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U.S. Air Force Maj. Marc Neuffer, chief of cornea and refractive surgery at the U.S. Air Force Academy’s 10th Medical Group, prepares to perform collagen crosslinking on patient Capt. Brent Danner, an Air Force pilot, May 3, 2018. The medical procedure corrects progressive keratoconus and corneal ectasia, which are degenerative eye conditions. (U.S. Air Force photo by Laurie Wilson)
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