Seeing is such a big part of everyday life that it requires about half of the brain to get involved.

Seeing is such a big part of everyday life that it requires about half

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During a sight test, health conditions including diabetes and high blood

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A healthy (non-colorblind) human eye can distinguish between 500 shades

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If you placed all the capillaries in your lungs (of which there are

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Eyes are able to process 36,000 pieces of information in a single hour

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As you get older, the lens in your eye grows thicker – this is why

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Although the exact amount has not been agreed upon, scientists generally