Open corner plastic surgery is also called lateral canthoplasty. Director Pan Weifeng introduced that the method of canthotomy is to cut the outer canthus, lengthen the transverse fissure and make the eyes bigger. This kind of lateral canthotomy is called seamless lateral canthotomy because it cuts the lateral mucosa of the eye and can lengthen the eye without worrying about scars. The plastic surgery of the outer corner of the eye is to make the ptosis expand permanently, which is used to correct the ptosis smaller than normal, such as ptosis syndrome or blepharitis caused by trauma and eye diseases.