Open canthus surgery is a simple and most commonly used lateral canthoplasty, which can permanently enlarge ptosis. However, this operation is largely limited. If the incision of the outer canthus is too large, the vault and bulbar conjunctiva are not relaxed enough, and the incision is forcibly sutured, the red edge of bulbar conjunctiva will appear in the area with wide canthus angle, which will affect the appearance and cause insufficient blepharoptosis. Whether it is good to open the corner of the eye is mainly related to the technical level of the doctor. Hangzhou Time Hospital is a good regular hospital.