I. Nasolacrimal duct stent implantation Indications: chronic dacryocystitis, nasolacrimal duct obstruction, nasolacrimal duct stenosis, mucinous cyst of the lacrimal sac, reobstruction after nasolacrimal sac anastomosis, poor results after laser or other modalities, etc. Advantages of surgery: ① It is a new type of interventional surgery, minimally invasive, less painful, less bleeding, and does not change the original anatomical structure. ② No skin incision is made, and no scar is left on the face after surgery. ③ Compared with common lacrimal duct placement, the efficacy is certain and the recurrence rate is low, and the success rate is comparable to that of lacrimal sac nasal anastomosis. ④ Safe and time-saving, no need for hospitalization. Indications for nasal endoscopic lacrimal sac nasal anastomosis: chronic dacryocystitis, acute dacryocystitis, reobstruction after nasal lacrimal sac anastomosis, etc. The advantages of surgery: ① minimally invasive surgery ② no skin incision, no scar on the face after surgery ③ no damage to the inner canthal ligament and canthal vein ④ acute inflammation of the lacrimal sac when feasible nasal drainage ⑤ surgical success rate and external incision method of nasal lacrimal sac anastomosis equivalent (79% ~ 98%) III, lacrimal sac nasal anastomosis lacrimal sac nasal anastomosis for the traditional surgical approach, the efficacy of the exact cure rate is high, the disadvantage is that surgical damage, bleeding more There are incisions on the face and scar left behind.