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Detection of VOR dysfunction during the gaze stabilization test: Does target size matter?

Adam Thompson-Harvey1, Charlotte E Dutcher2, Heather A Monroe3

  • 1Department of Otolaryngology and Communication Sciences, Medical College of Wisconsin, Milwaukee, Wisconsin, USA.

Journal of Vestibular Research : Equilibrium & Orientation
|April 26, 2021
PubMed
Summary

The 0.2 ΔlogMAR optotype is superior for detecting vestibulo-ocular reflex (VOR) dysfunction during the Gaze Stabilization Test (GST). This finding aids in diagnosing unilateral vestibular dysfunction and guiding gaze stabilization therapy.

Keywords:
Gaze stabilization testvestibular rehabilitationvestibular testingvestibulo-ocular reflex (VOR)visual acuity

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Area of Science:

  • Ophthalmology
  • Neurology
  • Vestibular System

Background:

  • The Gaze Stabilization Test (GST) assesses vestibulo-ocular reflex (VOR) dysfunction by measuring target recognition decline with head velocity.
  • Optimal optotype size for GST above static visual acuity remains undefined.

Purpose of the Study:

  • Determine the optimal optotype size for the GST in individuals with unilateral vestibular dysfunction (UVD) and healthy controls.
  • Evaluate optotype sizes 0.2 and 0.3 logMAR above static visual acuity (ΔlogMAR).

Main Methods:

  • Eight UVD subjects and 19 healthy controls underwent the standard GST protocol.
  • Maximal head velocity during fixation on 0.2 and 0.3 ΔlogMAR optotypes was recorded.
  • Sensitivity, specificity, and ROC AUC analyses identified optimal head velocity cutoffs.

Main Results:

  • The 0.2 ΔlogMAR optotype showed a significant difference in maximal head velocity between UVD and control groups (p=0.032).
  • 0.2 ΔlogMAR yielded higher sensitivity (75% vs. 63%) and accuracy (86% vs. 80%) in detecting UVD.
  • Positive likelihood ratios were substantially higher for 0.2 ΔlogMAR (10) compared to 0.3 ΔlogMAR (6.3).

Conclusions:

  • The 0.2 ΔlogMAR optotype is significantly more effective for identifying UVD and detecting VOR dysfunction.
  • Using 0.2 ΔlogMAR during GST may improve VOR dysfunction detection and serve as a baseline for rehabilitation therapy.