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Visual Acuity

Learn more... Read the TFOS Dry Eye Workshop Report: http://www.tearfilm.org/tearfilm-repo... Visual Acuity (EDTRS -- measurement of visual acuity). The EDTRS or Early Treatment Diabetic Retinopathy Study method for measuring visual acuity was developed by Ferris et al. in 1982 and uses modified Bailey and Lovie (1976) logMAR charts. This displays limited number of Sloane letters at high contrast selected for their visibility, diminishing in size from row to row in logarithmic steps. As there are five letters in each row, the line length decreases with diminishing letter size giving the chart a distinctive V-shaped pattern. On this chart, the Snellen equivalent of each line is indicated opposite the logMAR value. The method is highly standardized and has been adopted generally for vision research.