Our eyes are one of the most fascinating and complex parts of the body.

Almost every animal in the animal kingdom relies on them everyday, but how much do we really know about eyes, and how they work?

If you like eye facts, check out some of ours below.


  1. Sitting too close to a TV won’t give you square eyes.
  2. The four-eyed fish can see both above and below water at the same time.
  3. Oily fish, vitamin A and vitamin C all help to preserve good eyesight.
  4. When working at a computer, you should follow the 20-20-20 rule – look at something twenty feet away from your computer every twenty minutes for twenty seconds.
  5. Snakes have no eyelids, just a thin membrane covering the eye.
  6. Eye transplants are currently impossible due to the sensitivity of the optic nerve.
  7. Only one sixth of the human eyeball is exposed.
  8. Pirates believed that wearing gold earrings improved their eyesight.
  9. Snakes have two sets of eyes – one set used to see, and the other to detect heat and movement.
  10. If you lined up all the eyelashes shed during one human life, they would measure 98 feet long.
  11. A scallop has around 100 eyes around the edge of its shell to detect predators. 
  12. You see things upside down – it is your brain which turns the image the right way up.
  13. The space between your eyebrows is called the Glabella.
  14. Contrary to urban myth, contact lenses cannot become ‘lost’ behind your eye due to the structure of your eyeball.
  15. Goats have rectangular pupils to give them a wide field of vision.
  16. Everyone has one eye that is slightly stronger than the other.
  17. The eyeball weighs around 28 grams.
  18. Although the function of tears is to keep eyes clean, scientists don’t understand why we cry when we are upset.
  19. Owls are the only bird which can see the colour blue.
  20. Your nose gets runny when you cry as the tears drain into your nasal passages.
  21. About half of the human brain is dedicated to vision and seeing.