Eyes
I know a bloke who started pilots course with glasses.
From what I know (which is not with any authority!!) they want 20/20 when you join. Can go bad the following day so long as it's correctable with glasses to 20/20.
If you have bad eyes to begin with, appeal all the way up and you may get a nod. The theory is they get enough applicants with good eyes so why bother with the others. Appeal to DG Air Force Health (is he still called this) , then when he says no (and he will) to SGADF (Surgeon General -ADF), then when he says no (and he most probably will ), Dear Minister..
PAF