This is an New Scientist article on an epidemiological study on the causes of myopia. The link is to a blog which copied the content. The original is behind a paywall.
The fact that this paper is behind a paywall makes me freaking mad because it could literally save the eyesight of a huge number of people.
An excerpt:
On average the children in Sydney spent nearly 14 hours per week outside, and only 3 per cent developed myopia. In contrast, the children in Singapore spent just 3 hours outside, and 30 per cent developed myopia. Once again, close work had a minimal influence; the Australian children actually spent more time reading and in front of their computers than the Singaporeans
Original Article: http://www.newscientist.com/article/mg20427331.100-generatio...
Actual Content: http://www.sunilreddy.com/?p=1429
An excerpt: On average the children in Sydney spent nearly 14 hours per week outside, and only 3 per cent developed myopia. In contrast, the children in Singapore spent just 3 hours outside, and 30 per cent developed myopia. Once again, close work had a minimal influence; the Australian children actually spent more time reading and in front of their computers than the Singaporeans