As undflyboy says, it can be a pain to have a contact lens giving you trouble. A contact lens can be taken out much quicker than inserting one so if u need to take out one instantly, just get it out and put the good lens in a case with solution and pop on the glasses. I hate glasses so much I havent even got a pair on me. I need to get one though, once i start training this month. Contacts arent for everyone so you do need to make sure you learn to care for them and your eyes and then they become like second nature. You literally have to feel with your finger to make sure its there sometimes... And for the hec of it, if you're in a lay over and want to take a swim in a beach or swimming pool, get yourself one of those prescription swim googles. They are awesome!