Tom, if a Shooting Doc puts the optical centers in the correct spot(s) for your eyes with your head in shooting position AND gives you the right prescription, you are in for a very, very pleasant surprise. I've tried several times and I don't think you can simulate that using the dinky little test lenses the Optometrist or Ophthalmologist uses.
I was 20/10, 20/15 in college, naturally. Now the best they can correct to is 20/20, 20/15. Unfortunately, I'm right handed.