Rotary beating with no horizontal or vertical component — central.
Live · Primary gaze
Stylised teaching animation, exaggerated for visibility — not a recording of a real patient, and not a diagnosis.
Localises toCentral
Bedside testPrimary gaze
Fast phaseTorsional
Reading
The fast phase is purely rotary — the iris markings turn, but the eye does not drift horizontally or vertically. Isolated torsional nystagmus is a brainstem sign; it can be the ONLY abnormal finding in an otherwise reassuring-looking exam, so look for it deliberately.
Stylised teaching animations authored by NeuroDash. Not real-patient recordings, not board-certified, and not reviewed by an outside specialist. Educational only — not medical advice and not a diagnosis.