I had advanced keratoconus and was recommended for a corneal transplant eleven years ago. My optometrist helped me smooth out the disease using hard contacts. He used a flat fit, which is hard to find because the textbooks are teaching to use a steep fit. I also had a significant regression after I changed my diet. I am no longer advanced, but unfortunately, I am the only case I know of that has gotten that much better. I'm working on an extensive site, but here is an old one I have up temporarily that details my story
For most people, keratoconus is no big deal, and they can fix it with contacts. Only 10% end up as bad as me. Good luck!