U.S. Air Force Staff Sgt. Dwain Tolbert, 18th Aeromedical Squadron ophthalmic technician, asks patient U.S. Air Force Senior Airman Christie Chatham, 961st Airborne Air Control Squadron member, to follow the light during a pre-screening at the optometry clinic on Kadena Air Base, Japan, Oct. 12, 2011. Kadena's optometry clinic sees roughly 35 to 40 patients a day and provides care for active-duty service members, retirees and their families. (U.S. Air Force photo/Airman 1st Class Brooke P. Beers/Released)