China represents one fifth of the blind people in the world: more than 8 million of its population of 1.4 million.
Corneal disease is responsible for about half of these cases, and for many people the only hope is a transplant.
Due to lack of human cornea, last year, the Chinese government has given the green light for the experimental use of pig corneas in the past year.
200 operations were performed.
Wu Pinggui speaks after transplantation the BBC the cornea of a pig in his eye.
Read more: How the scientific super-sizing China
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