I have 20/20 vision uncorected near and far but I have a dilated refraction error of +3.50 which is just outside SNA limits, so I am contiplating PRK, I passed the MEPS Physical with no problem so I can get an SNA slot but I know I will possibly fail the flight physical becasue they test that, but there is a chance I might pass without PRK becasue I am borderline. My question is does anyone know if I were to get an SNA slot and then fail the flight physical could I then have PRK and still hold on to my flight slot, or do I have to have PRK before ever even applying for the slot.