U.S. Air Force Senior Airman Joshua Gaon, 633rd Surgical Operations Squadron ophthalmic technician, receives a retina examination at U.S. Air Force Hospital Langley at Langley Air Force Base, Va., Dec. 17, 2013. In addition to routine eye exams, the squadron's optomitry clinic offers single, bi-focal, tri-focal, spectacle and contact lens prescriptions to all active duty personnel. (U.S. Air Force photo by Airman 1st Class R. Alex Durbin/Released)