What's that? You don't even NEED glasses? Why are you on a site called Geekosystem, then?
Imagine that you're getting ready for sleep and take off your contact lenses only to realize that you don't know where your glasses are and have to stumble to bed without stepping on any of the stuff you've left all over the floor. You can overcome these obstacles through the clever use of pinholes. Or just cleaning your room. Whatever.