Is there an objective standard for what makes an ideal double eyelid? This is a common concern for everyone who requests blepharoplasty or who has already had it done. To be precise, the ideal standard for blepharoplasty is a unification of the subjective and the objective. The standard is measured by the patient’s own feelings, the doctor’s opinion, and the opinion of the people around the patient (including family members, friends, colleagues, and contacts), which we call the three-dimensional standard. No matter how a double eyelid is made, the patient’s own feeling is the most important, because the reason why the patient seeks surgery is for beauty, if she thinks she is not beautiful after surgery, her psychological state can be imagined. On the contrary, if she thinks she is very beautiful after the surgery when others think she is not, it can be said that she has achieved part of the purpose of the surgery. If the patient herself, the surgeon and the people around the patient all think that the surgery is successful and the eyelids look good, then it can be called an ideal state, and if not, it can be called an undesirable state. There are two factors that often contribute to an undesirable state, one is the psychological factor, the psychological state of the surgeon is not normal; the second is the objective factor, the double eyelids do have some shortcomings. Objectively speaking, people’s eyes and facial conditions are different, and the aesthetics of double eyelids are different, so it is difficult to use an objective standard to measure whether the eyelids are satisfactory. For example, some people like wide eyelids and some like narrow eyelids; some like wide inner canthus and some like narrow inner canthus; some like upturned outer canthus and some like parallel outer canthus. However, there are a few things that are consistent: 1. The post-operative eyelids are natural and no artificial scarring can be seen, i.e. no fakes and no artifice. 2. The upper eyelid is flat after surgery, without subcutaneous nodules, and the incision scar is not visible. 3. No post-operative discomfort. The following defects are often objectively undesirable after double eyelid surgery: 1. The double eyelids are too large. 2, double eyelids are too small. 3.The arc of double eyelids is not smooth. 4.The arc of double eyelids is too short. 5.Tight eyes after double eyelid surgery. 6.Scars are obvious after double eyelid surgery, especially at the inner canthus. 7.The eyelid crease line is too shallow or too deep. 8. Persistent swelling after double eyelid surgery, and the swelling does not completely subside after six months. All of the above states can be surgically adjusted again or redone with blepharoplasty to achieve satisfactory results. The general timing of secondary corrective surgery should be between three months and six months after surgery, as it takes three months for the soft tissue surgical trauma to fully swell the tissue and recover. However, in some cases, if the patient is uncomfortable with the unsatisfactory postoperative state and there is a significant deficiency in the surgery, rework surgery can be done early, the sooner the better, when the incision is not firmly healed within 6 days. However, the surgery should be done carefully and with the help of an experienced and senior surgeon in order to have a better chance of success.