Medically reviewed by Johnstone M. Kim, MD The term "20/20 vision" refers to how sharp your eyes are when you look at a standard eye chart (Snellen chart) from a distance of 20 feet (or 6 meters ...

If one eye is seeing 20/200 or less, the other eye must be 20/40 or better to pass the eye test. People are considered as legally blind when their corrected vision in both eyes is 20/200 or less.

So, if you take someone with 20/20 vision and put them 200 feet away from the chart, they would still be able to see the big E clearly. 20/200 visual acuity and worse is considered legally blind ...

20/20 vision is the general standard that corrective measures try to achieve. However, an individual can have a worse vision or better vision. Learn more here.

Most eye charts go to only 20-15 and stop there. The averagemajor-league baseball player, in the experience of Red Soxophthalmology consultant Daniel Laby, has vision that measuresaround 20-12 or ...

This standard of acuity measurement dates back to 1862, when a Dutch ophthalmologist, Herman Snellen, developed a vision chart to measure vision from a distance of 20 feet, or six metres.