EyeWiki:Featured article/August 15, 2020

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Featured Article for August 14, 2020

Secondary Acquired Nasolacrimal Duct Obstruction

Secondary acquired nasolacrimal duct obstruction (SANDO) is an obstruction of the nasolacrimal duct caused by a secondary etiology, as opposed to the idiopathic primary acquired nasolacrimal duct obstruction (PANDO). To be classified as SANDO, a specific cause must be identified. Epiphora is a very common complaint, and nasolacrimal duct obstruction (NLDO) is the most common cause of persistent epiphora. The incidence of NLDO is reported as 20.24 per 100,000. In this incidence study, NDLO accounted for 31.8% of all chronic epiphora and 67.6% of all tear drainage pathway obstructions.