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How People with Low Vision Achieve Magnification in Digital Reading

Granquist, Christina, BS1*; Wu, Yueh-Hsun, MS1; Gage, Rachel, BA1; Crossland, Michael D., PhD, MCOptom2; Legge, Gordon E., PhD1

doi: 10.1097/OPX.0000000000001261

SIGNIFICANCE Digital reading displays provide opportunities for enhancing accessibility of text for low vision. How are these displays used by people in their daily lives?

PURPOSE 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.

METHODS 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.

RESULTS 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 logMAR acuity. Most of the low vision subjects achieved their desirable magnification by a combination of reduced viewing distance and increased physical letter size. The majority (54 of 75) relied more on letter-size magnification. Relative to the controls, regression analysis revealed that a typical low vision subject with logMAR acuity of 1.0 reduced viewing distance by a factor of 2.8 and enlarged physical print size by a factor of 6.

CONCLUSIONS Our survey shows that people with a wide range of acuities are engaged in digital reading. Our subjects achieved desirable magnification primarily by enlarging physical character size and to a lesser extent by reducing viewing distance.

1Department of Psychology, University of Minnesota, Minneapolis, Minnesota

2Moorfields Eye Hospital NHS Foundation Trust, London, United Kingdom *

Submitted: November 9, 2017

Accepted: June 19, 2018

Funding/Support: Foundation for the National Institutes of Health (EY002934; to GEL).

Conflict of Interest Disclosure: None of the authors have reported a financial conflict of interest.

Author Contributions and Acknowledgments: Conceptualization: CG, MDC, GEL; Data Curation: CG, RG; Formal Analysis: CG, Y-HW; Funding Acquisition: GEL; Investigation: CG, Y-HW, GEL; Methodology: CG, MDC, GEL; Project Administration: CG, GEL; Resources: GEL; Supervision: GEL; Validation: CG, Y-HW, GEL; Visualization: CG, Y-HW, MDC, GEL; Writing – Original Draft: CG; Writing – Review & Editing: Y-HW, RG, MDC, GEL.

The authors thank Andrew Sell and Thomas Lindsay of the Liberal Arts Technologies and Innovation Services at the University of Minnesota, Elaine Kitchel of the American Printing House for the Blind, and their fellow laboratory members of the Minnesota Laboratory for Low Vision Research.

© 2018 American Academy of Optometry