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Tear duct irrigation is a procedure used to clear blockages in the tear ducts, leading to improved tear drainage. This is particularly relevant in treating epiphora, which is characterized by excessive tearing. When the normal drainage pathways for tears are obstructed, fluid can accumulate, resulting in watery eyes. By irrigating the tear ducts, healthcare professionals can verify the patency of these pathways and often alleviate the symptoms associated with epiphora.

In contrast, the other conditions listed do not typically relate to problems with tear duct drainage. Conjunctivitis involves inflammation of the conjunctiva and does not require tear duct irrigation for treatment. Glaucoma is a serious eye condition characterized by increased intraocular pressure that requires specific medications or surgical interventions, rather than irrigation of tear ducts. Cataracts pertain to clouding of the lens and are not treated through drainage procedures but rather through surgical lens replacement. Thus, the most appropriate condition for tear duct irrigation is epiphora.