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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. Alternative Names Dacryostenosis; Blocked nasolacrimal duct; Nasolacrimal duct obstruction (NLDO)
Clinical research has shown that nasolacrimal duct obstruction occurs in 2 to 4 out of 100 newborn babies. However, this number dramatically increases in children who have Down syndrome with statistics suggesting about 22% to 36% developing this condition.
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)