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Blocked Tear Duct

 

What is a blocked tear duct?

A blocked tear duct is a condition in which the drainage system that carries tears away from the eye becomes partially or fully obstructed. Under normal circumstances, tears produced by the lacrimal gland flow across the surface of the eye and drain through small openings at the inner corner of the eyelids into a series of channels that lead to the nose. When any part of this system becomes blocked, tears have nowhere to go and overflow onto the face.

A blocked tear duct is one of the most common causes of a watery eyes condition and chronic eye irritation. Beyond the inconvenience of constant tearing, a blocked tear duct can lead to recurrent eye infections and inflammation if bacteria accumulate in the obstructed drainage system.

Blocked tear ducts can affect people of all ages, from newborns to older adults, and range in severity from a partial narrowing that causes intermittent tearing to a complete obstruction that results in persistent overflow and infection. Blocked tear duct treatment depends on the underlying cause and the degree of obstruction, and ranges from simple observation in infants to surgical correction in adults.

Types of blocked tear ducts

Blocked tear ducts are classified by the location of the obstruction within the tear drainage system and the age at which they occur:

  • Congenital blocked tear duct is the most common type in infants and young children. It occurs when the thin tissue membrane at the lower end of the tear drainage system fails to open fully at or shortly after birth. Most cases resolve on their own within the first year of life.
  • Acquired blocked tear duct develops over time in older children and adults due to narrowing or obstruction of the drainage channels from age-related changes, chronic inflammation, infection, injury, or other causes.
  • Punctal stenosis includes the narrowing of the small drainage openings at the inner corner of the eyelids. This can occur on its own or alongside obstruction deeper in the drainage system.
  • Canalicular obstruction is a blockage within the small channels that connect the drainage openings to the main tear sac. This type can be particularly challenging to treat depending on the extent of the obstruction.
  • Nasolacrimal duct obstruction is the most common location of blockage in adults. The nasolacrimal duct is the final channel that carries tears from the tear sac into the nasal cavity.

What are the symptoms of a blocked tear duct?

The most common and noticeable symptom of a blocked tear duct is persistent tearing or watery eyes that occurs regardless of emotional state or environmental triggers. Additional symptoms include:

  • Tears spilling onto the cheeks during normal daily activity
  • Redness and irritation at the inner corner of the eye
  • Crusting or discharge along the eyelid or at the inner corner of the eye, particularly in the morning
  • Blurred vision caused by excess tears on the surface of the eye
  • Swelling or tenderness near the inner corner of the eye
  • Recurrent eye infections or conjunctivitis
  • A visible lump or swelling at the inner corner of the eye, which may indicate a tear sac infection known as dacryocystitis
  • Mucous or pus-like discharge when pressure is applied to the inner corner of the eye
  • In infants, a blocked tear duct typically presents as persistent watering and crusting of one or both eyes from the first weeks of life.

What causes a blocked tear duct?

A blocked tear duct develops when something narrows or obstructs one or more parts of the tear drainage pathway. Common causes include:

  • Age-related changes
  • Chronic inflammation or infection
  • Nasal or sinus conditions
  • Facial trauma or injury that can damage the system
  • Previous surgery or medical treatment that may narrow or block the tear drainage pathway
  • Tumors or growths that can compress or obstruct the system
  • Congenital factors

How is a blocked tear duct diagnosed?

Diagnosis begins with a clinical examination of the eyelids, drainage openings, and surrounding structures. An oculofacial plastic surgeon will assess the tear drainage openings at the inner corner of the eyelids, evaluate the degree of tearing, and gently probe or irrigate the drainage system to determine the location and degree of the obstruction.

Additional diagnostic steps may include:

Dye disappearance test - a drop of fluorescent dye is placed in the eye and the rate at which it clears from the surface is observed. Slow clearance suggests a drainage problem.

Nasolacrimal irrigation - a small amount of saline is flushed through the drainage system to assess patency and identify the location of the blockage.

Dacryocystography or dacryoscintigraphy - imaging studies that visualize the tear drainage pathway to identify the precise location and extent of the obstruction.

Nasal endoscopy - examination of the nasal cavity to assess the nasal end of the drainage system and identify any contributing nasal or sinus pathology.

How is a blocked tear duct treated?

Treatment depends on the age of the patient, the underlying cause, and the location and severity of the obstruction.

In infants, most congenital blocked tear ducts resolve on their own within the first 12 months of life as the drainage system matures. During this period, nasolacrimal massage, a gentle technique in which pressure is applied to the tear sac area to encourage the membrane to open, is often recommended alongside antibiotic drops when infection is present.

When a congenital blocked tear duct does not resolve with conservative management by 12 months of age, a simple in-office or outpatient procedure can be performed to open the obstructed membrane. A fine probe is passed through the drainage opening and gently advanced through the system to break through the obstruction. This procedure has a high success rate in young children and is typically performed under brief general anesthesia.

In adults, probing and irrigation may be used to assess and temporarily open a narrowed drainage system, though it is less likely to produce a lasting result for complete obstructions.

A balloon dacryoplasty is a procedure in which a small balloon catheter is passed through the tear drainage system and inflated at the site of obstruction to widen the narrowed channel. This technique may be appropriate for partial obstructions or stenosis within the drainage channels.

The most effective and definitive blocked tear duct treatment for adults with nasolacrimal duct obstruction is a procedure called dacryocystorhinostomy (DCR). DCR creates a new drainage pathway directly between the tear sac and the nasal cavity, bypassing the obstructed segment entirely.

DCR can be performed using one of two approaches:

External DCR involves a small incision on the side of the nose to access the tear sac and create the new drainage opening

Endoscopic DCR is performed entirely through the nasal cavity using a small camera and instruments, with no external incision required

Recovery following DCR surgery is generally well tolerated. Mild swelling, bruising, and nasal congestion are expected in the first one to two weeks. Most patients experience a significant and lasting reduction in tearing once the new drainage pathway has fully healed.

Persistent watery eyes are often a sign that the tear drainage system needs attention. Whether the cause is a simple narrowing or a complete obstruction, the oculofacial plastic surgeons at The Iowa Clinic can evaluate your tear drainage system and recommend the most appropriate course of treatment. Call 515.875.9480 to schedule an appointment.