A blocked tear duct is a partial or complete blockage in the pathway that carries tears from the surface of the eye into the nose. Dacryostenosis; Blocked nasolacrimal duct; Nasolacrimal duct obstruction (NLDO).
In 6% of all newborn babies, a portion of the tear duct does not form properly, causing a blockage of the tears with no place for them to drain.
Many cases cannot be prevented. Proper treatment of nasal infections and conjunctivitis may reduce the risk of having a blocked tear duct. Using protective eyewear may help prevent a blockage caused by injury.
The Association For Research in Vision and Ophthalmology (ARVO)