HectorD,
Definitely take Stealth114's advice when it comes to the contact lenses. I have been wearing them for many years now and have had no issues when it comes to flying with my contacts in.
I would definitely recommend that you carry a pair of prescription glasses with you since most places require you to have them if you are wearing contact glasses. There have been plenty of times when I have taken my contacts out and put on my glasses while flying. It makes a whole difference in the world if you have that one contact that bugs you.