The Mongoloid race is considered one of three great races. It has many distinctive features that set it apart from other human populations. Looking at the indigenous people of most regions of Asia, it is difficult not to notice that their eyes are much narrower than those of people from Europe or Africa. Why Mongoloids have such eyes - further in the review.
Even from school, many should remember a simple explanation for the narrow eyes of the Mongoloid race. In fact, the size and shape of the eyes (as such) in Asians are no different from other people. The characteristic "narrowness" is due to the peculiarity of the fold of the upper eyelid, namely, the epicanthus, which has denser (compared to representatives of other large races) fatty layer covering the lacrimal iron.
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What is this epicanthus for? Evolution is generally such a thing, because of which nothing just happens. Every feature of a living organism is the result of adaptation to the environment. For example, a person's upright posture. It is one of the most striking examples of adaptation. Black skin and the reasons for the enlargement of the sweat glands in the Negroid race are also quite obvious. Even a large human brain is the result of the organism's adaptation to the environment.
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Modern anthropologists believe that the modified epicanthus in Mongoloids is an example of defensive adaptation. Most likely, in this way, the eyes of the distant ancestors of the inhabitants of Asia adapted to the harsh steppe climate: bright sun and a large amount of dust, which inevitably fell into the lacrimal canal, causing unpleasant effects.
You can also read about why do Africans have dark skinif everything dark is heated much more strongly in the sun.
A source: https://novate.ru/blogs/281219/52896/