Related Experiment Video
Updated: May 7, 2026
Testing of all Six Semicircular Canals with Video Head Impulse Test Systems
Published on: April 18, 2019
Evaluation of quantitative head impulse testing using search coils versus video-oculography in older individuals
Yuri Agrawal1, Michael C Schubert, Americo A Migliaccio
1*Department of Otolaryngology-Head and Neck Surgery, and †Department of Neurology, The Johns Hopkins University School of Medicine, Baltimore, Maryland; ‡Neuroscience Research Australia and the University of New South Wales, Sydney, Australia; §German Center for Vertigo and Balance Disorders (IFB LMU), University Hospital Munich, Campus Grosshadern; and ∥Lausitz University of Applied Sciences, Senftenberg, Germany.
Objective:
To evaluate the validity of 2D video-oculography (VOG) compared with scleral search coils for horizontal AVOR gain estimation in older individuals.
Study Design:
Cross-sectional validation study.
Setting:
Tertiary care academic medical center.
Patients:
Six individuals age 70 and older.
Interventions:
Simultaneous eye movement recording with scleral search coil (over right eye) and EyeSeeCam VOG camera (over left eye) during horizontal head impulses.
Main Outcome Measures:
Best estimate search coil and VOG horizontal AVOR gain, presence of compensatory saccades using both eye movement recording techniques.
Results:
We observed a significant correlation between search coil and VOG best estimate horizontal AVOR gain (r = 0.86, p = 0.0002). We evaluated individual head impulses and found that the shapes of the head movement and eye movement traces from the coil and VOG systems were similar. Specific features of eye movements seen in older individuals, including overt and covert corrective saccades and anticompensatory eye movements, were captured by both the search coil and VOG systems.
Conclusion:
These data suggest that VOG is a reasonable proxy for search coil eye movement recording in older subjects to estimate VOR gain and the approximate timing of corrective eye movements. VOG offers advantages over the conventional search coil method; it is portable and easy to use, allowing for quantitative VOR estimation in diverse settings such as a routine office-based practice, at the bedside, and potentially in larger scale population analyses.
