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by MyKinKStar on September 18th, 2005

MyKinKStar

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What does the term "20/20" mean?

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  • by Scottythinks on October 18th, 2005

    Scottythinks

    The term 20/20 refers to the "average" or "normal" ability to see (usually judged by print) at 20 feet away. It is NOT a score of 20 out of 20 or "perfect vision". Some people can see 20/15 which is to say that they can see at 20 feet what the "average" person (20/20) could see at 15 feet away. This is somewhat of a "sliding scale" as the average is never a constant per se and the extremes are too difficult to measure. Even within 20/20 vision there can be a significant difference in people’s vision. If you have 20/40 vision you see at 20 feet away what an average person see's at 40 feet away.
    For more info check this sight...Haha.:
    www.agingeye.net/visionbasics/healthyvision.php

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