My cornea thickness is 470 micrones and have myopia of -6 in left and -5 in right eye, am I a candidate for ASA/PRK?

Current standard are to leave at least 300 microns of corneal tissue behind to maintain proper corneal strength and integrity. If you underwent PRK for your current correction, you would have more 300 microns left. All else being normal, it appears you would be a candidate. Good luck.

There is not 100% agreement amongst doctors regarding your situation. Most doctors like to leave at least 300 µm that have not been affected by the treatment. This can be accomplished in your case, so I feel that if all other things are normal then you are a good candidate for PRK/ASA.