Lions, giraffes, tigers, rabbits, bears, rhinos and even owls can go blind from cataracts, but an east German firm has an answer: custom-made "contact lenses".
The acrylic intraocular lenses are implanted into animals' eyes when their vision has clouded to the point of total impairment, and are fitted for various species, from cat-eye-sized to fist-width for rhinos.
Impaired vision can also blunt the sex drive, stopping animals from reproducing. The World Wildlife Fund, for example, has paid for lens transplants for brown bears in a preserve in China.
Contact lenses for animals