To turn single eyelids into double eyelids, blepharoplasty, i.e. double eyelid surgery, can usually be performed, including the incision and buried line methods, which require designing the proportion of double eyelids and removing excess fat and loose skin according to the shape of the eyes, the degree of swelling of the upper eyelids and the width of the eye fissure, as follows: 1. Buried line method: less traumatic, almost scarless, and forms a more natural heavy eyelid line, but not suitable for complex situations such as more loose skin This is the most common method of blepharoplasty, including the lid margin incision and the lid line incision. The trans-lid margin incision has the advantage of a concealed incision, but it is more inconvenient when dealing with complex conditions such as loose skin, severe “swollen eyes” and ptosis, so the trans-lid line incision is now more widely used. In addition, the double eyelid patch is a more common method, but it is not recommended as it can cause the skin to sag over time, resulting in triple eyelids.