The acuity tests were administered using a logMAR (minimum angle of resolution) chart based on the ETDRS chart (35) at 99% contrast (display brightness: text, 1 cd/m2; background, 190 cd/m2). One line of five random letters (from the 10 Sloan letters) was shown at a time, with each subsequent line smaller by 0.1 logMAR. This continued until the user identified three or more letters incorrectly within the same line. The final reported acuity was the acuity of that line, minus 0.02 logMAR per letter answered incorrectly during that trial.

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