Total double eyelid incision is one of the surgical methods of double eyelid, and flat fan-shaped and fan-shaped are two different forms of double eyelid.

The fan-shaped double eyelids are from the head to the end of the eye, and the folds of the double eyelids gradually widen, and the fold line of the head is within the "skin edge of the inner corner of the eye".

Flat fan-shaped double eyelids are between parallel and fan-shaped, which is a combination of the two. The folding line of the flat fan-shaped double eyelid is a shape that comes out slowly along the "skin edge of the inner corner of the eye".