Note on contacts: because you're physically inserting a medical device into your eye, part of your annual exam is making sure that you are not causing any (potentially permanent) damage do your eye. While hopefully you are not abusing your contacts, even in normal use, sometimes the eyes can be harmed, which can cause major problems down the road for you. In my opinion, the expiration is probably a good thing if you're proponent of trying to protect people's eye health.
