Maj. Bryan Kemper, 28th Medical Operations Squadron optometrist, uses a lens to magnify and view the eye of Master Sgt. Juan Lopez, 28th Aircraft Maintenance Squadron production superintendent during an eye exam at Ellsworth Air Force Base, S.D., Sept. 12, 2013. By using magnification, Kemper was able to evaluate the retna and back of the eye to ensure the entire organ was healthy. (U.S. Air Force photo by Airman 1st Class Alystria Maurer/Released)