Master Sgt. David Sims, 57th Aircraft Maintenance Squadron first sergeant, has his eyes evaluated by a wavefront aberrometer during a routine eye exam June 7, at Nellis Air Force Base, Nev. The wavefront aberrometer measures the way a wavefront of light passes through the cornea and the crystalline lens, which are the light-focusing components of the eye. (U.S. Air Force photo by Senior Airman Daniel Hughes)
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