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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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eye sight
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What facial disorder did W H Auden have?
he had sight in only one eye
Was Leonhard Euler blind?
Yes, after getting a deadly fever in 1735 he went blind in one eye, later to have cataract surgery and gain sight back for a few days. But he did not take good car of himself or his eye, and he lost his sight again.
If the mean was six then whats the numbers?
The "mean" of a group of numbers is their "average". It doesn't tell you what the numbers are, or even how many numbers there are.
