Rod cells were the most common types of photoreceptor found in all 17 shark species, which means the predators should be able to see within a wide range of light levels.

在17种鲨鱼的视网膜中，最常见的感光体是视杆细胞，这意味着鲨鱼在不同的亮度环境下都可以看得到外界。

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Retinas use two main types of light-sensitive cells to allow animals to see: Rod cells help measure brightness, while various types of cone cells help distinguish colors.

动物主要借助网膜中的两类光感细胞获得视觉：视杆细胞帮助感知亮度，而种类众多的视锥细胞则帮助辨别颜色。

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In all 17 species, the commonest kind of light receptors were "rod" cells, which are highly sensitive to light and allow night vision but cannot tell colors apart, they found.

在所有17种鲨鱼中，最常见的感光细胞是“杆状”细胞，这种细胞对光线非常敏感，可以使鲨鱼具有夜视能力，但这种细胞无法分辨颜色。

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It is able to highlight details human eyes cannot normally see, either because they are swamped by the signal from other visible frequencies, or because they are not detectable by the rod and cone cells of the retina.

ECONOMIST: Monitor