The nasolacrimal ducts are part of the body's system for draining tears from the eyes. Whe
n the tear ducts are blocked, it causes an accumulation of fluid in the tear sac that can cause infection. Tears are usually discharged through small tubes called the tear ducts, which are drawn from the eye to the nose. If the tear duct is blocked or unable to open, tears cannot be properly removed. The conduit may be filled with fluid and swollen, inflamed and sometimes infected.
Tear obstruction often occurs in infants, although it may occur at any age.
Dacryocystorhinostomy (DCR) is a procedure performed to treat nasolacrimal duct obstruction.

Symptoms of nasolacrimal duct obstruction
Symptoms often affect only one eye. These symptoms may include:

• Excessive tearing: This may be seen as wet eyes or tears on the cheeks
• Create yellow or white tan in the corner of the eye: Eyelids may stick together
• Crusting of the eyelids
• Blurred vision
• Redness and swelling around the eyes or nose: This can be due to an infection in the drainage system. In cases with severe infection, the infection will spread to the eyelids. Severe infection can cause fever, pain, redness, and swelling, and may cause mucus or pus in the eye.

Babies with tear obstruction usually have symptoms within days to the first few weeks after birth.

Treatment
Tear duct obstruction can only be treated with tear duct cannulation under the age of two to three years; Therefore, in adults, a procedure called a dacryocystorhinostomy (DCR) is performed where the tear duct opens into the nose. If the beginning of the conduit is closed, you have to insert a silicone tube in addition to the DCR for a few months, but if the end of the duct is closed only DCR is enough.