AIM: To evaluate the therapeutic efficacy of Nd:YAG laser on lacrimal duct obstruction and the different efficiency of obstruction on different location.

METHODS: Totally 920 eyes(840 patients)with no dacryocystitis received Nd:YAG laser treatment, including 134 eyes with lacrimal canaliculus obstruction and 786 eyes with naso-lacrimal duct obstruction. Every case received 4 days' lacimal duct wash by Poly Pred or Tobradex. Patients in two groups were followed up for 3 months.

RESULTS:Total efficiency was 76.2%. Efficiency of naso-lacrimal duct obstruction group was 77.2%(607 eyes), which was obviously higher than 70.1%(94 eyes)in lacrimal canaliculus obstruction by one point group.

CONCLUSION:Nd:YAG laser can be suggestively applied in treatment on lacrimal duct obstruction, especially can be used in naso-lacrimal duct obstruction due to its simplicity, economy, practicability, less side effect and complication.