They make really thin fold up glasses that are normally for reading (far-sighted people). I had a pair of my near-sighted prescription lenses put in them. They are really too small to wear all the time, but if you break your glasses they will work long enough to get you around and they are small enough to stick in your pocket. I keep them in my laptop bag that I carry around, I also have a spair pair in my desk, sunglasses in my truck, and a spare in my shooting bag (though those are polycarb lenses that are setup to match my eye position when shooting, so they are a little funky to walk around in). <img src="/images/graemlins/smirk.gif" alt="" />