Penguins undergo successful cataract surgery with custom lenses.

Three elderly king penguins have undergone cataract surgery and have been fitted with custom-made eye lenses in what is believed to be a world first procedure to improve their sight, according to a Singapore zoo. The lenses were custom-made in Germany with precise measurements to fit each penguin’s eye. The king penguins received custom-made intraocular lens implants, which marked “a milestone in veterinary medicine.” The penguins have made a full recovery and have shown an increase in responsiveness and activity levels.