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1. Eyes are thought to have first developed in animals, in a very basic form, around 550 million years ago.
2. The world’s most common eye colour is brown.
3. Your eye is the fastest muscle in your body – hence why when something happens quickly, we say ‘in the blink of an eye!’
4. You see with your brain, not your eyes. Our eyes function like a camera, capturing light and sending data back to the brain.
5.Dogs can’t distinguish between red and green.
6.We have two eyeballs in order to give us depth perception – comparing two images allows us to determine how far away an object is from us.
7.Eye colour is determined by the amount of melanin in your iris.
8. 20/20 vision simply means that you have normal vision.
9. Your eyes become tired when you read or stare at a computer, this is because you blink less often.
10.Although our nose and ears keep growing throughout our lives, our eyes remain the same size from birth.
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Fact source: http://eyecare.lenstore.co.uk/101-amazing-eye-facts