What is the function of eyebrows?

Protect your eyes. Eyebrows are a barrier to protect the eyes, which can prevent the erosion of rain and sweat. The eyebrows form a barrier above the eyes, and the wind can block the dust; When it rains lightly, stop the rain from flowing into your eyes. In summer, there is a lot of sweat on my forehead, but the sweat will not flow into my eyes, which is also the credit of my eyebrows.

Extended data:

It is also reasonable to know a person's physical condition through eyebrows. There is a cloud in Huangdi Neijing: "Those who have beautiful eyebrows are full of yang and blood, and those who hate eyebrows are few." It can be seen that the eyebrows are rich, dense and moist, reflecting the vitality of the meridians of the foot sun; If the eyebrows are thin and short, thin and light, and fall off, it is a symbol that the sun passes through insufficient blood gas. Thick eyebrows indicate that the kidney is full and strong; But thin and weak eyebrows indicate weakness. If kidney qi is sufficient, sexual desire will naturally flourish. That's the truth.

The ancients in China believed that it was unlucky to have eyebrows with scattered wealth, crossed eyebrows, thin yellow eyebrows, crossed eyebrows, messy eyebrows, pointed eyebrows and heavy eyebrows.

References:

Baidu encyclopedia-eyebrows