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.
Feline nasolacrimal duct obstruction is a manageable yet often chronic condition that requires a systematic diagnostic approach. The fluorescein dye transit test and ductal flushing remain essential diagnostic and therapeutic tools. Clinicians should differentiate congenital (breed-associated) from acquired (inflammatory, neoplastic, traumatic) causes to guide prognosis and treatment. While medical management suffices for mild cases, surgical bypass is available for severe, refractory obstructions. Further research into the role of viral rhinitis in chronic feline NLDO would improve long-term management strategies. cat blocked tear duct
[Generated for educational purposes] Publication Date: [Current Date] The feline nasolacrimal system begins at the superior
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. Unlike in dogs, the feline duct typically has
Feline Nasolacrimal Duct Obstruction: Etiology, Clinical Presentation, Diagnosis, and Management