Buried Indoors, Ranks Of Nearsighted Grow

Why are more people nearsighted today than ever? Researchers say all the time we spend indoors and away from the sun is making our vision worse. Guest host Susan Stamberg talks with neuroscientist Sandra Aamodt. She and co-author Sam Wang wrote about the issue in their upcoming book, Welcome to Your Child's Brain: How the Mind Grows from Conception to College.