New visual acuity charts for clinical research

Am J Ophthalmol. 1982 Jul;94(1):91-6.


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.

MeSH terms

  • Humans
  • Research
  • Vision Tests / instrumentation*
  • Visual Acuity*