What is chronic dacryocystitis? Caused by obstruction or narrowing of the nasolacrimal duct, this is a relatively common eye disease that occurs in middle-aged and elderly women, and is more common in rural and remote areas. It is commonly caused by trachoma, lacrimal trauma, rhinitis, nasal septum deviation, nasal polyp, inferior turbinate hypertrophy, etc., which block the nasolacrimal duct and prevent tears from draining out and remain in the lacrimal sac for a long time. The performance of tear overflow, mucus or purulent secretions from the tear dots outflow and other symptoms. Clinical manifestations: 1, tear overflow, conjunctival congestion in the inner canthus, skin often with eczema. 2. Squeezing the tear sac with fingers, mucus or purulent secretions flow out from the tear dots. 3. Due to the accumulation of secretions, the lacrimal sac gradually expands, and the ligament of the medial canthus shows a sac-like bulge below. Treatment: 1, to the disease soon nasolacrimal duct is not completely blocked cases, can point antibiotic eye drops, 4-6 times a day, point before squeezing clean secretions, do tear duct flushing, after flushing inject a small amount of 0, 25% chloramphenicol solution plus 0, 5% cortisone and 1: 5000 chymotrypsin, at the same time should be treated nasal cavity disease. 2.If the nasolacrimal duct is only partially narrowed, try to do lacrimal tract exploration or nasolacrimal duct intubation. 3, tear point and lacrimal duct normal, can do lacrimal sac nasal anastomosis. 4, if the tear sac is excessively narrow, or the patient is old and frail, or after the injury combined with serious scar, feasible tear sac removal. Advantages of nasal endoscopic lacrimal sac nasal opening: 1, intranasal surgery, no scar on the face. 2.Minimally invasive, less bleeding, good surgical field of view, fast recovery, and exact efficacy.