When you are looking at someone you love, your pupils dilate, they do the same when you are looking at someone you hate.
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Tigers can see 6 times better at night than humans.
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Our eyes are always the same size from birth, but our nose and ears never stop growing.
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The human eye blinks an average of 4,200,000 times a year.
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Poor eyesight (myopia) is associated with higher IQ.
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Shark corneas are used in eye transplants and shark bone marrow can be used to graft human bones.
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In ancient Egypt, priests plucked EVERY hair from their bodies, including their eyebrows and eyelashes.
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Optical illusions occur when what the eyes see conflicts with what the brain expects.
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