The cost of opening the outer corner of the eye alone is routinely in the range of 3,000-4,000 yuan, while if it is done together with double eyelid upper eyelid ptosis or opening the inner corner of the eye, that is, when doing the eye synthesis, the cost will be slightly cheaper because it is counting the overall price. Opening the outer corner of the eye is to increase the length of the eye, is to make the eye bigger, routinely is required to do with opening the inner corner of the eye and eyelid down to together, so as to make the eye bigger overall. The outer corner of the eye can only be routinely opened by a maximum of 3-5mm because of the limited distance, and because the outer corner is a mucous membrane and skin suture, it will easily retract. Make sure to fix the external canthal ligament to the periosteum when suturing, which will reduce the tension of the mucocutaneous flap and prevent post-operative retraction.