The nasolacrimal duct (sometimes called tear duct) carries tears from the lacrimal sac into the nasal cavity. Excess tears flow through nasolacrimal duct which opens in the nose. This is the reason the nose starts to run when a person is crying or has watery eyes from an allergy, and why one can sometimes taste eye drops
Obstruction of the nasolacrimal duct leads to the excess overflow of tears called epiphora.
In this condition an X-ray imaging using a dye that is injected through the small opening on the inner side of the lid margin (punctum) to diagnose the site and level of the obstruction, is needed to plan the surgery
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