A dacryocystorhinostomy (DCR) is a type of surgery done to create a new tear drain between your eyes and nose. You may need this surgery if your own tear duct has become blocked.
Your eyelids have two small openings that drain some of the tears covering your eye. Blinking pushes tears into these openings. From there, the old tears empty into a small tube and then into a larger area, called the lacrimal sac. This sac leads to the tear duct. This duct passes around some bony structures surrounding your nose and drains into your nasal cavity.
Sometimes, this drainage system gets blocked. This can cause a lot of tearing or discharge from the eye. The blocked duct often becomes infected as well.
In most cases, the cause of a blocked tear duct is not known. Other times, the blocked tear duct can be caused by health problems such as: