No telling how the eye disease can go for any individual. I had it quite bad although that is relatively rare.
How bad it gets does not seems to matter in regard to physical condition, etc. I had a very conciencious diet and in terrific physical shape being an avid rock climber. The only thing I have heard is that smoking can agravate the eye condition, or the thyroid for that matter.
Don’t be too concerned about it, chances are good you won’t have major problems. Do see an ophthalmologist if you have any thoughts that you are having eye discomfort. They can track the condition of your eyes. I waited too long myself and have some nerve damage.
Let me know if I can be of assistance.