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A patient looks through a phoropter during an eye examination training session at the Pittsburgh International Airport Air Reserve Station, Pa., April 11, 2019. The training session taught optometry personnel how to properly use a phoropter to determine the prescription of glasses a patient needs to correct their vision. (U.S. Air Force photo by Joshua J. Seybert)
24.0-70.0 mm f/2.8
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