nystagmus
/nɪˈstaɡməs
/noun [mass noun]
Rapid involuntary movements of the eyes.Potentially serious neurologic disease should be suspected in patients with focal neurologic signs, severe ataxia, nystagmus changing direction, vertical nystagmus and abnormal eye movement....
- Tremor can be found in multiple sclerosis often with slurred speech and jerky eye movements, called nystagmus.
- Albinos regularly turn their heads to the side and roll their eyes in a circular motion in an attempt to find a favourable axis of sight; they suffer from rapid nystagmus, and blink constantly.
Derivatives
nystagmic
- Failure of adaptation of nystagmic eye movements to occur under certain conditions of stimulation by angular acceleration has been ascribed to a failure to allow the eye-movement response to run its course.
- The invention provides a tinted pair of lenses for overcoming the deleterious effects of nystagmic oscillations, particularly in persons suffering from dyslexia.
- With no attention to individual objects, gaze velocity is low but nystagmic frequency is high (stare nystagmus).
Origin
Early 19th century: from Greek nustagmos 'nodding, drowsiness', from nustazein 'nod, be sleepy'.
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