Nystagmus


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nystagmus

[nə′stag·məs]
(medicine)
Involuntary oscillatory movement of the eyeballs.

Nystagmus

 

an involuntary, rapid rhythmic oscillation of the eyeballs. The bilateral form of nystagmus is much more common than the unilateral form. Nystagmus can be lateral, rotatory, vertical, or diagonal, depending on the direction of the oscillations of the eyeball. The condition need not be pathological. For example, rotatory nystagmus can be induced in healthy persons who are revolving in a swivel chair, optokinetic nystagmus can result from fixing the eyes on moving objects, and caloric nystagmus can result when cold or warm water is poured into the ear.

Nystagmus is pathological when it results from a morbid condition in the vestibulocochlear nerve, in the vestibular nuclei of the brainstem, or in the labyrinth of the vestibular apparatus. Nystagmus can also result from a morbid process in the cerebellum, an inflammation of the inner ear, cerebrocranial traumas, infections and toxicoses of the brain, or neoplasms in the brain. In rarer cases, nystagmus is caused by eye diseases. Miner’s nystagmus is an occupational disease in miners who work with a pick under poorly illuminated and poorly ventilated conditions. Because these workers are constantly looking up or to the side, certain eye muscles become strained.

Nystagmus is treated by eliminating the underlying cause. In cases of miner’s nystagmus, the worker is transferred to jobs above the ground.

REFERENCE

Tsimmerman, G. S. Klinicheskaia otonevrologiia. Moscow, 1952.

V. A. KARLOV

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'Following years of development, I'm delighted that this project was successful in identifying short periods of visually induced nystagmus with a high degree of accuracy,' he said.
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Schott Koln, [11] presented the first paper on the recording of nystagmus and other eye movements by means of a voltmeter.
Dr Parashkev Nachev, from University College London, told OT that the polymorphous nature of nystagmus made it a challenging area for researchers and that a more left-field approach to the condition is required.
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The type, duration, and direction of nystagmus were recorded.
[21] One of the most important considerations when assessing vestibular disorders is the presence and description of nystagmus. [21]