Um, unsurprisingly, they thought of that > Rose's team tried to eliminate any other explanations for this link — for example, that children outdoors were engag

Um, unsurprisingly, they thought of that > Rose's team tried to eliminate any other explanations for this link — for example, that children outdoors were engaged in more physical activity and that this was having the beneficial effect. But time engaged in indoor sports had no such protective association; and time outdoors did, whether children had played sports, attended picnics or simply read on the beach. And children who spent more time outside were not necessarily spending less time with books, screens and close work. “We had these children who were doing both activities at very high levels and they didn't become myopic,” says Rose. Close work might still have some effect, but what seemed to matter most was the eye's exposure to bright light. http://www.nature.com/news/the-myopia-boom-1.17120 http://www.nature.com/news/the-myopia-boom-1.17120 The evidence is far from overwhelming, but the data is a lot more useful than your layman intuition...