It closes horizontally instead of vertically, you have a third eyelid imagine. It may seem hard to imagine. In fact, this situation exists in some animals, such as camels, cats and dogs, because it gives them an advantage in their environment.

In our eyes, in the place we call the spring of the eye that little thing is the remnant of the third eyelid we used to have!

Evolutionary biologist Dorsa Amir; He also said this in pink when he spoke about evolutionary garbage that no longer serves a purpose in the human body.

Some characteristics we had in the past but carry traces of in our bodies, even though they serve no purpose now:

• tailbone
• body hair
• the ears move
• Attachment
• Wisdom tooth
• fifth toe
• third eyelid

In some animals, the third eyelid has an advantage.

Third eyelid in animals; It can help keep the eye moist or clean, protect the iris from predators, and provide underwater vision. Camels, for example, can use their third eyelid to from the stormy and sandy environment of the desert they are protected.

In humans, however, the third eyelid, called “plica semilunaris”, does not exist in its current form. It has no benefits or features. It’s just there. It’s not exactly an eyelid anyway. A little piece of it was left behind.

Although it is not clear why the plica semilunaris atrophies over time, it may be due to the environment in which people live and changes in their physiology. may have made this tissue redundant It is estimated.

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