Hi Props - can I ask why, if your eyesight is good enough to get a CAA Class 1 medical... why do you want laser surgery ?
I would guess for the same reason that anyone wants laser surgery, to get rid of glasses or contact lenses. To be able to swim, dive and do other things without the hindrance of poor eyesight. Regardless of whether you need a class 1 or not it is desireable to not need correction.
It's possible for a person with -5 dioptre myopia to hold a class 1 (not pass an initial but renew). -5 is fairly poor vision without correction.
As I am aware CAA class 1 SRG medical will consider you if you've had LASIK procedures as long as the pre-operative prescription was within the CAA limits. LASIK is preferred to LASEK. Wavefront is better still.