Tech. Sgt. Mark Slater, 28th Medical Operations Squadron optometry NCO in charge, sets up an auto-refractor to examine Airman 1st Class Charles Wood, 28th MDOS patient travel administrator, during a health evaluation at Ellsworth Air Force Base, S.D., March 15, 2013. The optometry clinic is responsible for administering eye exams, issuing corrective lenses, acting as a liaison for optical surgeries and similar optical services to Airmen and their families at Ellsworth. (U.S. Air Force photo by Airman 1st Class Zachary Hada/Released)