First, let me say that posting this using UBB is a pain in the A@*!!!!
Second, these are the Standards. What they will waiver (which is probably what you want to know) is inappropriate for me to post. You need to ask them.
Third, these standards are for Applicants. There are different standards for trained aviators.
Standards
Visual Acuity
Pilots
USAF 20/70
USN 20/40
USMC 20/40
USA 20/50
Nav
USAF 20/200
USN correctable to 20/20
USMC correctable to 20/20
USA N/A