Cornea Thickness 470 ...myopia -3.5?

No one knows for certain, the minimum thickness of cornea that should be left.  Different lasers remove different amounts of tissue per unit of nearsightedness.  Also different surgeons create a different thickness of a flap.  Lastly, is the method in which the corneal thickness was measured.  Most surgeons like to leave at least 300 mincrons of tissue at the bottom after the treatment.  For example, in my hands, I generally make a 100 micron flap.  My laser would remove 50-60 microns of tissue for a -3.5 d prescription.  That would keep above our 300 micron minimun.  Also of consideration is the method used for measurement of corneal thickness.  The actual thickness could be greater or less depending.  I urge you to seek a consultion from an experienced LASIK surgeon but be willing to have Advanced Surface Ablation PRK if your cornea is in fact too thin.

While you would not be a good candidate for LASIK, you will probably have just enough corneal thickness to do PRK.

 I would recommend a thorough consultation with your lasik surgeon and ophthalmologist first.

Good Luck