The term functional nasolacrimal duct obstruction (FNLDO; watering with patent drainage) is misleading as it implies occluded drainage and solely nasolacrimal duct pathology. 'Normal' tear ...

However, with chronic nasolacrimal duct infections, scarring of the duct lining may cause irreversible blockage. If the duct is blocked, the tissue is likely to be irritated and fragile.

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