The lens of the eye accommodate to distance.

眼球晶状体能根据距离进行调节。

youdao

He worked hard at training his eye and brain to tell the correct distance.

他进行艰苦地训练，让眼睛和大脑告诉他正确的距离。

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We do this with eye sight: Nearsightedness could have been fatal for people whose ability to survive depended on spotting dinner off in the distance.

我们就把该愿望付诸于矫正我们的视力：近视眼给依靠在远处发现晚宴的能力而生存的人来说是致命的。

youdao

He worked hard at training his eye and brain to tell the correct distance.

VOA: special.2009.03.18

Same distance, same eye chart, the only difference being they're sitting in a flight simulator and they were wearing pilot overalls.

相同的距离，相同的视力表，唯一的不同是，他们坐在,飞行模拟器里，穿着飞行服。

哈佛公开课 - 幸福课课程节选

The eye tracker also detects the eye distance of the wearer by measuring the eyes' vergence, which allows to optimize the 3D experience for individual physiognomies.

ENGADGET: SMI Eye-Tracking 3D Glasses use rim-based cameras to adjust perspective

"Sunflowers" (1888 or 1889), from Philadelphia's own collection, is a virtuoso performance in color harmony, showing a ceramic vase of perky yellow blossoms against a swirling cerulean background, but it is entirely orthodox from a compositional standpoint, as the vase sits squarely in the middle distance at eye level.

WSJ: Vincent Van Gogh Up Close | Philadelphia Museum of Art | A Matter of Perspective | By Jonathan Lopez

Viewing visual contents on Samsung's Curved OLED TV is a comfortable experience for the human eye, as the curved panel allows the distance between the user and TV screen to be the same from almost any angle.

ENGADGET: Samsung announces 'world's first' curved OLED, we go eyes-on