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Senior Airman Danielle Harkins, 92nd Comptroller Squadron budget analyst, is assessed for her visual acuity as part of her eye exam as she is fitted for contact lenses in the base optometry clinic at Fairchild Air Force Base, Wash., Aug. 22, 2012. This test measures for spatial resolution of the visual processing system alternating between different eye combinations and letter sizes to measure distance abilities. (U.S. Air Force photo by Senior Airman Benjamin Stratton)
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