The device, called OcuCheck, works by measuring levels of vitamin C in the fluids that coat or leak from the eye. The sensor could speed efforts to determine the extent of eye injuries at accident sites, in rural areas lacking ophthalmology specialists, or on the battlefield, the researchers said. Dipanjan Pan, assistant professor of Bioengineering at the University of Illinois at Urbana-Champaign, is creating the device in collaboration with Dr. Leanne Labriola, Carle ophthalmologist, Urbana, Ill.