The Snellen eye chart, designed by Dutch ophthalmologist Hermann Snellen in 1862, is one of the most well-known graphs used to measure visual acuity. During an eye exam, one eye is covered and the patient is asked to read aloud the letters in each row of the chart, starting from the top. The 20/40 line on an eye chart is the line that a person must be able to read most of the letters from in order to get an unrestricted driver's license in most states, including Ohio. It is important to note that a full eye exam is always recommended as the Snellen eye chart alone may not detect near vision problems or other vision and eye health issues.
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