2015 vision. 2020 is not the best possible eyesight however for example 2015. If you have 2015 vision you can see a line in the eye. 66 is the visual acuity needed to. My vision is 2015 how raregood is this.
A person with 2015 vision can see an object from 20 feet away with the same acuity as a normal person would at 15 feet away. In optometry 2015 vision is considered to be above average in terms of eye sight. Technically then a person with 2015. By most metrics 2015 is the best vision rating that a person can receive and is.
I was always of the understanding that it was not. Healthy eyes are capable of identifying at least some of the letters on the 2015. However 2020 vision is not perfect vision. A person with 2020 vision is able to see letters 110th as large as someone with 20200 vision.
So it is inaccurate to refer to 66 visual acuity as perfect vision. Emmetropic subjects with 66 vision or better 2015. A person can have 2015 vision which is sharper than average. It is rare enough that growing up i was aware of things that most people thought i was too far away to have been watching.
Fighter pilots often usually have 2010. Only 1 of people have 2010 vision yet it can be attained. My wife is under the impression that 2015 means one is far sighted instead of nearsighted.