why is 20/20 vision considered the standard for good vision? How does the eye differ when people have 20/10 vs 20/200?
In: Biology
The measurement is a comparison between your vision and the vision of the average person, at the baseline distance of 20 feet.
If you have 20/10 vision, it means that you can see something just as sharp from 20 feet away as a normal person would need to be 10 feet away to see. In other words, 20/10 is substantially above-average eyesight.
Whereas, if your eyesight is 20/200, it means that when you’re 20 feet away from something, you can only see it as well as a normal person can see it from 200 feet away. So 20/200 is really bad eyesight.
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