What is the best eye sight number?

Answer 1

20/20 is "normal" vision. Some people have greater visual acuity, and their vision may measure 20/16, 20/12, or 20/10. A very few people may have greater than 20/10, but there is no standard measurement for that.

Answer 2

The best human vision is 20/10. This is the minimal spatial resolution that individual photoreceptor cells on your retina can detect.