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)

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Photo by: Joshua Seybert |  VIRIN: 190411-F-UJ876-8952.JPG