Abstract: Objective　To compare the clinical effects between modified nasal endoscopic dacryocystorhinostomy and modified external nasal dacryocystorhinostomy.　Methods　Eighty-four patients with chronic dacryocystitis in our hospital from January 2013 to December 2017 were randomly divided into two groups: an observation group (n=44, treated with modified nasal endoscopic dacryocystorhinostomy) and a control group (n=40, treated with modified external nasal dacryocystorhinostomy). The patients were followed up for 12 months to observe the cure rate, effective rate, operation time and the incidence of complications.　Results　In the observation group, the cure rate  was 91.5%, the effective rate was 97.7%, the average operation time was 40 minutes, and the incidence of complications was 2.3%. In the control group, the cure rate was 81%, the effective rate was 90.5%, the average operation time was 60 minutes, and the incidence of complications was 9.5%. There was significant difference in curative effect between the two groups (P<0.05).   Conclusions　Modified nasal endoscopic dacryocystorhinostomy in the treatment of chronic dacryocystitis has the advantages of high clinical effect, short operation time, few complications and high patient satisfaction, which is worth to be promoted.

Key words: Chronic dacryocystitis;　Nasal endoscope;　Modified nasal dacryocystorhinostomy, Clinical effect