Nystagmus

[ni'stægmәs]

(noun.) involuntary movements of the eyeballs; its presence or absence is used to diagnose a variety of neurological and visual disorders.

Editor: Pratt--From WordNet

(n.) A rapid involuntary oscillation of the eyeballs.

Inputed by Josiah

n. a spasmodic lateral oscillatory movement of the eyes found in miners &c.

Checker: Muriel