Master Sgt. Jose Diaz, 9th Aerospace Medicine Squadron optometry flight chief, uses an auto refracter on Senior Airman Robert Hayes during an eye exam at the optometry clinic on Beale Air Force Base, Calif., Nov. 9, 2011. The machine is used to help determine a patients perscription and is one of many instruments used to determine the quality of an individuals eyesight. (U.S. Air Force photo by Staff Sgt. Jonathan Fowler/Released)
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