Many candidates may wonder how double eyelids are formed through surgery. First, let’s understand why double eyelids form. Medically, the muscle that opens the eyes is called the levator muscle. In people with congenital double eyelids, in addition to the fibers of the levator muscle attaching to the upper edge of the eyelid for opening the eyes, there are also some fibers that pass forward through the orbicularis oris muscle, attaching to the skin of the upper eyelid at a distance of 4-7mm from the eyelid margin. When the eyes are opened and the levator muscle is contracted, the skin in this area is pulled upward, while the upper part of the skin is relatively sagging, so a skin fold is formed, which is the blepharoplasty crease, also known as double eyelids. Those with single eyelids generally have no fibers attached to the eyelid skin and no folds appear. Any method of double eyelid formation – surgical or non-surgical – is designed to create this connection, and without the connection between the skin and the levator muscle, there is no double eyelid. As an example, if a thin curtain is hung, and a thread is used to secure the lower half of it at a certain point, and when the securing thread is lifted upward, a crease appears in the lower half of the curtain. When the curtain is lifted upwards, the lower part of the curtain becomes wrinkled. When the curtain is lifted upwards, there is a gap from the ground, which is the reason why the eyes become bigger after double eyelid surgery. However, if the curtain is wide, when the curtain is pulled up, the upper part of the fixation point hides the crease. This is the reason why people with loose eyelids are less likely to have double eyelid surgery with the suture or submerged eyelid method. If the curtain is a very thick quilt, and the curtain is still pulled up at the same height and fixed point, you will notice that the upper part of the curtain will bulge into a thick bag, and the lower part of the curtain will appear wider than when it is a thin quilt, which is why people with thick eyelids will have to have their fat and muscle removed during the surgery, and their eyelids will be designed to have a lower line. How many types of double eyelids are there? Parallel type: The double eyelid is essentially parallel to the lid margin of the upper eyelid. The blepharoplasty line is designed so that the outer side does not exceed the outer corner of the eye. This shape is suitable for women with larger eyes, higher brow arches, eyebrows farther from the eyes, and thin upper eyelids. Open Fan: This is also one of the most classic double eyelids, similar to the “peach blossom eyes”, which is very popular among young girls. It is characterized by narrow inside and wide outside, suitable for eyebrows and eyes with moderate distance, thin eyelids, the horizontal axis of the eyes and the ground plane at a certain angle, the outer corner of the eye is slightly upward, there is the feeling of radiant, very God look. Wide inside and narrow outside: Suitable for those who do not have inner canthus, and the distance between eyebrows and eyes is relatively close, which is more common among western women. If it is more serious, it will form a “triangular eye” appearance. Flat-fan: Combines the characteristics of both parallel and open-fan double eyelids, with the inner half of the eyelid being mildly open-fan, while the middle and outer sides are mainly parallel. Many women now favor this shape. European type: This is a double eyelid that is extremely wide and has all the fat removed. Basically, it is only suitable for the European facial bone structure, which is also determined by the physiological anatomy of their eyelid lids. Also, they have extraordinarily high brow arches and their eyebrows are close to their eyes, thus the double eyelids tend to be wide and exaggerated. But this is not very suitable for Oriental girls.