I am considering doing an Xterra festival with a 1km swim 30km mtb and 11km run. one of the main things I am worried about is that My eyesight could be a lot better and I need to wear my contacts but don't they get all messed up and fall Out in the water. Is there a way that I can wear them while swimming so I can ride and run faster. Does anyone have experience with this sort of dillema.