corneal thickness, corneal topography, whether or not you have dry eye
or ocular surface disease are only a few. I would seek out a very reputable refractive surgeon, and have a complete evaluation. Don't just be swayed by price. A really good refractive surgeon will screen you carefully, and honestly tell you that you are not a good candidate if you are not. In the proper patient who is a good candidate, the results can be excellent.