Comparing performance on the MNREAD iPad application with the MNREAD acuity chart

Aurélie Calabrèse, Long To, Yingchen He, Elizabeth Berkholtz, Paymon Rafianm, Gordon E. Legge

Research output: Contribution to journalArticlepeer-review

12 Scopus citations


Our purpose was to compare reading performance measured with the MNREAD Acuity Chart and an iPad application (app) version of the same test for both normally sighted and low-vision participants. Our methods included 165 participants with normal vision and 43 participants with low vision tested on the standard printed MNREAD and on the iPad app version of the test. Maximum Reading Speed, Critical Print Size, Reading Acuity, and Reading Accessibility Index were compared using linear mixed-effects models to identify any potential differences in test performance between the printed chart and the iPad app. Our results showed the following: For normal vision, chart and iPad yield similar estimates of Critical Print Size and Reading Acuity. The iPad provides significantly slower estimates of Maximum Reading Speed than the chart, with a greater difference for faster readers. The difference was on average 3% at 100 words per minute (wpm), 6% at 150 wpm, 9% at 200 wpm, and 12% at 250 wpm. For low vision, Maximum Reading Speed, Reading Accessibility Index, and Critical Print Size are equivalent on the iPad and chart. Only the Reading Acuity is significantly smaller (I. E., better) when measured on the digital version of the test, but by only 0.03 logMAR (p=0.013). Our conclusions were that, overall, MNREAD parameters measured with the printed chart and the iPad app are very similar. The difference found in Maximum Reading Speed for the normally sighted participants can be explained by differences in the method for timing the reading trials.

Original languageEnglish (US)
Article number8
JournalJournal of vision
Issue number1
StatePublished - Jan 1 2018

Bibliographical note

Funding Information:
The authors would like to thank J. Stephen Mansfield and Charles Bigelow for their work on the MNREAD iPad app development, as well as Michael Crossland for his guiding comments during the app development process. The authors would also like to thank the researchers and clinicians who agreed to test the beta version of the app, providing helpful feedback and suggestions during the debug process. This work was supported by the National Institutes of Health (grant EY002934).

Publisher Copyright:
© 2018 The Authors.


  • IPad
  • Low vision
  • Normal vision
  • Reading test


Dive into the research topics of 'Comparing performance on the MNREAD iPad application with the MNREAD acuity chart'. Together they form a unique fingerprint.

Cite this