It gradually destroys the rods and cones that detect light in the retina of the eye. But it does not harm the optic nerve, which transmits electrical impulses from the retina to the brain.

这种病会逐渐破坏视网膜可以感光的视杆和视锥，但是不会损害视觉神经，视觉神经负责将视网膜神经脉冲传递到大脑。

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For the purposes of our discussion, the key parts of the eye are the lens, the iris and the retina (where we find the rods and cones).

为了便于讨论，我们来谈谈眼睛的主要部位：晶状体，虹膜和视网膜(在那里我们可以找到视杆细胞和视锥细胞)。

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The push rod can be supplied free or captive, with female M5 thread, an M5 rod eye, or dome end, captive push rods can be sprung loaded, in either direction, on sensors up to 250 mm of travel.

在推杆可以提供免费或俘虏，其中女性M5螺纹，一个M5的棒眼，或球结束，圈养推杆弹簧加载，可以在两个方向，对传感器多达250毫米的旅行。

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Mr Ball next treats us to a brisk description of the human eye (remember rods and cones from school biology?), an explanation of why Newton was right and Goethe wrong about the composite character of white light, and an account of the 19th-century regimentation of the continuous colour spectrum by means of colour wheels and other classifying devices.

ECONOMIST: Science and history of colour

When a beam of light is focused by the cornea and the lens, at the front of the eye, on to the retina, at the back, it stimulates photosensitive cells known as rods and cones.

ECONOMIST: The biology of art | The