Air Force Staff Sgt. River Carson, 8th Medical Operations Squadron public health technician, stares through the phoropter at a letter chart during his eye exam 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: 3758px × 2600px
Photo credit: © AB Forces News Collection / Alamy / Afripics
License: Licensed
Model Released: No

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