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How your eyes work

When you look at an object, the light from it enters your eye through the pupil. The iris changes the size of the pupil, depending on how bright the light is. The lens focuses the light onto the back of the eye: the retina. The retina is a mass of light-sensitive nerve cells, called photoreceptors, which change light signals into electrical ones.

Your eye is only the starting point of how you see.
Your eye is only the starting point of how you see.
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