Many people have only one good eye. Despite this limitation, they live perfectly rich and normal lives. We recommend these fine people take extra precautionary steps to keep their good eye “healthy.” For example, if a rock randomly strikes you in the eye you don’t have a backup eye to rely on. Conversely, if you get in a car accident, it would be nice to have some additional protection from flying glass. Monocular precautions usually involves safety glasses or getting your prescription glasses made of polycarbonate plastic (which acts like safety glass). If you wear contacts, then good hygiene becomes especially important as you don’t want to get an infection in your only eye.