Automated determination of distance visual acuity

Towards teleophthalmology services

Sajeesh Kumar Kamala Raghavan, Max Bulsara, Kanagasingam Yogesan

Research output: Contribution to journalArticle

4 Citations (Scopus)

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.

Original languageEnglish (US)
Pages (from-to)545-550
Number of pages6
JournalClinical and Experimental Optometry
Volume91
Issue number6
DOIs
StatePublished - Nov 1 2008

Fingerprint

Visual Acuity
Diabetic Retinopathy
Mass Screening
Validation Studies
Vision Disorders
Nonparametric Statistics

All Science Journal Classification (ASJC) codes

  • Ophthalmology
  • Optometry

Cite this

Automated determination of distance visual acuity : Towards teleophthalmology services. / Kamala Raghavan, Sajeesh Kumar; Bulsara, Max; Yogesan, Kanagasingam.

In: Clinical and Experimental Optometry, Vol. 91, No. 6, 01.11.2008, p. 545-550.

Research output: Contribution to journalArticle

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