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A phoropter, which is used during an eye exam to measure an individual's refractive error and determines their eyeglass prescription, is setup for the Smoky Mountain Innovative Readiness Training mission, Swain County High School, Bryson City, N.C., Aug. 3, 2017. The IRT program meets training requirements for active, reserve and National Guard members and units while addressing public and society needs. (U.S. Air Force photo/Senior Airman Damien Taylor)
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