Can open canthus be permanent? Will there be sequelae? Here, eye plastic experts explained that the operation of the outer corner of the eye can permanently enlarge the ptosis, but the incision of the outer canthus is too large and the vault and bulbar conjunctiva are not relaxed enough. However, if the incision is forcibly sutured, the red edge of bulbar conjunctiva will appear in the area with large canthus angle, which will affect the appearance and cause the closure of ptosis. If you have such sequelae, it is definitely not what you want, so there is a limit to opening your eyes. You can't just let the doctor open his eyes. The focus of the outer canthus surgery is mainly to correct the width of the inner canthus, split the upper eyelid margin layer by layer, cut the outer canthus from the temporal side of the upper lacrimal point to the upper eyelid margin, so as to make the eyelid fissure expand permanently and correct the problem of epicanthus. The eyelid retractor rotates the upper eyelid, and the operation of the outer corner of the eye is to make a wedge-shaped incision from the eyelid margin to the vault in the center of the upper eyelid to cut off the full-thickness tarsal plate. The included angle between incisions is determined by the length of expanded eyelid fissure. The larger the angle, the larger the scope of blepharoptosis after operation. On the contrary, the smaller the included angle, the smaller the scope of palpebral fissure expansion.