A Comparative Study of Two Endoscopic Operations for Lacrimal Duct Obstruction

Inclusion Criteria: * Clinical diagnosis of Nasolacrimal Duct Obstruction based on a clinical of epiphora and purulent secretion, another punctiform orifices with reflux in subsequent flushing in lacrimal passage irrigation; * Must be able to withstand surgery * At least 18 years old * NO lacrimal tumor and acute inflammation * Nasolacrimal duct obstruction in digital subtraction dacryocystography * A sufficient level of education to understand study procedures and be able to communicate with site personnel and adhere to the follow-up; * Accepted informed consent verbally and in writing Exclusion Criteria: * The Poor Health * Be allergic to anesthetics * Lacrimal duct abnormalities * Lacrimal tumor and acute inflammation * Children * The same Surgery failure before Exit Criteria * Postoperative infection and persistent inflammation * Operation failure.