Two important types of photoreceptors are rods and cones.

其中重要的两种光感受器是杆状和锥状细胞。

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Like rods and cones, these ganglion cells are found in the retina.

与杆状和锥状细胞一样，神经节细胞也是在视网膜上发现的。

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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 cells are known as photo receptors and come in two varieties: rods and cones.

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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.

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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.

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