All About the Snellen Eye Chart - All About Vision
https://www.allaboutvision.com/eye-care/eye-exams/snellen-eye-chart/
WEBOct 12, 2021 · The Snellen eye chart is the most common method used by eye doctors to measure visual acuity, which is how clearly a person can see. During an eye exam, patients will read the Snellen chart from 20 feet away. The farther down the chart the patient can read, the better their visual acuity is. What is the Snellen chart?
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