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on eyes

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Did you know...?

  1. Eyes convert light into electro-chemical impulses in the neurons of the brain.
  2. Healthy eyes are so sensitive that they can detect the light of a candle 1.5 kilometers away.
  3. The human eye can distinguish about 10-million different colours.
  4. The cornea is the only living tissue in the human body that does not contain blood vessels.
  5. All babies are colour blind when they are born.
  6. Our eyes are protected by natural physical characteristics of the human body. Eyelashes help to keep dirt out of our eyes and eyebrows prevent excessive perspiration from running into our eyes.
  7. Blinking helps to wash tears over our eyeballs, which keep them clean and moist. In addition, it provides a perfect optical surface to refract light to form an image in the eye.
  8. The cornea of sharks have been used in eye surgery, since it is similar to a human cornea.
  9. A human eyeball weighs approximately 28 grams.
  10. The eyes of babies do not produce tears until the baby is approximately six to eight weeks old.
  11. When you cry, the tears from your eyes drain through the nose, which causes a runny nose.
  12. Human eyes contain a small blind spot where the optic nerve passes through the retina. Your brain uses the information supplied by the other eye to fill in the missing information, so the blind spot is rarely noticed.
  13. Each eye has more than 2-million working parts.
  14. Human eyes remain about the same size from birth to old age.
  15. Human eyes can process 36,000 bits of information every hour.
  16. Only about one-sixth of the human eyeball is exposed to the outside world.
  17. Red and green are the two most commonly-confused colours among colour-blind people.
  18. Colour blindness is ten times more common in men than in women.
  19. The eye is the only part of the human body that can function at 100% ability at all times without rest.
  20. Our eyelids and the external muscles of the eye need rest, but the eye itself never needs rest.
  21. It is impossible to sneeze with your eyes open.
  22. The human eye contains about 120-million colour-insensitive rods for night vision and 8-million colour-sensitive cones for day vision.
  23. About 50% of our brain is involved in the seeing process.
  24. Our eyes contribute about 85% of everything we know.
  25. The retina of the eye has a neural mechanism, known as Troxler's phenomenon, that ignores the shadow cast onto it by the vessels supplying it with blood. If this was not the case, you would be constantly aware of lines in your everyday visual field.