Involuntary movements of the eyeballs. The presence or absence of nystagmus is often used in the diagnosis of a variety of neurological and visual disorders.

Involuntary, rapid, rhythmic movement of the eyeball.

Repetitive and involuntary movement of the eyes.

Rhythmic, involuntary oscillations of one or both eyes related to abnormality in fixation, conjugate gaze, or vestibular mechanisms.

(nystagmus, pathologic) Involuntary movements of the eye that are divided into two types, jerk and pendular. Jerk nystagmus has a slow phase in one direction followed by a corrective fast phase in the opposite direction, and is usually caused by central or peripheral vestibular dysfunction. Pendular nystagmus features oscillations that are of equal velocity in both directions and this condition is often associated with visual loss early in life. (Adams et al., Principles of Neurology, 6th ed, p272)

A disorder characterized by involuntary movements of the eyeballs.

Nystagmus is a rhythmic movement of the eyes that can have various causes. Vestibular disorders can result in nystagmus because the vestibular system and the oculomotor nuclei are interconnected. The presence of vestibular nystagmus helps identify vestibular disorders and sometimes distinguishes central from peripheral vertigo....

Nystagmus, involuntary back and forth, up and down, or circular movements of the eyes that are often described by observers as "jumping" or "dancing" eye movements. One type of nystagmus, called pendular nystagmus, is characterized by even, smooth eye movements, whereas in the type referred to as...