Contact lens wearers. should always have a pair of back-up glasses. Most do. I have seen contact lens patients who have extremely poor vision, uncorrected, who don't have any glasses. I had a patient come into the office yesterday with an irritated eye. There was a small bleb on the front surface of the eye which meant she could not wear her contact lenses. She had no glasses. She did wind up getting glasses immediately. Contact lens wearers should always make sure they carry their back-up glasses with them in case their eyes are irritated and they have to remove them at once. Sometimes wearing a contact lens that irritates the eye for a period of time could cause significant infection.