40 Crazy Facts About Eyes

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21The visual centres in the brain are located at the lower back part of your head. This is why people with head injuries can sometimes experience temporary blindness.

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22Tetrachromacy is a rare genetic mutation occurring in 2% of women. It gives them an extra retinal cone, allowing them to see 100 million colours.

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23Staring directly into the sun will burn a spot in the retina, causing permanent blindness. This is called solar retinopathy.

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24Iris pigmentation develops over the first year of life. This means our eyes are darker now than they were when we were newborns.

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25Our eyeballs grow just like the rest of our body. At birth, they are roughly 16 millimetres wide; by puberty, they will have grown to a maximum width of 24 millimetres.

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