[Ans] Used to test vision, the Snellen eye chart typically has what single letter in the top row?



​ 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