By 2050, myopia in Africa will increase five to sevenfold from prevalence rates estimated in 2000. In the next 35 years, most African countries will have over 25% of the population needing corrective glasses.
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Short-sightedness usually develops in childhood, and occurs when the eye grows excessively long. This results in blurred distant vision.(Photo/Jon-Hyams/Orbis/Flickr).