Automated determination of distance visual acuity: towards teleophthalmology services |
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| Authors: | Sajeesh Kumar PhD Max Bulsara PhD Kanagasingam Yogesan PhD |
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| Affiliation: | 1. Centre of Excellence in e‐Medicine, Lions Eye Institute, University of Western Australia, Nedlands WA, Australia;2. School of Population Health, University of Western Australia, Nedlands WA, Australia
E‐mail: sajeesh@cyllene.uwa.edu.au |
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| Abstract: | Purpose: The aim of this study was to evaluate the visual acuity scores of a computer‐based visual function testing (CVFT) system. The automated chart uses logMAR notation (logarithm of the minimum angle of resolution) and randomised tilting E as optotype. The test was conducted using a laptop computer. Methods: This prospective, clinic‐based, test validation study was based on a model of repeatability in two observations. The right eyes of a total of 104 participants were randomly tested with both CVFT and the manual, gold standard Early Treatment of Diabetic Retinopathy Study (ETDRS) chart. Results: The mean difference between CVFT and ETDRS was ‐0.01 ± 0.11 (SD) logMAR units. The Spearman Rank correlation coefficient (r) between the absolute difference and the average was 0.35. The average time for testing one eye was 54.7 ± 11.89 seconds. The mean difference between two consecutive, repeated CVFT tests in the same eye was 0.02 ± 0.07 logMAR units (paired t‐test p = 0.046). Conclusions: A novel, automated visual acuity testing application is reported. This automated system should be a useful tool for mass screening of visual impairment in rural and remote regions with its ease of use and shorter testing time. |
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| Keywords: | computerised eye testing teleophthalmology visual acuity |
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