1/24/2008 - Staff Sgt. Mary Nelson, 48th Aerospace Medicine Squadron, undergoes a refraction eye test, Jan. 22 at RAF Lakenheath, England. A refraction test measures the eyes' need for corrective lenses. (U.S. Air Force photo by Airman 1st Class Erika Brooke)

1/24/2008 - Airman 1st Class Larissa Labarbera, 48th Aerospace Medicine Squadron optometry technician, gives Staff Sgt. Mary Nelson a refraction eye test, Jan. 22 at RAF Lakenheath, England. A refraction test measures the eyes' need for corrective lenses. (U.S. Air Force photo by Airman 1st Class Erika Brooke)

1/24/2008 - Airman 1st Class Larissa Labarbera, 48th Aerospace Medicine Squadron optometry technician, gives her patient a visual field test measuring all areas of eyesight including peripheral vision, Jan. 22 at RAF Lakenheath, England. (U.S. Air Force photo by Airman 1st Class Erika Brooke)