Step 1 : Introduction to the question "Used to test vision, the Snellen eye chart typically has what single letter in the top row?"
A Snellen chart is an eye chart that can be used to measure visual acuity. Snellen charts are named after the Dutch ophthalmologist Herman Snellen who developed the chart in 1862.[1] Many ophthalmologists and vision scientists now use an improved chart known as the LogMAR chart.
Step 2 : Answer to the question "Used to test vision, the Snellen eye chart typically has what single letter in the top row?"
E: Used to test vision, the Snellen eye chart typically has single letter 'E' in the top row
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