People with glasses!!!!

Hi,

I've got a super Spartan in just over a week. I wear glasses and the fall off when I'm doing my circuit training/boot camp. I'm so worried that they will fall off in the Spartan a d then i wont be able to see much at all. I do have contacts but haven't ever tired wearing them for rigorous exercise. I suppose the alternative would be to get those elastics that keep glasses on...

What did you do? Was wearing contacts glasses ok for your obstacle race?

Help!! :S