Why the Chinese they have slanted eyes?

You'll understand the principle will be dealing with an issue that many people are asking the Chinese and China in general!Preconceived ideas and prejudices between the goal will be to provide some clear and concise answer to the extent possible, to hope you entertained while educating you!

We start this week with a classic:

Why the Chinese they have slanted eyes?

This question is often asked and nobody really bothers to re there lay seriously. We will try here to clarify the subject of that particular physical trait of Chinese and Asians in general. 
Firstly, it seems good to explain that slanted eyes are causing a small mass of fat formed at eyelid hiding épicanthique fold(between the arcade and the eyelid). The Chinese have, in fact, the épicanthique fold at the eyelid crease merges with the lash line.We then told the slanted eyes they have single eyelid unlike Western which show a double (the fold épicanthique distinguished above the lash line).

 

The slanting Chinese eyes due to weather

Ancestors of the inhabitants of Siberia and countries with arid climates, Asians have acquired this physical trait for the sole purpose of protection from cold winds and strong glare of the sun on the snow. Épicanthique the fold would be the consequence of the adaptation of the human body to this climate. Despite the migration of the people to the south , this genetic modification would have passed from generation to generation. It should also be noted that the fold of the eye is less marked in South Asia than in the north where the harsh climate requires greater protection .

A competition grimaces originally slanted eyes

If you are fond of unusual anecdotes, aware that it is reported that the eyes slanted come from a contest grimaces . The winner would have won the contest thanks to wrinkling his eyes. Fascinated with this grin, his countrymen would have squinted in turn continuously until this feature is part of their genetic code.

The scientific argument is nevertheless most likely. Slanted eyes of the Chinese is a purely genetic trait of the physical to the environment . This fold, appeared naturally to protect rights, would then developed genetically engineered, making a physical appearance typical of Asia and especially China.

Before / after

Our personal experience in China has often demonstrated that the physical aspect was not accepted by all or any. Thus we see often (including club) amazing physical changes, blamed a makeup very sophisticated. Of falseeyelashes to lengthen the look of the white pencil under the eye to enlarge the eyes and lens color or not allow young Chinese to Westernize the most of their appearance. Change is often striking!

And you, which of these explanations seem most plausible?