Maj. Bryan Kemper, 28th Medical Operations Squadron optometrist, performs a slit lamp test on U.S. 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 consists of visually evaluating the surface of eyes for anything that could harm the eye or its vision. (U.S. Air Force photo by Airman 1st Class Kate Thornton/Released)