How People with Low Vision Achieve Magnification in Digital Reading

Optometry and Vision Science : Official Publication of the American Academy of Optometry
Christina GranquistG E Legge

Abstract

Digital reading displays provide opportunities for enhancing accessibility of text for low vision. How are these displays used by people in their daily lives? Subjects responded to an online survey concerning their vision history, reading technology, display preferences, and reading habits. Here, we report on findings concerning acuity and magnification. The survey asked subjects to arrange a text passage for typical reading and to report viewing distance, screen dimensions, and the number of characters per line. Seventy-five adult subjects (most with early-onset low vision, few with central field loss) completed all survey questions relevant to the analysis of acuity and magnification. Mean acuity was .92 logMAR (range, 0.1 to 1.6), and mean age was 44.8 years (range, 18 to 71 years). Twelve normally sighted controls reported the same information while viewing the passage on cell phones, tablets, and computers. The controls had a mean viewing distance of 38.7 cm and a mean x-height of 1.38 mm. For all three types of devices, angular x-height was 0.21° (close to laboratory estimates of the critical print size for reading). Low vision subjects showed decreasing viewing distance and increasing print size with larger values of log...Continue Reading

References

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Citations

Sep 1, 2018·Optometry and Vision Science : Official Publication of the American Academy of Optometry·Bradley Dougherty
Apr 19, 2020·Optometry and Vision Science : Official Publication of the American Academy of Optometry·Yueh-Hsun WuGordon E Legge
Jun 2, 2020·Disability and Rehabilitation. Assistive Technology·Melanie Fried-OkenBruce Wojciechowski
Nov 11, 2020·Proceedings of the National Academy of Sciences of the United States of America·Nilsu AtilganGordon E Legge
Jan 8, 2021·JAMA Ophthalmology·Michael D CrosslandPeter B M Thomas

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