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Tech. Sgt. Paula Barkhauer, 92nd Aerospace Medicine Squadron optometry NCO in charge, uses a machine designed to check eye pressure on Senior Airman Ilya Demchuk, 92nd Civil Engineer Squadron heating, ventilation, air conditioning and refrigeration technician, as an essential step of his eye exam in the base optometry clinic at Fairchild Air Force Base, Wash., Aug. 22, 2012. The “puff of air” checks the patient’s eyes for signs of glaucoma by putting pressure on the optic nerver. Glaucoma is a disease known for causing blindness. (U.S. Air Force photo by Senior Airman Benjamin Stratton)
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