The formation of double and single eyelids is genetically determined. For a better visual effect, double eyelid patches or double eyelid surgery can be used to make both eyelids symmetrical. 1. Double eyelid stickers: Using double eyelid stickers can turn a single eyelid into a double eyelid without surgery, but the effect only lasts for a few hours. 2. Double eyelid surgery: To have permanent double eyelids, you can have double eyelid surgery. Currently, the most common methods of double eyelid surgery are threading and incision. The buried line method is more limited, only suitable for people with thin eyelids and no skin laxity and fat prolapse. In contrast, the full eyelid incision has a wider range of applicability. It is recommended that those who are in need of this procedure can choose the appropriate method to improve their appearance according to their situation. It is important to note that the surgery should be performed in a proper hospital by a professional doctor.