nystagmus
nounA rapid, involuntary, oscillatory motion of the eyeball.
nounIn medicine, involuntary lateral oscillatory (sometimes rotatory, rarely vertical) motion of the eyes.
nounA rapid involuntary oscillation of the eyeballs.
nounrapid involuntary
involuntary movements of the eyeballs; its presence or absence is used to diagnose a variety of neurological and visual disorders