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Katherine M. Mastrota, OD, FAAO, advises on how to diagnosis this condition and not fall prey to a “knee-jerk” dry eye diagnosis.
“My eyes are teary.” How many times in your clinical session do you hear this complaint from a patient?
As clinicians, we are well schooled in connecting this common complaint to ocular surface/dysfunctional tear/dry eye disease. It is important to consider, however, that numerous causes of patient ocular anatomical compromise can precipitate complaints of a “teary eye.”
Dacryostenosis is an acquired or congenital condition that can cause epiphora and progress to dacryocystitis in children and adults. Dacryostenosis generally refers to an obstruction that can affect any part of the tear excretory system.1
The etiology of acquired dacryostenosis is multifactorial and not fully understood. Most commonly, it occurs from age-related stenosis of the nasolacrimal duct. Some cases are related to trauma, neoplasm, systemic disease, radiotherapy, or chemotherapy.1,2
Other causes include past nasal or facial bone fractures/sinus surgery that disrupt the nasolacrimal duct; inflammatory diseases (such as sarcoidosis, granulomatosis with polyangiitis [formerly Wegener granulomatosis]); tumors (maxillary and ethmoid sinus tumors); and dacryoliths (concretions found in the lacrimal apparatus, puncta, or canaliculi, and composed of epithelial cells, lipids, nonspecific debris, as well as calcium).2
Chronic inflammation may also cause fibrosis of the connective tissue fibers in the area of the lacrimal sac and nasolacrimal duct and loss of the blood vessels of the vascular plexus that surrounds the lacrimal sac and nasolacrimal duct contributing to malfunctioning of the tear outflow mechanism.1
Descending inflammation from the eye, or ascending inflammation from the nose, initiates swelling of the mucous membrane, remodeling of the helical arrangement of connective tissue fibers, malfunctions in the subepithelial cavernous body (vascular plexus) with reactive hyperemia, and temporary occlusion of the lacrimal passage.
As an example, repeated isolated occurrence of dacryocystitis leads to structural epithelial and subepithelial changes, which may result in either a total fibrous closure of the lumen of the efferent tear duct or to a nonfunctional segment in the lacrimal passage.3 However, in most cases of dacryostenosis, the cause is “involutional” and classified as “idiopathic.”
In addition, punctal stenosis can result in epiphora. The normal punctum is chronically exposed to irritant substances in the tear film. In most patients with punctal stenosis, there is inflammation caused by blepharitis, chronic exposure (ectropion), or an external irritant (including antihypertensive medications).
Punctal stenosis occurs in patients treated with chemotherapy agents for cancer.4 Interestingly, punctal stenosis has been reported as side effect of dupilumab 9and topical netarsudil used in glaucoma therapy.10
Infections involving the eyelid, such as those caused by typical HSV1, may also result in stenosis.5
Chronic blepharitis is a risk factor for punctal stenosis, as associated chronic inflammation would result in inflammatory membrane formation, conjunctival epithelial overgrowth, and keratinization around the walls of the punctum.
The pathogenesis suggested is chronic inflammation of the external punctum, leading to gradual fibrotic changes in the ostium and followed by progressive occlusion of the duct.6 Dry eye syndrome, which may be secondary to chronic blepharitis, has been suggested as an etiological factor for punctal stenosis.7
Diagnosis of dacryostenosis is typically made through history and physical examination. The examination begins with an inspection of the eyelids, the lacrimal puncta, and the conjunctiva to rule out gross abnormalities.
The lower eyelid may present with mild redness and an increase in tear meniscus. Massage of the lacrimal sac may provoke reflux of tears and/or mucus onto the eye through the puncta.Other tests to consider include the following:
Remember to observe the puncta and tear flow in your patients who report epiphora and not fall prey to the “knee-jerk” dry eye diagnosis.