Myopia, or nearsightedness, is reaching epidemic proportions. Estimates suggest that one-third of the world's population will be nearsighted by the end of the decade. Myopia can usually be treated easily with glasses, contact lenses or surgery.
The condition's sheer pervasiveness has made researchers wonder about its cause. Now, scientists think they have a good understanding of why nearsightedness has become more common: young people are spending too much time indoors, according to a report published today in Nature.
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