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In the 1950s, roughly 20 to 30 percent of 20-year-olds in Hong Kong, Taiwan and South Korea suffered from myopia.For example, one study from the American Academy of Ophthalmology undertakes a meta-analysis of 145 studies of the rise in myopia and then projects the increases forward based on the historical trend along with projected urbanization and demographic data.By 2050, half of the global population, or almost 5 billion people, are projected to be nearsighted, up from a quarter, or 1.4 billion, in 2000 .In Europe, for example, the prevalence for 45 to 49-year-olds with a college degree was above 50 percent, compared to 26 percent among those with a high school degree.Interestingly, however, while outdoor time helps to prevent nearsightedness, it doesn't seem to affect its progression once it develops.
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