Dr. Dennis Lam (R), founder of the C-MER (Shenzhen) Dennis Lam Eye Hospital, teaches Guo Bin how to use a device that helps him see Thursday. The boy from Shanxi Province had his eyes gouged out in a case of domestic violence in August last year. The device, Brainport, is worn on the tongue, from which it captures images and translates them into electric signals in the brain. (Story on P3)Sun Yuchen