AIM: To discuss the advantage, improvement, safety and effectiveness of improved endoscopic dacryocystorhinostomy in the treatment of chronic dacryocystitis.

METHODS: Eighty cases of chronic dacryocystitis with two different surgical methods were randomly selected and divided into common endoscopic dacryocystorhinostomy(80 cases with 82 eyes)and improved endoscopic dacryocystorhinostomy(80 cases with 84 eyes)according to operation. Compared to observe cure rate, improvement rate, total effective rate and patient satisfaction of two kinds of surgery by the last follow-up.

RESULTS: The cure rate, improvement rate, total effective rate and satisfaction rate were respectively 75.6%, 17.1%, 92.7% and 73.8% for Group A, 90.5%, 5.9%, 96.4% and 92.5% for Group B. Differences between the cure rate, improvement rate and total effective rate between two groups had statistical significance(P<0.05).

CONCLUSION: The cure rate and improve symptom of improved endoscopic dacryocystorhinostomy is superior to the common endoscopic dacryocystorhinostomy, safe and effective.