If you have thin corneas and were told you were not a candidate for laser-assisted in situ keratomileusis, or LASIK (a corneal refractive procedure that requires the creation of a partial-thickness flap before the cornea is sculpted with a laser), PRK (Photorefractive Keratectomy) may be a good option for you.    PRK may be a good choice if you: Want to reduce or eliminate your dependency on glasses or contacts Are at least 18 years of age, with stable vision for at least one year Have healthy eyes with no sign of glaucoma or cataracts Have thinner than average corneas Have had previous eye surgery such as RK (Radial Keratotomy) Are involved in contact sports (boxing, sky diving) Have a job that may involve eye injury (law enforcement, professional athlete)