Air Force Staff Sgt. River Carson, 8th Medical Operations Squadron public health technician, left, stares at a letter chart as Maj. See Vang, 51st Aerospace Medicine Squadron optometry flight commander, changes lenses on the phoropter on his eyes 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: 4256px × 2832px
Photo credit: © PJF Military Collection / Alamy / Afripics
License: Licensed
Model Released: No

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