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What Is a Lacrimal Duct Reflux Test?

A lacrimal duct reflux test is a simple office test that looks for signs of a tear drainage blockage. During the test, a clinician gently flushes fluid into the tear drainage opening (punctum) and watches what happens. If fluid or mucus flows back out instead of moving through, that is called reflux. Reflux can suggest narrowing or blockage somewhere along the drainage pathway. The test is often used along with other exams to explain constant watery eyes.

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What Is a Lacrimal Duct Reflux Test?

A lacrimal duct reflux test is a simple office test that looks for signs of a tear drainage blockage. During the test, a clinician gently flushes fluid into the tear drainage opening (punctum) and watches what happens. If fluid or mucus flows back out instead of moving through, that is called reflux. Reflux can suggest narrowing or blockage somewhere along the drainage pathway. The test is often used along with other exams to explain constant watery eyes.

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Why Is This Test Done?

Doctors use it when someone has ongoing tearing, discharge, or repeated infections near the tear sac. It can help tell whether tears are not draining well or whether irritation is causing extra tearing. The test can also guide the next step, such as imaging, medication, or a referral to a tear duct specialist. Results are interpreted together with your symptoms and eyelid exam.

How the Test Is Performed

The clinician numbs the eye area with drops, then places a small instrument at the punctum. A small amount of sterile fluid is slowly flushed into the drainage system. You may feel pressure, and some people notice a salty taste if the fluid reaches the nose or throat. The clinician notes whether the fluid passes through easily or refluxes back out.

What Does Reflux Mean?

Reflux can mean there is a partial or complete blockage downstream, so fluid cannot move forward normally. Sometimes reflux also happens if the opening is positioned poorly due to eyelid laxity. The side, amount, and thickness of reflux can give clues about where the issue might be. Your doctor may recommend additional tests to confirm the exact location of the blockage.

What Happens After the Test?

Next steps depend on the cause and severity. Mild cases may improve with treating eyelid inflammation, infections, or dry eye that triggers reflex tearing. If there is a confirmed blockage, treatment may include probing, stenting, or surgery to create a new drainage pathway. Your doctor will explain options based on your exam findings.

FAQs on Lacrimal Duct Reflux Test

Does the reflux test hurt?

It is usually uncomfortable rather than painful, especially because numbing drops are used. You may feel pressure during the flush. Any irritation typically fades quickly.

What does it mean if I taste saline in my throat?

A salty taste can mean the fluid traveled through the tear drainage system into the nose and throat. That often suggests the pathway is open. Your clinician will still interpret it with the full exam.

What treatments help if there is a blockage?

Treatment can range from managing infection or inflammation to procedures that open the drainage path. Some people need a small stent, and others may need surgery if the blockage is more complete. Your eye doctor will match treatment to the cause and location.

How is this different from a dye test?

A dye test tracks how tears drain naturally over time after a colored drop is placed in the eye. Reflux testing uses gentle flushing to see if fluid can pass through the system. Doctors may use both to get a clearer picture.

References

Blocked Tear Duct (Nasolacrimal Duct Obstruction). Cleveland Clinic. https://my.clevelandclinic.org/health/diseases/17260-blocked-tear-duct-nasolacrimal-duct-obstruction. Updated January 19, 2024.

Blocked Tear Duct Symptoms. American Academy of Ophthalmology. https://www.aao.org/eye-health/diseases/blocked-tear-duct-symptoms. October 14, 2015.

Epiphora. National Institutes of Health (NHI). https://www.ncbi.nlm.nih.gov/books/NBK557449/. Updated August 7, 2023.

Nasolacrimal Duct Obstruction. National Institutes of Health (NHI). https://www.ncbi.nlm.nih.gov/books/NBK532873/. Updated August 8, 2023.

How Tears Work. National Eye Institute. https://www.nei.nih.gov/learn-about-eye-health/healthy-vision/how-eyes-work/how-tears-work. Updated August 6, 2025.