Senior Airman Mitchel Delfosse, 22nd Aircraft Maintenance Squadron electrical environmental system journeyman, looks through a phoropter Jan. 30, 2020, at McConnell Air Force Base, Kansas. The phoropter is used to test different lenses to determine the individual’s eyeglass prescription. ( Air Force photo by Airman 1st Class Alexi Bosarge)

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Photo credit: © Operation 2021 / Alamy / Afripics
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