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Eye charts are often electronic and measure your depth perception. Even if you memorized the chart, it would not help you see on the road. Also the DMV does not use the same eye chart for each customer - they change those at random for obvious reasons.
It is because the letters makes The Eye reflect back into the chart
My wife would memorize the letters of the Snelling eye chart.
During an eye exam, the doctor asked the patient to read the letters on the sixth line of the chart.
An eye examination that determines sharpness of vision, typically performed by identifying objects and/or letters on an eye chart
When Dr. Spyglass gives you an eye exam, he points to letters on the chart. Each time, pick the symbol that points the OPPOSITE way (backward E instead of E, M instead of W) so that you get all of the answers wrong. This shows him that you are a friendly spy.
Typically, the eye chart is the Snellen chart.
If you are referring to Snelen Eye chart it is very easy. all you have to do is to put the snelen eye chart on the wall, walk 20ft away from the chart then read it with your left eye closed then followed by your right eye.
It reduces the distance needed for a 6m/20ft chart into a 3m/10ft distance. Not many rooms are big enough
Read chart Blink Cover one eye
Truman
This is done most easily by use of an eye chart ... you know, the one with the big E, followed by progressively smaller fonts as you read downwards.