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Content: The correct name for Asian slanted eyes is “Mongolian bridle,” “epicanthic fold,” or “epicanthus.” It is different from a Westerner’s eye because, in the upper eyelid, there is a fold that covers the inner corner of the eye, causing the caruncle of the lacrimal to be covered and to descend to the bottom to finish joining with the skin of the face. To know why Asians have slanted eyes, there have been many theories and, the first of them believed that it was due to the bone structure of the people in this part of the world. It was believed that Asians had the hole where the eyeball is installed in almond shape and, therefore, externally, the eyes were seen with this peculiar shape. However, this theory was discarded as soon as it was discovered that the ocular structure is exactly the same in all humans: Eastern or Western. The most compelling explanation
There is another theory that, so far, is the most accepted by the scientific community. Asians are believed to have slanted eyes out of a need to adapt to the environment in which they settled. When groups of humans arrived in the Asian part of the world, there were strong climatological contrasts with periods of intense luminosity and, others, with extreme cold that led to very strong winds and storms. Therefore, it is considered that genetics evolved to allow these Homo sapiens to live better in their environment and survive.