Depression and chronic pain are associated with dry-eye syndrome, a British study finds. And it's more likely as you age. Boris Lyubner/Illustration Works/Corbis hide caption

itoggle caption Boris Lyubner/Illustration Works/Corbis

A view of Interstate 65 in Alabama through bioptic lenses, which allow people who are severely nearsighted to drive. Dan Carsen/WBHM hide caption

itoggle caption Dan Carsen/WBHM