ChimpHaven

Pierre, a 54-year-old chimpanzee living at the ChimpHaven sanctuary in Louisiana, has had his sight restored after years of blindness caused by cataracts. Veterinary ophthalmologist Kenneth Pierce replaced the clouded lens in his eye. His caretakers spent months training him to hold his face still against the mesh and keep his eyes in position for treatment. The story is drawing attention for the patience and cooperation required to give surgery to a great ape.