U.S. Air Force Capt. Lauren Matthews, 633rd Aerospace Medicine Squadron optometrist, checks the pupil dilation and constriction of Patricia Schlap, wife of U.S. Navy retired Senior Chief Petty Officer William Schlap, at Langley Air Force Base Va., Jan. 16, 2015. In addition to performing routine exams, the Langley Optometry Clinic offers eye glass and contact lens prescriptions. (U.S. Air Force photo by Airman 1st Class Areca T. Wilson/Released)