Cat Blocked Tear Duct — Popular

Congenital NLDO is most frequently observed in brachycephalic breeds such as Persians, Himalayans, and Exotic Shorthairs. Due to their flattened facial conformation, the nasolacrimal duct may be compressed, narrowed, or fail to develop a patent distal opening (functional imperforate punctum). In some kittens, the puncta may be anatomically absent (atresia).

The gold standard diagnostic test. A drop of fluorescein dye is placed in the conjunctival sac. Under normal conditions, dye should appear at the ipsilateral nostril within 5–10 minutes. Failure to observe dye suggests complete obstruction. Delayed transit (>20 minutes) indicates partial obstruction. cat blocked tear duct

Using a lacrimal cannula (e.g., 24-26 gauge), sterile saline is gently flushed through the superior punctum. Patency is confirmed if fluid flows freely from the nostril. Resistance or reflux from the same punctum indicates obstruction. The gold standard diagnostic test

The feline nasolacrimal system begins at the superior and inferior puncta, small openings located on the upper and lower eyelids at the medial canthus (inner corner of the eye). These puncta lead into the canaliculi, which converge to form the lacrimal sac. From the lacrimal sac, the nasolacrimal duct descends through the bony lacrimal canal and empties into the nasal vestibule. Unlike in dogs, the feline duct typically has a narrower lumen and a more tortuous course, making it potentially more susceptible to complete obstruction. The distal opening (nasal punctum) is located approximately 2–5 mm inside the nostril on the floor of the nasal vestibule. Failure to observe dye suggests complete obstruction

Complete slit-lamp biomicroscopy should rule out corneal disease (ulcers, keratitis), uveitis, or glaucoma as causes of reflex tearing.