Try having vision worse than 20/200 and getting around without glasses. When I traveled, pre-contacts, I always packed a spare and a repair kit. With contacts, I pack one pair of glasses, a repair kit and spare contacts, its essentially the same prep and experience. Except now I have peripheral vision and can wear whatever sunglasses I have on hand. They also don't fog up like glasses do, which makes the transition in and out of buildings in hot, humid climates where AC is prevalent less annoying.