Why Are So Many People Nearsighted?

Myopia, or nearsightedness, is reaching epidemic proportions. In the US, over 40 percent of the population needs glasses; estimates suggest that one-third of the world’s population will be nearsighted by the end of the decade. Myopia can usually b…

Popular Science – Wednesday, March 18, 2015

http://a.msn.com/r/2/BBinO6x?a=1&m=EN-US

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