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The amblyopia treatment study visual acuity testing protocol.

J M Holmes·R W Beck·M X Repka·D A Leske·R T Kraker·R C Blair·P S Moke·E E Birch·R A Saunders·R W Hertle·G E Quinn·K A Simons·J M Miller·Pediatric Eye Disease Investigator Group
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Abstract

OBJECTIVE: To evaluate the reliability of a new visual acuity testing protocol for children using isolated surrounded HOTV optotypes. METHODS: After initial pilot testing and modification, the protocol was evaluated using the Baylor-Video Acuity Tester (BVAT) to present isolated surrounded HOTV optotypes. At 6 sites, the protocol was evaluated for testability in 178 children aged 2 to 7 years and for reliability in a subset of 88 children. Twenty-eight percent of the 178 children were classified as having amblyopia. RESULTS: Using the modified protocol, testability ranged from 24% in 2-year-olds to 96% in 5- to 7-year-olds. Test-retest reliability was high (r = 0.82), with 93% of retest scores within 0.1 logMAR unit of the initial test score. The 95% confidence interval for an acuity score was calculated to be the score +/-0.125 logMAR unit. For a change between 2 acuity scores, the 95% confidence interval was the difference +/-0.18 logMAR unit. CONCLUSIONS: The visual acuity protocol had a high level of testability in 3- to 7-year-olds and excellent test-retest reliability. The protocol has been incorporated into the multicenter Amblyopia Treatment Study and has wide potential application for standardizing visual acuity testing in children.

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AmblyopiaAtropineChildChild, PreschoolHumansMydriaticsReproducibility of ResultsSensory DeprivationVision TestsVisual AcuityClinical TrialJournal ArticleMulticenter StudyRandomized Controlled TrialResearch Support, Non-U.S. Gov'tResearch Support, U.S. Gov't, P.H.S.

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J M Holmes, R W Beck, M X Repka, D A Leske, R T Kraker, R C Blair, P S Moke, E E Birch, R A Saunders, R W Hertle, G E Quinn, K A Simons, J M Miller, Pediatric Eye Disease Investigator Group. 2001. The amblyopia treatment study visual acuity testing protocol.. https://doi.org/10.1001/archopht.119.9.1345

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