Contrast reduction and reading: assessment and reliability with the Reading Explorer test

Area of Science:

• Ophthalmology
• Vision Science
• Low Vision Research

Background:

• Text contrast reduction is a common challenge in reading materials.
• Understanding its impact on reading performance is crucial for individuals with visual impairments.

Purpose of the Study:

• To evaluate the reliability of the Reading Explorer (REX) charts.
• To assess how decreased text contrast affects reading speed in people with normal and low vision.

Main Methods:

• Reading speed was measured using REX charts with reduced contrast (1.5 cycle/degree).
• Participants were grouped by visual acuity (logMAR 0.0-1.0).
• Standard visual acuity and contrast sensitivity tests were also performed.

Main Results:

• The REX test demonstrated good reliability for average reading speed and contrast threshold in low-vision groups.
• Approximately one-third of participants with 0.6 logMAR acuity and two-thirds with 1.0 logMAR acuity experienced a 20% reading speed loss with contrast reduction.

Conclusions:

• The negative impact of decreased text contrast on reading performance in low vision is likely underestimated.
• The REX test is a reliable tool for investigating the effects of contrast reduction on reading.