First, what is the medial canthus “medial canthus” is to cover the medial canthus vertical to the half-moon skin folds, often from the upper eyelid to the medial canthus continuation of the formation, are bilateral. There is a close relationship between medial canthus and racial differences. It is most commonly seen in the Mongolian race in Central, North and East Asia, and is also known as the “Mongolian fold”. The medial canthus is a vertical skin fold, which naturally creates skin tension in the vertical direction, while the fold formed by the blepharoplasty is horizontal, and when the eyes are opened to form the blepharoplasty groove, it also creates tension in the vertical direction. Therefore, the inner canthus blepharoplasty line is formed on top of the redundant skin, and the blepharoplasty groove is often not formed due to the role of tension. If the blepharoplasty is forcibly formed, the tension is too great, causing a feeling of heaviness when the eyes are opened, long-term fatigue, and pseudo-ptosis, as well as the formation of more obvious scars due to the effect of tension. If the blepharoplasty line is formed under the redundant skin, due to the covering of the redundant skin, the inner side of the fold of the eyelid can not be seen, forming the so-called “half double” eyelid, the appearance is not beautiful. Therefore, in the blepharoplasty, such as the heavier canthus, should be in the blepharoplasty at the same time, to be corrected, so that there can be a good blepharoplasty effect, but also can widen the eyelid fissure. Second, the classification of the inner canthus The inner canthus can be clinically divided into simple inner canthus and complex inner canthus. The former is only a canthus, eye crack slightly narrowed, single lid or double, without other deformities; the latter is accompanied by a significant narrowing of the eye crack, eyelid skin and subcutaneous tissue thickening, orbicularis oculi muscle dysplasia, short and narrow eyelid plate, often with ptosis (eyes do not open much). Third, the correction of medial canthus The purpose of correcting medial canthus is to remove the skin folds at the inner corner of the eye, reveal the lake of tears and enlarge the eye crack. Only after puberty when the simple canthus is still obvious will surgical treatment be needed. We usually perform blepharoplasty along with medial canthus enlargement. In mild cases, the skin incision can be closed directly after cutting open the redundant skin, and in more severe cases, a “Z” reshaping operation should be performed. Although the latter may leave a 0.5cm long incision line on the skin of the inner canthus, the eye crack that is widened by the surgery will add a lot of color to the eyes. The treatment of complicated medial canthus should depend on the severity of the local deformity. If the medial canthus is mild and the eyelid is well developed, the medial canthus can be enlarged at the same time as the ptosis is corrected and blepharoplasty is performed. Conversely, the medial canthus should be enlarged first, and ptosis correction and blepharoplasty should be performed after an interval of several weeks. Because of the severity of the medial canthus deformity in the latter case, the Murray method (i.e., Y-V advancement plus double Z reshaping) is usually used. The age of treatment is usually after 6 years of age. Too late can result in secondary conditions such as strabismus, amblyopia, or myopia due to ptosis. When correcting the medial canthus, the surgical level should be: 1. clear. Because of the delicate anatomy of the medial canthus, if you are not familiar with them, you may inadvertently destroy many important anatomical structures and develop irreparable complications, such as breakage of the tear ducts. 2.The local skin looks much, but in reality it is not much, so you should try not to remove the skin tissue during surgery. 3.Surgery can be overkill. 4, and blepharoplasty at the same time, should pay attention to the canthus correction, the upper eyelid skin position changes. Fourth, the inner canthus repair preoperative precautions 1, two weeks before the operation, please do not take drugs containing aspirin, because aspirin will make the function of platelet coagulation reduced. 2.Patients with high blood pressure and diabetes should inform the doctor of their condition during the initial consultation, so that the doctor can confirm the surgical plan. 3, before surgery to determine the health of the body, no infectious diseases or other physical inflammation. 4.Don’t wear make-up before surgery. 5.Women should avoid menstruation. 6, men should quit smoking one week in advance. Fifth, the canthus repair postoperative precautions 1, 7 days after surgery to avoid the surgical site of water. 2, to ensure that the surgical site clean, to prevent infection. If there is a blood crust or secretion on the wound, use sterile saline to wipe it. 3.After surgery, you can apply pressure bandage to the local wound or use ice packs to apply cold compresses, but the pressure should not be large so as not to damage the eyes. Once bleeding and serious hematoma occur after surgery, you should go to the hospital for follow-up. 4.A quiet and comfortable environment should be used for recuperation after surgery. Don’t watch TV or read newspaper within 1 week after surgery. When you are resting in bed, it’s better to lie down in semi-recumbent position (put the pillow up), so as to avoid excessive fatigue of the eyes or low position of the head, which will aggravate the swelling of the wound. 5, the day of surgery, the wound will have some pain, but with the passage of time will gradually reduce. Patients should not rush to take painkillers, because aspirin drugs will aggravate wound bleeding. 6.Avoid eating stimulating food, such as chili peppers. 7.Strictly follow the doctor’s instructions for medication and follow-up.