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 ...

Crusty eyes may be caused by sleep, allergic conjunctivitis, blocked tear ducts, and blepharitis. You can treat and prevent crusty eyes at home by cleansing eyelids daily and applying warm compresses.