2010 Douglas Harper
- A rapid, involuntary oscillatory motion of the eyeball.