人眼的焦距
Focal length of the human eye
以上为机器翻译结果，长、整句建议使用 人工翻译 。
研究人员必须解决的一个重要的 问题是，人眼的最小焦距是几厘米，无法分辨出隐形眼镜上显示的物体。
One major problem the researchers had to overcome was the fact that the human eye, with its minimum focal distance of several centimetres, cannot resolve objects on a contact lens.
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