Air Force Maj. See Vang, 51st Aerospace Medicine optometry flight commander, left, changes lenses on the phoropter while Staff Sgt. River Carson, 8th Medical Operations Squadron public health technician, stares at a letter chart on at Kunsan Air Base, Republic of Korea, March 24, 2017. The phoropter checks for refractive errors in the eyes and assists in eye glass prescriptions. ( Air Force photo by Senior Airman Colville McFee/Released)

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Size: 3919px × 2298px
Photo credit: © PJF Military Collection / Alamy / Afripics
License: Licensed
Model Released: No

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