There are people in my flying school with -6 and -8 power and they have cleared their class 1 tests.
This issue of not clearing is caused by some overzealous doctors. Unless of course there is some other issue.
I would not recommend LASIK
But if you still want your eyesight to improve, You can try Sampoorn eye yoga at Bandra, mumbai. I know this works because of some references of this person from a friend who joined the Navy and one chap at work....
Hope this helps,
Cheers !