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Related Experiment Video

Updated: Feb 16, 2026

Using Eye-tracking to Assess the Relative Importance of Visual and Vestibular Input to Subcortical Motion Processing in the Roll Plane
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Using Eye-tracking to Assess the Relative Importance of Visual and Vestibular Input to Subcortical Motion Processing in the Roll Plane

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Are Covert Saccade Functionally Relevant in Vestibular Hypofunction?

R Hermann1,2,3, D Pelisson2,3, O Dumas4

  • 1Hospices Civils de Lyon, ENT, Cervico-Facial Surgery and Audiophonology, Hôpital Edouard Herriot, Lyon, France.

Cerebellum (London, England)
|December 18, 2017
PubMed
Summary
This summary is machine-generated.

Patients with vestibular hypofunction use covert saccades to maintain vision during head movements. Higher frequency and gain of these saccades, with shorter latency, improve dynamic visual acuity, suggesting targeted rehabilitation.

Keywords:
Bilateral vestibulopathyDynamic visual acuityEye movement recordHead impulse testOscillopsiaVestibular areflexia

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Area of Science:

  • Neuroscience
  • Ophthalmology
  • Vestibular System

Background:

  • The vestibulo-ocular reflex (VOR) stabilizes gaze during head movements, crucial for dynamic visual acuity.
  • Bilateral vestibular hypofunction impairs VOR, leading patients to use saccades, including covert saccades, for visual compensation.
  • Covert saccades occur during head displacement, but their role in maintaining dynamic visual acuity is not fully understood.

Purpose of the Study:

  • To investigate if covert saccades improve dynamic visual acuity in patients with bilateral vestibular hypofunction.
  • To identify which characteristics of covert saccades are most relevant for enhancing visual function.

Main Methods:

  • Prospective study of 18 patients with chronic bilateral vestibular hypofunction.
  • Evaluation of dynamic visual acuity and video recording of head/eye movements during horizontal head impulse tests.
  • Calculation of saccade frequency, latency, consistency, gain, and residual VOR gain.

Main Results:

  • No correlation found between residual VOR gain and dynamic visual acuity.
  • Dynamic visual acuity positively correlated with covert saccade frequency and gain.
  • Dynamic visual acuity negatively correlated with covert saccade latency; consistency showed no correlation.

Conclusions:

  • Covert saccades, despite short gaze stabilization duration, appear to improve vision during angular head impulses in vestibular hypofunction.
  • Findings support the need for rehabilitation strategies that promote covert saccade triggering.
  • The study discusses the physiological origins of covert saccades in this context.