U.S. Air Force Capt. (Dr.) William Catt, 99th Aerospace Medicine chief of aerospace optometry, checks the vision of Master Sgt. David Sims, 57th Aircraft Maintenance Squadron first sergeant, during a routine eye exam June 7, 2013, at Nellis Air Force Base, Nev. Catt is watching Sims’ eye as he tracks the stick to see how well the eyes work together. (U.S. Air Force photo by Senior Airman Daniel Hughes)
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