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You tend to have your eyesight tested from 6 meters or 20 feet away from the chart with the letters on it.
If your eyesight is 6/12 (pronounced "six over twelve"), then your eyesight is not quite normal. This is because the letters you can read from 6 meters away can be read by a normal person from 12 meters away. That is, you have to be standing twice as close.
If your eyesight is 6/6 (or 20/20 in feet), you are normal.
If your eyesight is 6/5, you can see from 6 feet what a normal person can only see from 5 meters away. That is, they would have to take a step towards the chart to read these letters.
20/10 would mean that you can see things clearly at 20 feet that an average person can see clearly from 10.
20/20 is the standard for good eyesight.
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