Air Force Maj. (Dr.) 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 Air Force Capt. Brent Danner, May 3, 2018. The medical procedure corrects degenerative eye conditions progressive keratoconus and corneal ectasia. Air Force photo by Laurie Wilson