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Objective Analysis of Reading Ability Using an Eye Tracker in Intermittent Exotropia.

Dong Hyun Kim1, Jeong-Min Hwang2, Hee Kyung Yang1

  • 1Department of Ophthalmology, Seoul National University College of Medicine, Seoul National University Bundang Hospital, Seongnam 13620, Republic of Korea.

Life (Basel, Switzerland)
|November 27, 2025
PubMed
Summary
This summary is machine-generated.

Patients with intermittent exotropia exhibit slower reading speeds compared to controls. Eye tracker measurements of fixation disparity significantly correlated with reduced reading ability in these patients.

Keywords:
eye trackerintermittent exotropiareading ability

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Area of Science:

  • Ophthalmology
  • Vision Science
  • Clinical Research

Background:

  • Intermittent exotropia is a common strabismus condition.
  • Reading ability can be affected by visual conditions.
  • Objective measurement of reading performance in intermittent exotropia is needed.

Purpose of the Study:

  • To analyze reading ability in patients with intermittent exotropia using eye-tracking technology.
  • To determine the impact of clinical characteristics of intermittent exotropia on reading speed.
  • To compare reading speed between intermittent exotropia patients and normal controls.

Main Methods:

  • Compared reading speed (letters per second) in 25 intermittent exotropia patients and 25 age-matched controls (≥13 years, best-corrected visual acuity ≥20/25).
  • Utilized eye-tracking to measure fixation disparity during reading tasks.
  • Evaluated correlations between reading speed and clinical features of intermittent exotropia.

Main Results:

  • Intermittent exotropia patients demonstrated significantly slower reading speeds (6.1 LPS) than controls (6.8 LPS).
  • Clinical measures like deviation angle did not significantly correlate with reading speed.
  • Fixation disparity scores from eye tracking showed a significant negative correlation with reading speed (r=-0.458, p=0.028).

Conclusions:

  • Reading speed is impaired in individuals with intermittent exotropia compared to controls.
  • Objective fusional control scores, measured via eye tracking, are the primary correlate of reading speed deficits in this population.