Col. (Dr.) Joseph Giovannini, 779th Aerospace Medical Squadron ophthalmologist, uses a rotary scrubber to remove epithelium cells prior to a Photorefractive Keratectomy procedure March 18, 2015, in Malcolm Grow Medical Clinics and Surgery Center on Joint Base Andrews, MD. After scrubbing, a laser can reshape the eye as needed for the patient’s prescription. (U.S. Air Force photo/Senior Airman Preston Webb)