i am 30 yrs old female that had lasik 10 yrs ago.my prescription was -8.5 each eye and my corneal thickness was 535 mic. during the 5 yrs after surgery i had regression and my eyes now are -2 and -2.5 and it's stable for 4 yrs, i want to know can i do prk as an enhancement after initial lasik ?and am i a good candidate?i have floater and some times flashing but i don't have retinal hole or tear.