If you wear glasses eventually at some point you will end up breaking them, especially in a shtf situation and if you don’t have a spare set you could be in a world of trouble. Pinhole glasses aren’t some new discovery, people have known for some time now that looking through a tiny hole can sharpen your vision. So if you find yourself with broken glasses you can make a pair using some duct tape, so check out the video below by the survival doctor showing you how to go about it.