When the cornea curves or flattens unevenly, the result is astigmatism, which disrupts focus of nearanddistant vision.
散光是当角膜变弯或者变平时表面不平坦,影响视近、视远时的聚焦。
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Farsightedness is the opposite, in a way: A shorter-than-average eyeball or too-flat cornea focuses light behind the retina instead of on it, making near vision and sometimes distant vision blurry.