1. The external muscles that move the eyes are the strongest muscles in the human body for the job that they have to do. They are 100 times more powerful than they need to be.
2. Blinking helps to wash tears over our eyeballs. That keeps them clean and moist. Also, if something is about to hit our eye, we will blink automatically.
3. Our body has some natural protection for our eyes. Our eyelashes help to keep dirt out of our eyes. Our eyebrows are made to keep sweat from running into our eyes.
4. The cornea is the only living tissue in the human body that does not contain any blood vessels.
5. Can process 36,000 bits of information every hour.
6. The adult eyeball measures about 1 inch (2.5 cm) in diameter. Of its total surface area only one-sixth is exposed - the front portion.
7. In a normal life-span, will bring you almost 24 million images of the world around you.
8. Under the right conditions, can discern the light of a candle at a distance of 14 miles.
9. The reason why your nose gets runny when you are crying is because the tears from the eyes drain into the nose.
10. The eye is the only part of the human body that can function at 100% ability at any moment, day or night, without rest. Your eyelids need rest, the external muscles of your eyes need rest, the lubrication of your eyes requires replenishment, but your eyes themselves "never" need rest.