ISLAMABAD, Aug 24: CDC finds that 99% of contact lens wearers do not wear or care for their lenses properly, increasing their risk of eye infection Some of the most common mistakes that contact lens wearers make is sleeping, showering in their contacts Chad Groeschen developed a dangerous bacterial infection in his left eye after sleeping in contact lenses. Chad Groeschen was working on an outdoor deck for a client a few weeks ago when his left eye started itching. He chalked it up to allergies at first, and then to a sinus infection after his eye got goopy and he could not see out of it. He had no idea his contact lenses were the problem. Doctors at Cincinnati Eye Institute diagnosed Groeschen with a bacterial infection that was quickly destroying his cornea, the eye’s protective outer layer. “It was basically that if I hadn’t had contacts [the bacteria] might not have incubated,” said Groeschen, a 39-year-old builder and sculptor in Cincinnati. Groeschen had been using extended wear contact lenses, and only taking them out every week to clean. Even though these lenses are approved by the U.S. Food and Drug Administration for overnight wear, the American Academy of Ophthalmology warns that this type of use increases the risk of infection. Groeschen is one of many Americans who use contacts in ways that could jeopardize their eyes. A new report by the Centers for Disease Control and Prevention found that, among the 41 million adults in the United States who wear contacts, 99% of them wear, wash or store their lenses in unhygienic ways. The most common mistakes were sleeping or napping in contacts, which 50% and 87% of wearers were guilty of. Other mistakes that people reported were failing to replace contacts (50%) and cases (82%) as often as recommended; showering with their lenses in, which can allow bacteria from the water to get onto the lenses (85%); keeping old contact lens solution in the case, which loses its disinfecting power, and just topping it off with fresh solution (55%).