Kids who spent more time in front of televisions and computer screens, and less time outside, have narrowed blood vessels in their eyes, according to a new Australian study reported in the New York Times. Scientists looked at 1,492 six-year-olds across Sydney, and had their parents answer questionnaires about how much time they spent doing physical activity, versus sitting in front of a TV or computer. They then examined the kids’ eyes. Children who watched the most TV had blood vessels in their eyes that were slightly smaller in diameter than those who watched the least. Kids who exercised the least had narrowest vessels in their eyes. What it means for these children is still unknown.