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Asked by kieranandbrandon to Anna, Jonathan, Samantha, Sam on 30 Jun 2012.
Question: whats our eyes made of ?
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Angharad Davies answered on 30 Jun 2012:
The white bit around the outside is called the sclera. It’s tough, to protect the inside. The inside is mainly some jelly-like stuff called vitreous, which contains lots of water and some protein.
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Jonathan Kay answered on 2 Jul 2012:
Different parts of your eyes have evolved from different parts of your ancestors.
Different animals have evolved eyes in lots of different ways. Our eyes are like those of other mammals, reptiles, birds, amphibians and fish. (Not sure that’s true of all fish.) But eyes of squids, spiders and insects are completely different. Improving what you can see was obviously very important.
(Flying evolved in lots of different ways as well.)
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Samantha Weaver answered on 4 Jul 2012:
Your eyes are made up of muscles, blood vessels, a nerve (the optic nerve) and a jelly type substance that makes them “squishy” called vitreos humour. You also have tear ducts, the retina, the iris, the sclera (the white part of your eye). Everyone thinks your eyes are what makes you see, but it’s actually your brain, mostly. The eyes are just the aperatures.
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Sam Chilka answered on 4 Jul 2012:
Great answers by everyone!
As Samantha says, the brain is actually responsible for “seeing”, as it’s the brain that interprets the light coming into your eyes. For example, your eye has a lens which focuses the light coming in, so the image you see is sharp. And the eye also has a retina at the back which converts light hitting it into electrical signals – like the sensor at the back of a digital camera. The lens “flips” the light coming in, so that the image hitting the retina is upside-down. Your brain interprets the image and re-flips it so that what you see is the right way round again.
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