Nikou, a 15 - year - old gorilla at the Zhengzhou Zoo, received and artifical cornea in surgery on Friday, the official Xinhua news agency reported.
The 100 - kilogramme gorilla began losing his sight several months ago because of cataracts, the report said.
"It couldn't walk and climb as freely as before, and even became fairly depressed due to the illness," zoo keeper Han Huaien was quoted as saying.
Twelve zoo keepers have been assigned to watch Nikou around the clock to keep him from pulling off his bandages, Xinhuua said. -Associated Press.