Marine Corps Sergeant Cody Mongosa, Marine Corps Network Operations Security Command remains motionless as a Technolas Orbscan is taken of the patient's eye, at Joint Base Andrews, Md. the Orbscan measures the patient's anterior and posterior chamber of the cornea, anterior and posterior corneal surface elevation maps, and regional pachymetry. (U.S. Air Force photo/Staff Sgt. Perry Aston)