<prompt> True about central nystagmus isChanging directionNot suppressed by optic fixationHorizontal or veicalAll of the above  <response>: Nystagmus is central when the lesion is in the central neural pathways. It cannot be suppressed by optic fixation. The direction of nystagmus is changing and is non-fatiguable. Ref: Diseases of EAR, NOSE AND THROAT by PL DHINGRA - 6th Edition 