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Focuses light onto the retina. It changes shape to make sure that the 'picture' on the retina is as clear as possible.

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The coloured part of your eyes that controls the amount of light that enters the eye.

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It shows the picture you are seeing - upside down, remember? They turn the picture into an electrical message for the brain.

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The hole in the coloured iris. It lets light into your eye.  It gets very small in bright light, and bigger in dull light.

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The messages travel along these to your brain.

Your brain turns the picture the right way up.

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The 'white' tough skin which covers the outside of the eyeball.

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The transparent (see-through) skin that covers the front of the eye