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Lacrimal canaliculi are narrow channels in the eyelids that carry tears from the puncta to the lacrimal sac. Most people have upper and lower canaliculi that join into a common segment before the sac. Blinking creates a gentle pump that moves fluid along the ducts. Efficient drainage keeps the ocular surface fresh and clear.
read more about lacrimal canaliculi ...They start at small openings called puncta near the inner lid margins. The channels run medially and typically merge before entering the sac. From there, tears flow through the nasolacrimal duct into the nose. This route links surface lubrication with nasal drainage.
The lacrimal canaliculi consist of superior and inferior segments that collect tears from the puncta. Each canaliculus measures about 10 millimeters long and contains a vertical and horizontal portion. They often join to form a common canaliculus before entering the lacrimal sac. The lining is stratified squamous epithelium supported by elastic connective tissue.
The lacrimal canaliculi transport tears from the eye's surface to the tear sac. This drainage helps clear away debris and maintain a healthy tear balance for smooth, comfortable 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 inspect puncta, probe the ducts, and may irrigate to confirm patency. Dyes can trace flow from the surface to the nose. Imaging assists when trauma or scarring complicates the path. Assessment guides simple care or reconstruction plans.
Regular lid hygiene helps keep puncta clear of debris. Managing lid margin inflammation preserves smooth flow. Protective eyewear limits drying wind that can thicken secretions. Gentle routines maintain efficient drainage.
Balanced drainage prevents pooling that could blur vision or irritate the surface. Proper outflow keeps the tear film renewed and optically smooth. Coordinated pumping during blinks sweeps away contaminants. The ducts help sustain comfortable, stable vision all day.
Is one canaliculus enough? Either duct can compensate partly if the other narrows.
Do plugs block canaliculi? Punctal plugs sit at the opening to slow drainage.
Are canaliculi and canaliculus the same? Canaliculus is singular; canaliculi is plural.
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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 and prevention. Cleveland Clinic. https://my.clevelandclinic.org/health/diseases/14793-blocked-tear-duct