Divergent nystagmus: recordings from an advanced system of infra-red oculography.
Because of some limitations in photoelectric nystagmography, a new system of binocular infra-red oculography (BIRO) was developed. The advantages of BIRO are excellent linearity up to +/- 20 degrees horizontal eye movement, sensitivity of at least 0.1 degree of eye movement and the possibility of obtaining binocular recordings. In the course of a routine clinical evaluation, divergent nystagmus was recorded in 2 patients. This occurred both spontaneously and following caloric stimulation. A vascular brain stem pathology was strongly suspected from magnetic resonance imaging (MRI) studies. The possible mechanisms of divergent nystagmus are discussed.
Department of Otolaryngology--Head & Neck Surgery, University of Illinois, Chicago 60612.
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Kumar
D001921:Brain / Q000033:anatomy & histology; D001933:Brain Stem / Q000502:physiology; D002150:Caloric Tests; D004584:Electronystagmography / Q000379:methods*; D005133:Eye Movements / Q000502:physiology; D005260:Female; D006801:Humans; D007259:Infrared Rays; D008279:Magnetic Resonance Imaging; D008875:Middle Aged; D009760:Nystagmus, Physiologic / Q000502:physiology*