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What is 20/20 vision?

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What is 20/20 vision?

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20/20 vision means a person sees at 20 feet what a “normal” person can see at 20 feet. 20/40 vision means the person is seeing at 20 feet what a normal person should be seeing at 40 feet. In the metric system the same vision is expressed in meters e.g.: 6/6.

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By looking at lots of people, eye doctors have decided what a “normal” human should be able to see when standing 20 feet from an eye chart.

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