Originally Posted by woodrow1029
I always get amused when someone says they have 20/10 vision. Brendan Evans used to say that to me and other chair umpires on the pro tour, because he had corrective surgery that gave him 20/10 vision. From that point on, it has been 1000% clear to me that 20/10 vision does not automatically mean that you have good vision when it comes to calling lines.
This is true, although telling someone "I have 20/400 vision" is even less likely to give them confidence in your line calls.