I guess the only advantage to get it after Part 1 is to make sure everything else is passing. If you feel like you’ll pass everything else fine, then probably just get LASIK before messing with the flight physical.
After getting LASIK, you need to wait 180 days (6 months) before you can get a waiver to pass the flight physical. This might be different if you’re already in the military. I had to go to MEPS before the flight physical and they needed it to be 180 days after the surgery.
I also had to get 2 separate manifest refractions 30 days apart from each other. This can be done after 90 days from the surgery.
If getting LASIK, make it clear from the beginning why you’re doing this and that you need ALL the paperwork by the end of it.
I had LASIK surgery last September and will be on the July WOFT board.
Let me know if you have any more questions and you can message me.