U.S. Army Dr. (Lt. Col.) Michael Hamilton, McDonald Army Health Center ophthalmologist, performs cataract surgery at Fort Eustis, Va., March 7, 2013. Ophthalmology services are a part of the eye clinic, which handles treating eye diseases, lens fitting and prescriptions to improve the health of patients’ vision. (U.S. Air Force photo by Staff Sgt. Ashley Hawkins/Released)