未及时矫正的近视，远视和散光是视觉问题的主要诱因。
Uncorrected cases of near-sightedness, far-sightedness and astigmatism are the leading cause of vision problems.
未经矫正的屈光不正(近视、远视或散光)，43%。
Uncorrected refractive errors (myopia, hyperopia or astigmatism), 43 %.
屈光性角膜切除术(PRK)：当你有低于中等度数的近视或者远视，或者近视加散光，有时会选择prk。
Photorefractive keratectomy (PRK). PRK is sometimes used if you have a low to moderate degree of nearsightedness or farsightedness, or if you have nearsightedness with astigmatism.
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