Depends on what vision standard you are trying to waive, and how much you are talking about. I assume you are talking about visual acuity, ie 20/something other than 20 vision. Unfortunately, there is no definitive answer. If the AF needs pilots and you have a good recruiter/ROTC PAS, you can get a waiver for anything up to about 20/100. If the service doesn't need pilots or your recruiter won't go to bat for you, your chances of getting anything waived are small. Talk to your recruiter or local ROTC Det, and see what they have to say. If you make the Air Force want you, they will waive lots of things.
Good luck!