Visual Acuity Charts for Clinical Research

Abstract

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. A method of scoring visual acuity using these charts has been developed.

• visual acuity
• visual acuity examination
• visual acuity charts