Upbeat Nystagmus a clinical and pathophysiological aid

Upbeat nystagmus (UBN) is a form of central nystagmus characterized by a slow downward drift of the eyes followed by a corrective quick phase upward.
It may present as spontaneous, gaze-evoked, or be influenced by head or body position. Clinically, patients frequently report symptoms such as oscillopsia (illusory movement of the visual environment), vertical diplopia, postural unsteadiness, or balance disturbances. In some cases, however, UBN may remain asymptomatic and is discovered incidentally during routine neurological or vestibular examinations.

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