Abstract
This study compared the Arclight Cloth Chart (ARCchart) to the gold standard ETDRS chart for visual acuity (VA) measurement in 63 participants. Despite its potential limitations as a tool to measure subtle changes in VA over time, the ARCchart showed a limit of agreement between -0.23logMAR and 0.26logMAR with ETDRS values. It demonstrated 93% (95% Confidence Interval 86% to 100%) sensitivity and 90% (84% to 97%) specificity when used to screen for vision worse than 0.20logMAR. This low-cost, portable cloth VA chart is a valuable alternative for measuring VA and screening for low vision in resource poor settings.
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