Conjunctivitis, bulbar conjunctival tension increased, sustained stimulation. The closer to the capillaries in the outer corner of the eye, the more serious the congestion. If the bulbar conjunctiva is not pulled, it means that the outer corner of the eye has no effect. Maybe the knife in the outer corner of the eye is just an excuse for surgery. Due to the limited extensibility of bulbar conjunctiva, the opening range is generally less than 2mm. In fact, the 2mm opened by the traditional lateral canthus technique was quickly retracted and eliminated within 20 days after operation. The newly opened skin of the outer corner of the eye pulls the bulbar conjunctiva, which is the core performance of the outer corner of the eye failure. Tension causes bulbar conjunctiva ectropion. The longer the outer canthus is opened, the greater the tension of bulbar conjunctiva, and the more obvious the following symptoms. The contracture of the incision of the outer corner of the eye leads to the entanglement of the incision, forming a hypertrophic scar, which leads to the inability to open the outer corner of the eye; The incision of the outer corner of the eye is retracted-the opened outer corner of the eye is closed to varying degrees, and even the original outer corner of the eye is shortened.