Do picture-based charts overestimate visual acuity? Comparison of Kay Pictures, Lea Symbols, HOTV and Keeler logMAR charts with Sloan letters in adults and children

Nicola S Anstice, Robert J Jacobs, Samantha K Simkin, Melissa Thomson, Benjamin Thompson and Andrew V Collins

PLOS ONE, 2017, vol. 12, issue 2, 1-17

Abstract: Purpose: Children may be tested with a variety of visual acuity (VA) charts during their ophthalmic care and differences between charts can complicate the interpretation of VA measurements. This study compared VA measurements across four pediatric charts with Sloan letters and identified chart design features that contributed to inter-chart differences in VA. Methods: VA was determined for right eyes of 25 adults and 17 children (4–9 years of age) using Crowded Kay Pictures, Crowded linear Lea Symbols, Crowded Keeler logMAR, Crowded HOTV and Early Treatment of Diabetic Retinopathy Study (ETDRS) charts in focused and defocused (+1.00 DS optical blur) conditions. In a separate group of 25 adults, we compared the VA from individual Kay Picture optotypes with uncrowded Landolt C VA measurements. Results: Crowded Kay Pictures generated significantly better VA measurements than all other charts in both adults and children (p

Date: 2017
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Persistent link: https://EconPapers.repec.org/RePEc:plo:pone00:0170839

DOI: 10.1371/journal.pone.0170839

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