1. The cornea is the only part of the human body that has no blood supply.
2. The average adult blinks at a rate of 10 to 20 times per minute. With an average of 4,200,000 blinks a year.
3. Human's are the only animal on the planet to show the white of their eyes.
4. Vastly more men suffer colour blindness than women. All babies are colour blind when they are born. The primary cause of blindness in adults in the United States is diabetes.
5. The human eye can distinguish 500 shades of the gray and can detect over 10 million colors.
6. Involuntary eye muscle spasms are a symptom of those suffering with blepharospasms.
7. An average adult eye weighs approximately 1 oz.
8. A fingerprint has 40 different unique characteristics an iris has 256, hence the growing use of iris scans for security purposes.
9. Is about 100,000 times more sensitive to light in darkness than they are in bright daylight. People with blue eyes are better able to see in the dark than people with darker ones.
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