Standardizing the measurement of visual acuity for clinical research studies: Guidelines from the Eye Care Technology Forum.
Ferris
F L
FL
Clinical Trials Branch, National Institutes of Health, Bethesda, MD 20892, USA.
Bailey
I
I
D015510:Clinical Medicine / Q000592:standards*; D006801:Humans; D009316:National Institutes of Health (U.S.); D012015:Reference Standards; D012106:Research / Q000592:standards*; D014481:United States; D014792:Visual Acuity