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A Brief Explanation of Vision Measurement in the U.S.A.

Here, in the United States, we say that normal vision is 20/20. What this means is that a person can see something 20 feet away that a person with normal vision can see 20 feet away. The first number is the distance from an object for the person who is being tested. The second number is the distance at which a person with normal vision can see something. For example, a sign that a person with normal vision can read at a distance of 400 feet, I can read at a distance of 20 feet.

When I described my vision, I said that I was between 20/400 and 20/600. The reason I am not sure exactly how bad my vision is because the largest letter on the eye chart represents 20/400 vision. I can make out that there is a letter there, but I can't read it. That is why I can't tell you exactly what my vision is.

For more information on vision and what can be done to improve it, write to Memorial Eye Institute at mei4100@epix.net.



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This page last updated on December 12, 1996.