Bionic cat eyes may help restore sight in people

Gingersnap, a 4-year-old Abyssinian, rolled lazily on the examining table while Dr. Kristina Narfstrom rubbed the cat's cinnamon-colored head. Then, using a special viewer, Narfstrom peered deep into Gingersnap's eyes to measure the 4-year-old cat's losing battle with a...