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Today, we discuss visual acuity using the Snellen chart. Learn how to set it up and understand what the numbers mean. Find out when it's important to see an eye doctor. To set up the Snellen chart, find a well-lit area and measure 20 feet back for the patient to stand. The chart's height should be 64 inches to the 20/20 line. Point to different areas on the chart and ask the patient to read the line you indicate.