What does 20 20 Vision Stand for?

When a person has 20/20 vision he or she can see detail from 20 feet away. A person is legally blind when his or her vision is 20/200. That means that in order to see what a normal seeing person sees at 200 feet, the person with 20/200 vision needs to be just 20 feet away to see the same thing. For more information, look here: