#13...facts about human eyes

read this facts if you want your eyes in a good condition

• We should never put anything in or near our eyes, unless we have a reason to use eye drops. We would only do that if our doctor or parent told us to use them.
• 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.
• 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.
• Our eyes are very important to us, and we must protect them. We don't want dirt, sand, splinters or even fingers to get in our eyes. We don't want our eyes to get scratched or poked. That could damage our sight!
• The study of the iris of the eye is called iridology.
• The shark cornea has been used in eye surgery, since its cornea is similar to a human cornea.
• The number one cause of blindness in adults in the United States is diabetes.
• The eyeball of a human weighs approximately 28 grams.
• The eye of a human can distinguish 500 shades of the gray.
• The cornea is the only living tissue in the human body that does not contain any blood vessels.
• The conjunctiva is a membrane that covers the human eye.
• Sailors once thought that wearing a gold earring would improve their eyesight.
• Research has indicated that a tie that is on too tight cam increase the risk of glaucoma in men.
• People generally read 25% slower from a computer screen compared to paper.
• All babies are colour blind when they are born.
• A human eyeball weighs an ounce.
• If the lens in our eye doesn't work quite right, we can get glasses to help us see. Glasses have lenses in them that work with our eye's own lens to help us see better.
• Babies' eyes do not produce tears until the baby is approximately six to eight weeks old.
• The reason why your nose gets runny when you are crying is because the tears from the eyes drain into the nose.