system
Given the following post, respond as if you're commenting on Reddit:
human
Why do optometrists only correct my vision to 20/20?  Is it possible to have glasses that give me 20/10 vision?

If so, why not just give us the best vision possible?  Cost?
gpt
the cones in the back of your eye have a finite size.  this is the limiting factor eventually if you make the image any better, and this usually occurs in the 20/20-20/10 region. 

it is like taking a 5MP camera and putting really good lenses in it.  you still won't ever get better than 5MP of data per image.