Fun Facts about Human Eyes

• The eye of a human can distinguish 500 shades of the grey.

• The cornea is the only living tissue in the human body that does not contain any blood vessels.

• The eyeball of a human weighs approximately 28 grams.

• Sailors once thought that wearing a gold earring would improve their eyesight.

• The conjunctiva is a membrane that covers the human eye.

• 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.

• Some people start to sneeze if they are exposed to sunlight or have a light shined into their eye.

• It is impossible to sneeze with your eyes open.

• Blinking helps to wash tears over our eyeballs. That keeps them clean and moist.

• The eyes blink over 10,000,000 times a year!

• Our eyelashes help to keep dirt out of our eyes.

• Our eyebrows are made to keep sweat from running into our eyes.

• The study of the iris of the eye is called iridology.

• Men are able to read fine print better than women can.