1. Corrective mask makes a handy back-up in case you have any eye problems and cannot wear your contacts at some point during a dive vacation. This has only happened to me once in 9 years, but the mask with corrective lenses saved the trip. I've also used it lots in pool practice dives, where the water has nasties that I don't want finding a home in my contacts.
2. Use disposables and bring extras to the dive site. That way, if you lose one, you can always replace it during your next surface interval. See #4 if this happens.
3. Close your eyes and you should be fine. If not, see #4.
4. If anything is going to go wrong with contacts and diving, wouldn't you want to have that sorted out during training? While GUE instructors can get creative in cascading problems upon students, they are just attempting to create a realistic level of task loading that divers have had to deal with during underwater emergencies. It's not the actual combination of problems that's important- just the experience sorting out the scrambled brain and self-doubt they cause. If you're worried about losing a contact during training, then you should worry just as much about losing it during a real emergency.
Cameron
