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Lacrimal canaliculi are slim channels in the eyelids that carry tears from the puncta to the lacrimal sac. Most people have an upper and a lower canaliculus that merge into a common canaliculus before entering the sac. Blinking generates a gentle pumping action that moves fluid along this route. Efficient flow prevents overflow onto the cheek and supports clear vision.
read more about canaliculus ...They begin at tiny openings called puncta on the lid margins near the inner corner. The channels travel medially and typically join into a common segment before the lacrimal sac. From there, tears pass through the nasolacrimal duct into the nose. This pathway connects surface lubrication to nasal drainage.
The lacrimal canaliculi are lined by stratified squamous epithelium supported by elastic connective tissue. Each canaliculus measures a few millimeters before merging into the lacrimal sac. Valves within the ducts prevent reflux during blinking. Their orientation ensures smooth tear flow from ocular surface to nasal cavity.
The canaliculi are tiny channels that drain tears from the eye's surface into the nasal cavity. By keeping tears flowing properly, they prevent excessive tearing or dryness that could blur or irritate vision.
Understanding the anatomy of the eye helps explain how vision works and why each part is important for healthy sight. From the cornea that focuses light to the retina that captures images, every structure plays a precise role. Learning about these components encourages better eye care and awareness of changes that could signal a problem.
Clinicians examine puncta, probe the channels, and may irrigate to confirm patency. Dyes can trace flow through the system during office testing. Imaging helps in complex cases involving trauma or scarring. Findings guide decisions from simple care to reconstruction.
Lid hygiene reduces debris near puncta and keeps openings clear. Managing eyelid margin inflammation supports smooth flow. Protective eyewear limits drying wind exposure outdoors. These habits preserve the efficiency of tear drainage.
Drainage that matches secretion prevents stagnant pooling on the surface. Balanced removal keeps the tear layer fresh and optically smooth. When flow is coordinated, blinks clear contaminants and spread a clean film. This harmony promotes comfortable, stable vision throughout the day.
Are both upper and lower ducts necessary? Most people have both, and either can compensate somewhat.
Do plugs block canaliculi? Punctal plugs sit at the opening to reduce drainage without entering far.
Canaliculus or canaliculi? Canaliculus is singular; canaliculi is plural.
National Library of Medicine. (2023). Anatomy, head and neck: Eye lacrimal duct. StatPearls. https://www.ncbi.nlm.nih.gov/books/NBK531487/
National Library of Medicine. (2023). Anatomy, head and neck: Eye nasolacrimal. StatPearls. https://www.ncbi.nlm.nih.gov/books/NBK482213/
MSD Manual Professional Edition. (2025). Tearing. MSD Manual Professional Edition. https://www.msdmanuals.com/professional/eye-disorders/symptoms-of-ophthalmic-disorders/tearing
American Academy of Ophthalmology. (2025). Canalicular obstruction. EyeWiki. https://eyewiki.org/Canalicular_Obstruction
Cleveland Clinic. (2024). Blocked tear duct: Causes, symptoms, treatment & prevention. Cleveland Clinic. https://my.clevelandclinic.org/health/diseases/14793-blocked-tear-duct