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
THE ENG BATTERY
Linear slow phase
Visual Fixation Inhibits
Horiz, Vert, or Obl.
Sing, Dual, or Mult
Linear or Exponent
Conj, or disconj.
strongest on gaze in direction of beating
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.
> 0.60 = Lack of fixation: CNS lesion.
*(speed with eyes closed just prior to eyes open)