20/70 correctable to 20/20 is the requirement for a Class 1 flight physical in the USAF. 

However, the USAF will issue some waivers, and does allow PRK and LASIK for some people (make sure you are approved beforehand, or it can become a disqualification).

Don't listen to people who pop in and feed you misinformation about needing perfect eyesight to qualify.  It may have been that way in WWII, but it is not the current requirement.