Sep 3, 2024 · Vertical nystagmus represents one of the most diagnostically significant forms of involuntary eye movement disorders. Unlike horizontal nystagmus, which can have various …

Purely torsional nystagmus without horizontal or vertical components indicates a defect in the brainstem, while torsional with a vertical component indicates a lesion in the midbrain.

Vertical nystagmus may be either upbeating or downbeating. When present in the straight-ahead position of gaze (i.e. the primary position) it is referred to as ‘upbeat nystagmus’ (UBN) or …

Oct 4, 2023 · If you have nystagmus, your eyes may move up and down, side to side or in a circular motion. Sometimes people are born with it (congenital nystagmus), but you can also …

These types of nystagmus may be vertical, horizontal, or torsional and often lack suppression with visual fixation. Downbeat nystagmus is particularly linked to lesions near the foramen …

An overview of nystagmus, its treatment, and the vestibular physiology relevant to nystagmus and vertigo is presented here. The approach to vertigo is discussed separately.

May 4, 2005 · The pathophysiology of spontaneous upbeat (UBN) and downbeat (DBN) nystagmus is reviewed in the light of several instructive clinical findings and experimental data.

Nov 7, 2024 · Nystagmus is an involuntary, rapid and repetitive movement of the eyes — either horizontal (side-to-side), vertical (up and down) or rotary (circular).

Normal subjects sometimes exhibit vertical nystagmus, probably of otolithic origin, when supine in darkness. Gaze-evoked nystagmus occurs when a person attempts to hold the eyes in an …

Jul 1, 2025 · Upbeat nystagmus (UBN) is a relatively uncommon neuro-otological finding that clinicians may encounter in patients presenting with vertigo. This phenomenon is closely linked …