My son is 24 and has myopia of -14 diopters. He also has astigmytism - fairly bad but I can't state the number. Is he a candidate for lasik or other eye surgery. His retina is thin and cornea is flat.

I would doubt it unless he has super-thick corneas. You could call up and ophthalmologist who does the surgery and talk to them about his options. A lot of those guys will do free consults.

You may want to consider :The Visian Implantable Collamer Lens (ICL - it is not an implantable contact lens) and the Verisyse is a phakic intraocular lenses (P-IOL). A P-IOL is a "helper" artificial lens implanted inside the eye (in the anterior chamber), to reduce refractive error. P-IOLs are an alternative to conventional or wavefront Lasik, All-Laser Lasik, PRK, LASEK, and Epi-Lasik for patients with very high myopic (-15 D or more) (nearsighted-shortsighted) vision.

Based my own personal experience and research, I would advise that if the highly myopic can remain corrected in glasses and contacts, this is the wiser choice with much less risk of complications and visual aberrations.