From left, U.S. Air Force Capt. Lauren Matthews, 633rd Aerospace Medicine Squadron optometrist, conducts an eye exam on Staff Sgt. Iolanda Johnson at the U.S. Air Force Hospital Langley optometry clinic at Langley Air Force Base, Va., Dec. 19, 2013. The optometry clinic provides state-of-the-art, comprehensive eye care, including prescription eyeglasses, diagnosis and treatment of eye diseases including glaucoma and macular degeneration, and diabetic retinal exams. Matthews hails from York, Pa. (U.S. Air Force photo by Senior Airman Jason J. Brown/Released)