Capt. Frank Cumbie, 1st Helicopter Squadron pilot, sits at a slit lamp while his eye is examined prior to a Photorefractive Keratectomy procedure March 18, 2015, in Malcolm Grow Medical Clinics and Surgery Center on Joint Base Andrews, MD. The slip lamp allows a doctor to examine patients’ eyes prior to procedures such as PRK. (U.S. Air Force photo/Senior Airman Preston Webb)