Step 1: LASIK surgery; I'm friends with the LASIK surgeons at Duke and could facilitate a consultation for you.
Step 2: Use inexpensive wrap-around sunglasses when on the water.
Alternative 1: Get fitted with soft contact lenses, then use inexpensive sunglasses. Certain brands block UV rays also.
Alternative 2: Wrap around sunglasses that will fit over your glasses
Good Luck.
Rgds,