Refractive Surgery 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 SHARE IMAGE: Download Image: Full Size (0.15 MB) Tags: 10th Medical Group, U.S. Air Force Academy, USAFA Photo By: Laurie Wilson VIRIN: 180503-F-RB000-001.JPG Photo Gallery