Double eyelid surgery, also known as blepharoplasty, is based on the aesthetic principle of surgically modifying and reorganizing the physiological structure of a single eyelid to give it the appearance of a heavy eyelid, making the eyes more bright and flexible and the appearance more handsome and clear. There are three common surgical methods, including the buried double eyelid, Korean three-dot double eyelid, and full-cut double eyelid, while the nano scarless double eyelid belongs to the buried double eyelid. It is suitable for single eyelids with large lid fissures, thin eyelids, no bloating, no laxity of the eyelid skin and normal tension, and no inner canthus. However, nano scarless double eyelid is more of a gimmick because a truly scarless double eyelid surgery is almost an impossible task, whether you choose to cut or not, the surgery will leave traces. Depending on the body type of each individual, visible or inconspicuous marks will eventually form, but complete lack of marks cannot be guaranteed. In general, double eyelid surgery is performed clinically using the incision method. Through various methods and techniques, most candidates can basically achieve no marks when their eyes are closed, but that’s about it.