Your corneas certainly are substantially thinner than normal. LASIK would not be a good option. If your corneal topography is completely normal, you could have PRK surgery. There is no clear consensus on how thin a cornea can safely be after PRK, but in my experience 400 microns has not caused any problems like ectasia (bulging of the cornea from being left too thin after LASIK or PRK). At 12-14 microns per diopter of treatment (depending on laser used, and treatment zone), your ablation depth would be 54 to 66 microns. The ICL would be a perfectly good option, though it is a bit more expensive and slightly more invasive. If there is ANY question as to whether your corneal topography is normal or not, I would opt for the ICL. Otherwise, as far as which is better, both are equally good in my opinion.