Since eye glasses are SO important to always have, I always take it safe on some rides. These rides offer few lockers to store your items, so if I am not wearing my contacts, I put my eye glasses into the lockers.
The rides are Hulk, Dragon Challenge, and Rip Ride Rockit. On Ripsaw Falls and Jurrasic Park River Adventure, I wear them until near the end of the ride before the big drops when I take them off and hold them in my hand tightly so nothing happens to them.
Losing your eye glasses is nothing like your sunglasses, which I would "risk" more. If you lose your sunglasses, you can go into some of the gift shops and buy another pair. If you lose your eye glasses, you will be "blind" for the rest of your trip!