The medical term for the transformation of single eyelids into double eyelids is blepharoplasty, or blepharoplasty, commonly known as double eyelid surgery. The eyes are not only an organ of vision, but also an organ of expression, the most expressive part of the body. It is not necessary to have double eyelids to look good, or single eyelids are not beautiful, the key is to see if the eyes can be fully open and fully express feelings, eye beauty lies in the gods, not the single or double eyelids. However, many single eyelids do not open much, the eyelid is thick or the upper eyelid is loose, which not only blocks the eyelashes but also part of the eyeball, resulting in a narrow eyelid fissure and a dull, lifeless look, as if you are always awake. Therefore, the real purpose of blepharoplasty is to widen the eyelids and make the eyes bigger and more lively. The shape and width of the eyelids should be individualized to meet aesthetic standards. (1) What kind of eyes are suitable for double eyelids? Generally speaking, single eyelid eyes with narrow and long cleft, thin and tight upper lid, deep eye sockets and high nasal bridge are good candidates for the surgery and the results are obvious. On the other hand, monolids with short round eyes, wide and short fissures, thick upper lids, loose and sagging skin, or protruding eyes, small eyes, shallow and flat eye sockets, and collapsed nasal bridge are difficult to operate and have poorer results. Eyes with short round eyes, large cleft, protruding eyeballs, or small eyeballs are not suitable for surgery because blepharoplasty has the effect of widening the cleft of the eye, which may turn into “rat eyes” or eyes with a large cleft but small eyeballs after surgery. In addition, strabismus should not be operated on, as the enlargement of the eye fissure will make the strabismus more obvious. In addition, patients with ptosis should not simply undergo blepharoplasty, but should form double eyelids while correcting the ptosis, otherwise an incision scar will be added to the upper eyelid. (2) What are the surgical methods of double eyelid surgery? What are the advantages and disadvantages of each? There are two types of blepharoplasty: the ligature method (also known as sutures, buried lines, and polymer eyelids), which involves no or minimal skin incision, and the incision method. The ligature method is suitable for people who are young, have tight upper lid skin, thin eyelids, wide upper lids, and mild canthus. The ligature method has the advantages of being simple, less invasive, quicker recovery, and can be reworked if the surgery is not ideal, with more room for maneuvering. The disadvantage is that some of the eyelids may fall off and the eyelid may not appear or disappear. The incision method is suitable for those who have sagging upper eyelid skin and need to remove a strip of excess skin, those who need to remove fat from their eyelids, or those who need to have their canthus corrected at the same time. The advantage of this procedure is that it can be used on a wide range of eyelids and can be used on all types of single eyelids, and the resulting eyelid can last a lifetime. The disadvantage is that the surgical method is complicated, not easy to master, time consuming and difficult to modify if the surgery is done badly. (3) What are the criteria for successful double eyelid surgery? The width of the eyelid is moderate, and the lid line is natural and smooth. The eyelids are thin and flat from the eyelid line to the eyelid margin, not too thick. The eyelids are basically symmetrical on both sides, and the shape of the eyelids is natural and beautiful, with no visible artificial traces. The eyelids are significantly larger than before surgery, and the eyes are more luminous without complications or after-effects. (4) Do European-style eyes really look good? European people have wide faces, large orbits, high eyebrow arches, deep eye sockets and thin eyelids, so they look good with wide double eyelids. Oriental people, on the contrary, the cloning of European eyes, nine out of ten look unnatural, not in the West, incompatible, which is beautiful. Oriental people have oriental beauty, cosmetic surgery should also maintain national characteristics and individual features. (5) What is an age-related triangle eye? Age-related laxity of the eyelid skin tissue usually starts at the age of 30 and becomes more pronounced with age, resulting in sagging of the upper lid skin, reduction of fatty tissue within the lid and a triangular-shaped lid fissure.