Jun. 12, 2011
Nystagmus are best viewed using infrared videonystagmography, however, other techniques can partially reduce visual fixation known to suppress vestibular nystagmus. Alternative viewing techniques include Frenzel’s glasses or direct observation assisted by a penlight, otoscope, or ophthalmoscope. Observation Techniques Compared Guidetti, Monzani, and Rovatti (2006) compared three observation techniques (direct visual observation, Frenzel’s glasses and infra-red assisted videonystagmography) used in the examination