THE ENG BATTERY. ENG & VNG. http://medlib.med.utah.edu/neuroophth/. Calibration and Gaze testing. Pt. asked to gaze at visual targets. At known angles to calibrate voltage per ° of eye movement Extraneous eye movements are recorded Spontaneous and/or gaze nystagmi may be observed
Linear slow phase
Visual Fixation Inhibits
Horiz, Vert, or Obl.
Sing, Dual, or Mult
Linear or Exponent
Conj, or disconj.
NoVis. inhibitionPeripheral Vs. Central
declines quickly (within days to a couple of weeks)
Alexander's Law:1st degree Nystagmus: present only on lat. gaze2nd deg: both on center and lat. side of beat3rd deg: on center, and both lateral gazes.Peripheral Gaze Nystagmus:
> 0.60 = Lack of fixation: CNS lesion.
*(speed with eyes closed just prior to eyes open)