I was diagnosed with Keratoconus 5 years ago and was told there was no cure for it, so subsequently my eyes got worse. I continued to fly until my new employer (the airline I always wanted to work for) said no. I discovered and underwent Corneal Cross Linking in both eyes, and had a Keraring implanted in my right eye. The surgery was interesting, but uneventful, the recovery was the worst pain and discomfort imaginable. The surgeon was top notch although lacking in bedside manner. All in all I was grounded for 7 months, but once able to meet the vision requirements they let me back into the skies and back to work. Take it from me, it is stoppable, and In some cases fixable, have the surgeries before its too late!
Did you get your medical from New Zealand Authority or any JAA country? If it's JAA, than that's a very promising post for us.