Abstract: Abstract: Objective　To analyze and compare the results of lacrimal dilation tubes and lacrimal drainage tubes in the treatment of lacrimal drainage system obstruction, and further clarify their indications. Methods　Data of 317 patients included 354 eyes with lacrimal duct obstruction underwent lacrimal duct laser and implantation of lacrimal artificial tubes in Tianjin Eye Hospital from January 2013 to September 2019 were retrospectively analyzed. In all patients, 103 patients (111 eyes) were male, 214 patients (243 eyes) were female, and the mean age was (47.4±15.6，range, 20-84) years. According to the different obstruction sites, the patients were divided into simple nasolacrimal duct obstruction group (simple group) and complex lacrimal duct obstruction group (complex group). According to the different types of artificial lacrimal duct placement, each group was subdivided into two groups, the dilated duct group and the drainage duct group. There were 159 eyes in the simple group (107 eyes with dilator tube and 52 eyes with drainage tube) and 195 eyes in the complex group (98 eyes with dilator tube and 97 eyes with drainage tube). Results　There were no significant differences in gender, age, course and Munk grade between the two subgroups (P＞0.05). In the simple nasolacrimal duct obstruction group，the cure rate and effective rate of dilation tube (88.79% , 95.33%) were significantly higher than those of drainage tube (71.15%, 82.69%), (χ2=7.716 and 5.473 respectively, P＜0.05). In the complicated lacrimal passage obstruction group, the cure rate and effective rate (51.55%, 71.13%) were significantly higher in drainage tube than those of dilation tube (31.63%, 56.12%) (χ2=7.961 and 4.745 respectively, P＜0.05). The incidence of nasoenoic acid distension was significantly higher in dilated tubes than that in drainage tubes (P＜0.05). Conclusion　Lacrimal duct laser with implantation of artificial lacrimal tubes is efficient for obstruction of lacrimal drainage system obstruction. The dilation tube is more suitable for patients with simple nasolacrimal duct obstruction, while drainage tube is more suitable for patients with complication lacrimal duct obstruction.

Key words: lacrimal duct obstruction, catheters, indwelling, laser therapy, lasers,solid-state, lacrimal dilation tube, lacrimal drainage tube, laser lacryocystoplasty, lacrimal duct recanalizatio