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Characteristics of horizontal saccades in children with intermittent exotropia

Miharu Mihara1, Ken Kakeue1, Ryoi Tamura2

  • 1Department of Ophthalmology, Graduate School of Medicine and Pharmaceutical Sciences, University of Toyama.

Journal of AAPOS : the Official Publication of the American Association for Pediatric Ophthalmology and Strabismus
|November 11, 2024
PubMed

Insights

Children with intermittent exotropia (IXT) and healthy children show adduction saccade dominance. This dominance is less pronounced in children with IXT, indicating subtle differences in eye movement control.

Area of Science:

  • Ophthalmology
  • Pediatric Ophthalmology
  • Neuroscience

Background:

  • Intermittent exotropia (IXT) is a common childhood strabismus characterized by outward turning of the eyes.
  • Saccadic eye movements are crucial for visual function, and their analysis can reveal underlying neurological or ocular motor control deficits.
  • Understanding saccadic characteristics in IXT may provide insights into the condition's pathophysiology.

Purpose of the Study:

  • To analyze the peak velocity and gain of horizontal saccades in children with IXT.
  • To compare saccadic parameters between children with IXT and age-matched controls without strabismus.

Main Methods:

  • Participants included children aged 12 years or younger with IXT and healthy controls.
  • Horizontal saccades were recorded using an eye tracker.
  • Peak velocity and gain of adduction and abduction saccades were analyzed.

Main Results:

  • The study included 48 children (38 with IXT).
  • Children with IXT showed angles of deviation around 30Δ at near and distance.
  • While both groups exhibited a trend towards greater adduction than abduction saccade velocity and gain, this was less significant in the IXT group.

Conclusions:

  • A dominance of adduction saccades was observed in both children with IXT and controls.
  • This adduction dominance was weaker in children diagnosed with intermittent exotropia.
  • Saccadic analysis may reveal subtle ocular motor control differences in IXT.
Abstract

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