1. Design Principles The principle of harmony and bilateral symmetry should be followed to design a personalized but aesthetically pleasing eyelid shape based on the age, personality, occupation, facial shape, eye shape and proportional relationship of the various facial organs of the candidate. The width of the eyelid is the distance between the eyelid line and the upper lid margin, and can be divided into three types: wider eyelids are those with a width of 8mm or more, which are suitable for rectangular faces, strong personalities and a few dancers and theater performers; moderate eyelids are those with a width of 6-8mm, which are suitable for most patients; and narrower eyelids are those with a width of 5mm or less. This is suitable for people with small lids and those who do not want to be noticed as having a blepharoplasty. The three more recognized types of blepharoplasty are broad-tailed, parallel, and crescent. This design is suitable for the majority of single-lid patients; the parallel shape means that the crease is parallel to the upper lid margin and is particularly suitable for those with short lid fissures; and the crescent shape means that the crease is wider in the middle, which is rarely used clinically. In the case of thin upper lids, sutures or buried sutures can be chosen for single lids without skin laxity.