References
Tear Duct. American Academy of Ophthalmology. https://www.aao.org/eye-health/anatomy/tear-duct. Date Accessed February 4, 2026.
Lacrimal Apparatus. Cleveland Clinic. https://my.clevelandclinic.org/health/body/24415-lacrimal-apparatus. Date Accessed February 4, 2026.
Blocked Tear Duct (Nasolacrimal Duct Obstruction). Cleveland Clinic. https://my.clevelandclinic.org/health/diseases/17260-blocked-tear-duct-nasolacrimal-duct-obstruction. Date Accessed February 4, 2026.
Tearing. MSD Manual Professional Edition. https://www.msdmanuals.com/professional/eye-disorders/symptoms-of-ophthalmic-disorders/tearing. Date Accessed February 4, 2026.
Blocked Tear Duct - Symptoms & Causes. Mayo Clinic. https://www.mayoclinic.org/diseases-conditions/blocked-tear-duct/symptoms-causes/syc-20351369. Date Accessed February 4, 2026.