Quote Originally Posted by bipper View Post
Yeah, 20/20 is just normal. This means you can sit 20 feet away from an eye chart and see what a normal human would see.

so at 20/17 you can stand 20 feet from the chart, and see what a normal person sees at 17 feet from the chart.

It is very crude.
Ah, that's how it works. Despite having abysmal vision since I was young, I never got around to learning just how the number system works.[q=Khaotic]I guess theres numbers at the end of the chart that say "20/20" and if you can read that line you have 20/20, etc.[/q]See bipper's post.