Last year a high profile article in Nature suggested the reason is simply that kids don't spend much time outdoors in bright sunlight anymore. The eye's mechan

Last year a high profile article in Nature suggested the reason is simply that kids don't spend much time outdoors in bright sunlight anymore. The eye's mechanism for growing to a good focus needs that time in bright light to trigger the adjustment. http://www.nature.com/news/the-myopia-boom-1.17120 http://www.nature.com/news/the-myopia-boom-1.17120