Journal of Rehabilitation Research & Development (JRRD)

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Volume 50 Number 10, 2013
   Pages 1343 — 1352

Abstract — Evaluating Barten image metric for predicting character recognition in people with low vision

Kimberly A. Schoessow, OTD, OTR/L;1–2 Lisa M. Mauney, MS;1 Mark Uslan, MS;3 Ronald A. Schuchard, PhD1,4*

1Rehabilitation Research and Development, Department of Veterans Affairs Palo Alto Health Care System, Palo Alto, CA; 2The Frank Stein and Paul S. May Center for Low Vision Rehabilitation at California Pacific Medical Center, San Francisco CA; 3AFB Tech, American Foundation for the Blind, Huntington, WV; 4Department of Neurosurgery, Stanford University School of Medicine, Stanford, CA

Abstract — Electronic devices with small visual displays (SVDs) are often inaccessible to the millions of Americans with vision loss. The Barten square root integral (SQRI) is an image quality metric that has been shown to predict whether people with normal vision can see images on a cathode ray tube monitor. The present proof-of-concept study begins to explore whether the same metric could predict the ability of users with low vision to see images on SVDs. In a sample population of 33 adults with low vision, the Barten SQRI was the best predictor of the ability to recognize low-contrast single digits on a screen (r2 = 0.80, p < 0.01), followed by the Pelli-Robson Contrast Sensitivity Chart (r2 = 0.69, p < 0.01). Visual acuity was not significantly predictive of the ability to read low-contrast characters on a display. Further work will explore whether the Barten SQRI remains predictive of the ability of people with low vision to use actual devices that have SVDs.

Key words: accessibility, contrast sensitivity, image metric, low vision, modulation transfer function, reading, resolution, small visual displays, universal design, vision rehabilitation.


View HTML  ¦  View PDF  ¦  Contents Vol. 50, No.10
This article and any supplementary material should be cited as follows:
Schoessow KA, Mauney LM, Uslan M, Schuchard RA. Evaluating Barten image metric for predicting character recognition in people with low vision. J Rehabil Res Dev. 2013;50(10):1343–52.
http://dx.doi.org/10.1682/JRRD.2012.09.0164
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