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Reading eye movements among homonymous hemianopia.

Nayan Gupta1, Ayisha Atiya, Jameel R Hussaindeen

  • 1Neuro-Optometry Clinic, A Unit of Medical Research Foundation, Sankara Nethralaya, Chennai, Tamil Nadu, India.

Indian Journal of Ophthalmology
|September 19, 2024
PubMed
Summary

Reading eye movements are significantly impaired in individuals with homonymous hemianopia, showing more fixations and regressions, and a slower reading speed compared to controls.

Keywords:
Eye movementsReadAlyzerhomonymous hemianopiasaccades

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Area of Science:

  • Neuro-optometry
  • Ophthalmology
  • Visual Neuroscience

Background:

  • Homonymous hemianopia is a visual field defect affecting half of the visual field.
  • Reading is a complex visual task that relies on precise eye movements.
  • Oculomotor dysfunction can significantly impact reading ability.

Purpose of the Study:

  • To measure reading eye movement parameters in homonymous hemianopia patients.
  • To quantify oculomotor dysfunction in homonymous hemianopia.
  • To compare reading eye movements between homonymous hemianopia patients and age-matched controls using ReadAlyzer.

Main Methods:

  • Prospective study conducted in a tertiary eye care hospital.
  • Fifty patients with homonymous hemianopia and age-matched controls were enrolled.
  • Reading eye movements were recorded and analyzed using the ReadAlyzer system.

Main Results:

  • Homonymous hemianopia patients exhibited more fixations/100 words (175 vs. 91) and regressions/100 words (33 vs. 18).
  • Reading rate was significantly reduced in hemianopia patients (93 words/min vs. 186 words/min).
  • Impairments were also noted in grade level equivalent and regression to fixation ratio.

Conclusions:

  • Reading eye movements are significantly impaired in individuals with homonymous hemianopia.
  • ReadAlyzer effectively quantifies oculomotor dysfunction in this patient group.
  • Findings highlight the impact of homonymous hemianopia on reading performance.