Tear ducts, also known as lacrimal ducts, are small tubes that carry tears from the eyes to the nose. They are responsible for draining the tears that are produced by the lacrimal glands, located above the outer corner of each eye. The tears are responsible for keeping the surface of the eyes lubricated and clean, and also help to protect the eyes from infection.The tear ducts begin at the lacrimal puncta, which are small openings located at the inner corner of the upper and lower eyelids. The ducts then travel through the lacrimal canaliculi, which are small channels located within the upper and lower eyelids. The ducts then enter the lacrimal sac, which is a small pouch located at the inner corner of the eye.From the lacrimal sac, the ducts enter the nasolacrimal duct, which is a longer tube that runs down the side of the nose. The nasolacrimal duct opens into the nasal cavity, which is located inside the nose. The tears then drain into the nasal cavity and are eventually swallowed.In some cases, the tear ducts can become blocked, which can lead to a buildup of tears in the eyes. This condition is known as a blocked tear duct and can cause symptoms such as watery eyes, redness, and crusting around the eyes. Blocked tear ducts can occur as a result of infection, injury, or a congenital condition.Treatment for blocked tear ducts typically involves a procedure known as dacryocystorhinostomy (DCR) which is a surgery to create a new opening in the lacrimal sac to the nose to allow the tears to drain properly.In summary, tear ducts, also known as lacrimal ducts, are small tubes that carry tears from the eyes to the nose. They begin at the lacrimal puncta, located at the inner corner of the upper and lower eyelids, and travel through the lacrimal canaliculi, lacrimal sac and the nasolacrimal duct, which opens into the nasal cavity. Tear ducts can become blocked, this condition is known as a blocked tear duct and can cause symptoms such as watery eyes, redness, and crusting around the eyes. Treatment typically involves a procedure known as dacryocystorhinostomy (DCR) surgery.