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What Is Nasolacrimal Duct Obstruction (NLDO)?

Nasolacrimal duct obstruction is blockage of the tear drainage channel that runs from the inner corner of the eyelids into the nose. When this duct is partially or completely obstructed, tears cannot drain normally and instead overflow onto the cheek. Stagnant fluid in the lacrimal sac can also become infected, leading to redness, swelling, and discharge. NLDO can be congenital in infants or acquired in children and adults. The condition ranges from mild nuisance tearing to painful infection.

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What Is Nasolacrimal Duct Obstruction (NLDO)?

Nasolacrimal duct obstruction is blockage of the tear drainage channel that runs from the inner corner of the eyelids into the nose. When this duct is partially or completely obstructed, tears cannot drain normally and instead overflow onto the cheek. Stagnant fluid in the lacrimal sac can also become infected, leading to redness, swelling, and discharge. NLDO can be congenital in infants or acquired in children and adults. The condition ranges from mild nuisance tearing to painful infection.

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Causes in Infants and Adults

In infants, NLDO is most often due to failure of the distal valve of Hasner to open fully at birth. Many of these obstructions clear spontaneously in the first year of life. In adults, scarring within the duct from chronic inflammation, previous infection, trauma, or nasal surgery is common. Nasal or sinus disease, tumors along the drainage pathway, and systemic conditions such as sarcoidosis are less frequent causes. Some cases are idiopathic, with no clear precipitating factor.

Symptoms and Examination Findings

Typical symptoms include chronic tearing, mucus discharge, and recurrent crusting at the inner canthus. Pressure over the lacrimal sac can produce reflux of tears or pus through the puncta in infected cases. The surrounding skin can become irritated from constant wetness. On examination, the clinician inspects the lids, puncta, and sac area, looking for swelling, tenderness, or a bluish bulge in infants. Dye disappearance tests and irrigation help confirm impaired drainage.

Diagnosis and Tests

Diagnosis begins with history and clinical examination of the lacrimal outflow system. In the clinic, fluorescein dye is instilled into the conjunctival sac, and the rate of clearance is observed. Persistent dye and tear overflow suggest obstruction. Irrigation through the puncta can show whether fluid passes into the nose or refluxes, indicating the level of blockage. Imaging studies such as dacryocystography or CT scans are reserved for complex or atypical cases, especially when tumors or fractures are suspected.

Treatment and Prognosis

In infants, conservative management with lacrimal sac massage and observation is often successful, and probing under anesthesia is considered if obstruction persists beyond several months. Adults with symptomatic NLDO usually need dacryocystorhinostomy, a surgical procedure that creates a new drainage passage between the lacrimal sac and nasal cavity. Temporary stents or tubes are sometimes placed to keep the new channel open. Prognosis after appropriate surgery is generally excellent, with marked reduction in tearing and infection risk.

FAQs About Nasolacrimal Duct Obstruction

Is NLDO in babies dangerous?

Most congenital obstructions are benign and clear with time or simple procedures, but persistent infection, swelling, or fever needs prompt evaluation.

Can eye drops alone fix a blocked nasolacrimal duct?

Drops can treat surface irritation or mild infection, but structural obstruction usually requires massage, probing, or surgery.

Is dacryocystorhinostomy a major operation?

It is a delicate surgery but commonly performed, often on an outpatient basis, with a good success rate in experienced hands.

Can NLDO come back after surgery?

Re obstruction is uncommon but possible, particularly when scarring, ongoing inflammation, or inadequate nasal space is present.

References

NCBI Bookshelf (StatPearls). ?Nasolacrimal Duct Obstruction.? https://www.ncbi.nlm.nih.gov/books/NBK532873/

AAPOS. ?Nasolacrimal Duct Obstruction.? https://aapos.org/glossary/nasolacrimal-duct-obstruction

American Academy of Ophthalmology (AAO). ?Nasolacrimal Duct Obstruction in Children.? https://www.aao.org/education/disease-review/nasolacrimal-duct-obstruction-4

University of Iowa (EyeRounds). ?Congenital Nasolacrimal Duct Obstruction.? https://eyerounds.org/cases/296-congenital-nasolacrimal-duct-obstruction.htm

NCBI Bookshelf (StatPearls). ?Dacryostenosis.? https://www.ncbi.nlm.nih.gov/books/NBK563132/