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Allan Rhoades, 92nd Aerospace Medicine Squadron optometrist, uses a phoropter during an eye exam of Senior Airman Ilya Demchuk, 92nd Civil Engineer Squadron heating, ventilation, air conditioning and refrigeration technician, in the base optometry clinic at Fairchild Air Force Base, Wash., Aug. 22, 2012. The phoropter is an instrument containing different lenses used for refraction of the eye during sight testing to measure a patient’s refractive error and determine his or her eyeglass prescription. (U.S. Air Force photo by Senior Airman Benjamin Stratton)
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