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A Gaze-Contingent Display Framework for Perceptual Learning Research with Simulated Central Vision Loss
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Published on: April 11, 2025

Text accessibility by people with reduced contrast sensitivity.

Michael D Crossland1, Gary S Rubin

  • 1UCL Institute of Ophthalmology, London, UK. m.crossland@ucl.ac.uk

Optometry and Vision Science : Official Publication of the American Academy of Optometry
|July 31, 2012
PubMed
Summary

Older adults often have reduced contrast sensitivity, impacting reading. High-contrast digital text, like on LED monitors, improves readability for most, though optimal fluency may still be a challenge.

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Area of Science:

  • Ophthalmology
  • Human Factors
  • Gerontology

Background:

  • Contrast sensitivity is crucial for reading and declines with age and eye disease.
  • Older adults represent a significant population experiencing age-related visual changes.

Purpose of the Study:

  • To compare text contrast in print and digital formats against the contrast sensitivity of older adults.
  • To assess the readability of various text formats for individuals aged 65-84.

Main Methods:

  • Assessed contrast sensitivity in 2520 adults (65-84 years) from the Salisbury Eye Evaluation.
  • Calculated the proportion unable to read different text formats (e-books, newsprint, monitors) based on contrast reserve levels.

Main Results:

  • One percent of participants struggled to read newsprint fluently.
  • LED computer monitors offered the highest text contrast, with 98% achieving high-fluent reading speeds.
  • 29.6% of participants were unlikely to achieve optimal reading fluency on monitors.

Conclusions:

  • Low print contrast limits text accessibility for many.
  • High-contrast formats, like laser print on white paper, enhance information access.
  • Digital text optimized for LED monitors significantly improves document accessibility for older adults.