Epiphora & Lacrimal Obstruction

Overview

Epiphora is the clinical term for overflow tearing: a watery eye that spills onto the cheek instead of draining normally. The word names a symptom, not a disease, and working it up means asking which of three mechanisms is responsible. An anatomical block can sit anywhere along the drainage route, from congenital NLDO in an infant to an acquired duct stenosis in an adult. Punctal stenosis is the most common form of that acquired narrowing, usually driven by chronic blepharitis closing down the punctal opening itself, and it responds well to snip punctoplasty once a patent nasolacrimal duct on syringing rules out an obstruction further downstream. The drainage system can be anatomically open but mechanically failing to pump tears through it. Or tear production can simply outpace what a normal system is able to clear. All three present identically to the patient as a watery eye. That is exactly why the exam, not the history, does most of the diagnostic work.

Congenital Nasolacrimal Duct Obstruction

Congenital nasolacrimal duct obstruction (NLDO) is the most common cause of tearing and discharge in infants, typically presenting soon after birth as a persistently sticky, watery eye. The anatomical basis is a membranous obstruction at the valve of Hasner, the mucosal fold at the duct's termination in the inferior meatus. In many infants this membrane simply hasn't canalized (opened) by birth.

Most of these obstructions resolve on their own as the membrane finishes canalizing over the first year of life, so first-line management under age one is conservative: digital massage over the lacrimal sac (Crigler massage), performed by the caregiver, raises hydrostatic pressure within the sac and helps rupture the residual membrane. Probing and other invasive steps are reserved for obstructions that persist beyond conservative management. In this age group, surgery is a second-line step, not a first response.

When symptoms persist past the first birthday, probing becomes the next step, usually performed under general anesthesia. Success declines with age: reported rates run from the high 80s at 13 to 18 months down into the 50s by age 3 or 4. A failed probe is rarely repeated blind. Most surgeons move instead to silicone intubation, leaving a soft stent in place for several months to keep the duct open while it heals. Balloon catheter dacryoplasty is a comparable option but tends to be reserved for recurrent or more complex obstructions, since the disposable catheter adds real cost. Dacryocystorhinostomy is held back further still, for cases that fail these steps or involve bony obstruction, dacryocystitis, or a mucocele.

Functional Epiphora & Pump Failure

Not every epiphora patient has a blockage. When an adult presents with a watering eye but the nasolacrimal system proves fully patent on syringing (see below), the likely explanation is functional epiphora from lacrimal pump failure. The passage is open, but the orbicularis-driven pumping action that actively draws tears through the canaliculi and sac, covered in more detail on the lacrimal drainage anatomy page, is weak or absent. Causes include orbicularis weakness (as in facial nerve palsy), eyelid malposition that disrupts normal apposition of the puncta to the tear lake, or simple age-related lid laxity. The architecture is intact; nothing is effectively moving tears through it.

Recognizing functional epiphora changes the treatment target. There is no stricture to bypass surgically, so management focuses on restoring normal lid apposition and pump function, for example correcting an underlying ectropion, rather than performing a bypass procedure meant for true obstruction.

Reflex Tear Hypersecretion

The third mechanism is production outrunning drainage rather than drainage failing outright. Surface irritation, whether from a foreign body, dry eye, or corneal disease, triggers reflex hypersecretion through the trigeminal-to-facial-nerve reflex arc, and the resulting flood of tears can exceed even a fully functional drainage system's capacity. This is the mechanism behind the seemingly paradoxical complaint of "watery eyes" in a patient whose real problem is dry eye disease. Poor tear film quality irritates the surface, which reflexively triggers a wave of aqueous tears that the patient experiences as watering rather than dryness.

Interpreting the Syringing Test

Lacrimal syringing (irrigation) is the bedside test that localizes an obstruction when one is present. Saline is gently injected through a punctum, and where it goes, or comes back from, pinpoints the level of the block. If saline refluxes back out through the same punctum it was injected into, the obstruction lies within that specific canaliculus, proximal to the common canaliculus. If the system is fully patent, meaning saline passes into the nose or throat without reflux, yet the patient still reports epiphora, the diagnosis shifts to functional epiphora (pump failure) rather than true anatomical obstruction, as discussed above.

A related bedside sign is the regurgitation test: pressing directly on the lacrimal sac and observing mucus or pus reflux from the punctum. A positive result indicates nasolacrimal duct obstruction with retained material in the sac, and when purulent, points toward dacryocystitis.

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