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Eye movements and reading with simulated visual impairment

A R Bowers1, V M Reid

  • 1Department of Vision Sciences, Glasgow Caledonian University, UK.

Ophthalmic & Physiological Optics : the Journal of the British College of Ophthalmic Opticians (Optometrists)
|December 9, 1997
PubMed
Summary

Simulated visual impairment significantly slows reading speed by increasing fixation times and saccade frequency. Optimal reading requires print size four times acuity threshold and contrast twenty times threshold.

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Area of Science:

  • Ophthalmology
  • Visual Science
  • Human Factors

Background:

  • Reading speed is crucial for information acquisition.
  • Visual impairment can significantly impact reading performance.
  • Understanding the effects of visual impairment on reading is essential for developing effective visual aids and strategies.

Purpose of the Study:

  • To investigate the impact of simulated visual impairment on reading speed.
  • To analyze changes in reading eye movements under simulated visual impairment.
  • To determine optimal print size and contrast for reading under impaired visual conditions.

Main Methods:

  • Utilized afocal diffusing filters (Ryser occlusion foils) to simulate visual impairment at three distinct levels.
  • Employed a spectacle-mounted, infra-red limbal reflection system to record eye movements during reading tasks.

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  • Measured reading speed and analyzed parameters of reading eye movements, including fixation duration and saccade characteristics.

    • Main Results:

    • A significant decrease in reading speed was observed as the level of simulated visual impairment increased (P < 0.01).
    • Key factors contributing to reduced reading speed included prolonged fixation durations and shorter saccades, leading to more forward saccades per line.
    • Increased time for page navigation was also identified as a contributing factor to slower reading.

    Conclusions:

    • Simulated visual impairment adversely affects reading speed and eye movement patterns in normally-sighted individuals.
    • Print size should be at least four times the acuity threshold for optimal reading.
    • Print contrast should be at least twenty times the contrast threshold to ensure efficient reading, even with mild visual impairment.