Why Do Chinese, Japanese and some other Asian countries have slanted eyes?
It’s an eyelid fold caused by a genetic mutation. Evolutionary Genghis Khan drawn with an epicanthic fold One hypothesis as to why epicanthic folds came about involves the climates in which populations expressing them arose. Sunlight reflects more intensely off light colored surfaces, such as those prevalent in snowy regions or savannahs and deserts. The theory is that an epicanthic fold in such an environment would protect the eyes from extra UV radiation.[citation needed] The trait may also be useful against strong winds and cold weather such as the ones on the Central Asian steppes.[citation needed] For instance the country of Mongolia is hot in the summer and extremely cold in the winter, with January averages dropping as low as -30°C (-22°F).[4] The country is also subject to occasional harsh climatic conditions known as zud. The capital Ulaanbaatar has the lowest average temperature of any national capital in the world. Mongolia is high, cold, and windy. It has an extreme contine
