Tech. Sgt. Mark Slater, 28th Medical Operations Squadron optometry NCO in charge, administers a corneal topography to U.S. Army Staff Sgt. David Neugebauer, 235th Military Police Company training NCO, during a routine eye exam in the optometry clinic at Ellsworth Air Force Base, S.D., April 12, 2012. The test maps a patient’s cornea for raised areas and surface inconsistencies to prevent infections or degenerative diseases. (U.S. Air Force photo by Airman 1st Class Kate Thornton/Released)