New visual acuity charts for clinical research.
Three new visual acuity charts facilitate quantitative use of visual acuity test results. The charts have high-contrast lettering on washable white polystyrene. Each line has five Sloan letters; the lines are of equal difficulty and there is a geometric progression in letter size from line to line. This provides a similar task for each line on the chart with the letter size being the only variable. Charts with different letter sequences are used for testing right and left eyes.
D006801:Humans; D012106:Research; D014787:Vision Tests / Q000295:instrumentation*; D014792:Visual Acuity