The inner and outer corners of the eyes are called the inner and outer canthus in ophthalmology. Due to ethnicity, it is common for Chinese people to have an inner canthus, which is a vertically oriented skin crease in the inner canthus that obscures part of the inner canthus, making it appear that the lid fissure is short, making it difficult to open the eyes, or even causing the eyelid to turn inward and reverse the eyelashes, and causing fear of light and tears. Correction of the medial canthus can indeed lengthen the eyelid and improve its appearance. However, the development of minimally invasive techniques has greatly reduced the chance of scar formation. As long as the indications are properly selected, the surgical design is reasonable, the operating technique is skillful, non-invasive sutures are used, and anti-scar medications are applied after surgery if necessary, there is generally no significant scarring. Of course, it is also necessary to consider whether the patient has a scarring body before surgery. I have always been conservative about opening the outer corner of the eye, because on the one hand, I sometimes see cases where the outer canthus is scarred, the eyelid is ectropioned and congested, causing a lot of trouble for the patient. In addition, due to the limitations of the lateral orbital rim, even surgical canthoplasty is limited, so I generally do not recommend canthoplasty except for certain canthal deformities that require surgery.