When the cornea curves or flattens unevenly, the result is astigmatism, which disrupts focus of near and distant 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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This is because the distance from the eyes to the keyboard or music stand is intermediate between reading and distant vision.

因为在弹奏时眼睛与键盘或乐谱的距离正好在平时阅读视距和眺望远处的物体之间。

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Conclusion the new type of 2.5x monocular or binocular telescopes can effectively improve the distant vision of low vision patients.

结论新型国产两用望远镜助视器具有较高的临床使用价值，可作为低视力患者看远常用的助视器。

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This is not some distant vision for America.

WHITEHOUSE: President Obama��s Oval Office Address on BP Oil Spill & Energy | The White House

Mr Blair's vision of an enlarged union and a reformed parliament may come to seem relatively distant, compared with the pressing questions raised by the adoption of the human-rights charter later this year.

ECONOMIST: Britain and Europe

Yet the most provocative aspect of his vision, that avant-garde art could be a truly popular and collective experience, may be more distant than ever in the fragmentary multi-channel long-tail present.

FORBES: If You Think 'Breaking Bad' Is Edgy, You Obviously Haven't Seen Nam June Paik's 'Magnet TV'