The formation of single eyelid and double eyelid is related to one levator palpebrae superioris muscle in human upper eyelid. The formation of double eyelids is due to the fact that the levator palpebrae superioris muscle has fibers extending under the skin, and the muscle contraction causes the skin at the attachment to shrink, which constitutes skin folds, that is, double eyelids, commonly known as double eyelids; The single eyelid lacks this levator muscle fiber attached to the skin, so there is no fold. If a person's genotype contains the dominant gene A that controls double eyelids, his trait should generally be double eyelids. However, in the process of individual development, due to the modification of other genes or the influence of complex factors such as internal and external environmental conditions, the development of levator palpebrae superioris muscle fibers may be incomplete, which may lead to one eye being a single eyelid and the other eye being a double eyelid; Others show double eyelids at a certain stage and single eyelids at a certain stage.

From the above analysis, we can draw a conclusion that dominance and invisibility are relative, and dominant expression is conditional, not absolute.

treatment: 1. Have a good rest. Avoid staying up late! !

2。 Diet frequency. Don't break three meals, don't deal with it, be full. Eat more meat and protein-rich food.

3。 Double eyelid surgery, you can go to Junmei to be double eyelid surgery.