Senior Airman Kristy Overton, 9th Aerospace Medicine Squadron (AMDS) ophthalmic technician, prepares a Topcon Digital Retina Imaging System for use on Airman 1st Class Mai Yang, 9th AMDS, at the optometry clinic on Beale Air Force Base, Calif., Nov. 9, 2011. The machine takes digital photographs of an individual's retina for examination and displays the image immediately on their computer. (U.S. Air Force photo by Staff Sgt. Jonathan Fowler/Released)
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