Below is an image called the “Snellen Eye Test”. Want to test your vision RIGHT NOW? Cool. If you have 20/10 vision, you can see at 20 feet, what a normal person can see at 10 feet from an eye chart.
If you have 20/10 vision you are above average! You are better than the “normal” person and you have better than what is considered to be standard or normal, vision. The reverse applies if you have 20/10 vision. To clarify this further, if you have 20/40 vision, and there is a normal person standing 40 feet from the chart and you are standing 20 feet from the chart, you both see the same amount of detail on the eye chart. So if you have 20/40 vision, this means that you can see only as good as a normal person can see at 40 feet away from an eye chart. So a legally blind person needs a distance of two feet to spot the letters on a standard eye chart that is 20 feet away.* The American Optometric Association states that a person with 20/20 vision can clearly identify a row of 9mm letters from 20 feet.ĭid you know that to be considered legally blind (and also unable to drive a vehicle) in the U.S., your vision is as bad as 20/200? A legally blind person with vision of 20/200 has to be as close as 20 feet to identify objects that people with normal vision can spot from 200 feet. This means, that when you stand 20 feet away from an eye chart, you see what the normal person should see. 20/20 vision is referred to as the standard, or how a “normal” person sees.
Optometrists and ophthalmologists around the world, have discovered the standard by which every person should be judged, when diagnosing their vision status.
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