Pronghorn, dependent on distance vision and speed to keep safe from predators, traverse high, open shoulders of land, where they can see and run.

叉角羚依靠远距离视觉和速度来躲避捕食者，它们在开阔的高地上穿行，在那里它们能看见东西并追逐它们。

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Distance vision helps relax your eye muscles, which stops eye fatigue in its tracks.

向远处眺望有助于放松眼部肌肉，从而缓解眼部疲劳。

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Their blurred distance vision is caused by over use of the eyes' focusing mechanism.

它们的远视力模糊是由于过度用眼所造成的。

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The RAIB also said it appeared that Mr Mackay was not wearing spectacles to improve his distance vision as he was advised at eyesight examinations in 2006 and 2009.

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However, the RAIB also said Mr MacKay may not have seen, or had misinterpreted, the warning lights at the level crossing and appeared not to have been wearing glasses to improve his distance vision.

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And it is an irony of presidential politics that the signature health care bill he intended to used as evidence of his political vision became a liability from which he had to distance himself four years later.

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