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Related Experiment Video

Updated: May 12, 2025

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Quantitative analysis of ocular deviation under eye occlusion: a descriptive study using the ORTe EYENAC eye-tracking

Shunya Tatara1, Yuna Magara2,3, Touko Sasaki2,4

  • 1Department of Orthoptics and Visual Sciences, Niigata University of Health and Welfare, Niigata, Japan. tatara@nuhw.ac.jp.

BMC Ophthalmology
|May 6, 2025
PubMed
Summary

Video-oculography with the ORTe EYENAC system effectively visualizes ocular deviation during occlusion in individuals with exodeviation. Stabilization time for fusion-free eye position averaged 3.33 seconds, varying with deviation angle.

Keywords:
Cover testDeviation speedDeviation stabilizationExophoriaEye-trackingORTe EYENACOcular deviationVideo-oculography

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Area of Science:

  • Ophthalmology
  • Vision Science
  • Biomedical Engineering

Background:

  • Traditional cover tests for heterotropia and heterophoria are qualitative or time-consuming.
  • Alternate prism cover test (APCT) quantifies ocular deviations but has interexaminer variability.
  • Video-oculography offers a promising, objective method for quantifying ocular deviation under occlusion.

Purpose of the Study:

  • To visualize ocular deviation during occlusion using the ORTe EYENAC eye-tracking system.
  • To determine the stabilization time of ocular deviation in participants with exodeviation.

Main Methods:

  • 15 university students (aged 20-22) with exodeviation participated.
  • Eye position was measured using the ORTe EYENAC during monocular occlusion.
  • Data were fitted to a logistic function to estimate deviation, speed, and stabilization time.

Main Results:

  • Fusion-free eye position stabilized at 3.33 ± 2.39 seconds in participants with exophoria.
  • Significant correlations were found between deviation angle and speed (rs = -0.582), and angle and stabilization time (rs = 0.663).
  • Overshoot depth correlated significantly with deviation speed (rs = 0.775).

Conclusions:

  • The ORTe EYENAC system effectively visualizes ocular deviation under occlusion in exodeviation.
  • Stabilization time varied with the angle of ocular deviation.
  • Occlusion duration should be individualized based on the specific angle of strabismus.