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Refractive errors are the most common of the ocular problems among all age groups. According to studies and reports from the World Health Organization, they are also the first cause of visual impairments and the second cause of visual loss worldwide, as 43% of global visual impairments are due to refractive errors. Uncorrected refractive errors were the cause of blindness in 6.8 million people in 2010 worldwide. In the United States astigmatism occurs in 1 out of 3 people.


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