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The layer of nervous cells sensitive to light as 2 most important cells. Roods and cones. The first are mostly in the peripheral parts of the retina and so gives the peripheral vision. They create a nervous stimulation when they are affected by a small quantity of light. The signal of a lot of rod are sum in only one nerves that goes to the brain and it became strong enough, and this is that motivation for the dimension of a "pixel" is bigger in this part of the peripheral vision. So the peripheral vision is more important in the night vision of animals, for the vision of the movement, but not for read.

The central part is the part of the 3 types of cones, sensitive to 3 different electromagnetic radiation, cyan, magenta and yellow, that in combination are all the colours. And in the central part we can recognize how different points very close.

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