Unexpected Fun Facts About Eyes--- I. Changing Eyes

The eye is the window to the world and the door to the soul. But how much do you know about it? Do you know how many eyes are there? Do you know that brown eyes can turn into blue eyes forever? You know that some colors do exist, but we can't see them? From today on, we'll give you 50 interesting and unexpected fun facts about eyes. We plan to finish the topic in five parts. OK, let's go to the first part--Changing Eye. 

Changing Eyes 

1. Humans The cornea is very similar to the shark, so the latter is often used as a replacement for the cornea in the human eye during surgery. 

2. People and dogs are the only species that will make judgments in the other's eyes. Dogs do this when they communicate with humans. 

3. Unless you are specially trained, you may not be able to sneeze with your eyes open.

4. Pirates wear gold earrings because they believe this will increase their vision. 

5. In a television interview, an American prisoner of war in Vietnam repeatedly smashed the Morse code torture to hint at the US military's experience in Vietnam. 

6. When looking at the person you like, the pupil of the person will expand by 45%.

7. All newborn babies are color blind. When the child is born and opened his eyes, their world is mainly composed of three colors: black, white and gray. 

8. Scientists at the University of Copenhagen found that blue-eyed people have a common ancestor. The ancestors showed blue variations and lived between 50,000 and 10,000 years ago. Before that, everyone was brown eyes. 

9. The human eye can distinguish between 500 different shades of gray. 

10. There are approximately 107 million light-sensitive cells inside each eye. 

11. One in every 12 men suffers from color blindness.

12. People with brown eyes are actually brown pigments that cover the blue, and a laser surgery can permanently turn brown eyes into blue eyes. 

13. Some real colors are invisible to humans, and they are called "invisible colors." 

14. About 2% of women develop a rare genetic mutation that causes an extra cone to appear in their eyes, which can distinguish 100 million colors. 

15. Some people are born with two different colored eyes, which is called "Iris heterochromia." 

16. The most eye color in the world is "brown". 

17. The visual cell color of the color in the human eye is only sensitive to electromagnetic waves of three wavelength ranges of "red, green and blue", and the color seen by humans is a mixture of these three wavelengths.

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