Endoscopic dacryocystorhinostomy is a type of surgery sometimes used to treat blocked tear ducts in adults. It is rarely used in children. During this procedure, the surgeon inserts a thin fiber-optic light device through the tear duct opening (punctum) at the inner corner of the eyelid. This allows the surgeon to see where the tear duct is supposed to exit inside the nostril.
Next, the surgeon inserts an endoscope, a thin tube with a tiny camera on the end, into the nostril. An incision is made at the point where the fiber-optic light shines through the blocked tear duct. The incision opens a new passageway between the tear duct sac and the nasal cavity. The incision is done through the endoscope inside the nostril. There is no visible scarring after surgery.
Most of the focusing power in the eye occurs along the front surface, called the cornea, which is the clear "window" in the front of the eyeball. The next structure involved in focussing is the lens, which sits behind the cornea inside the eye. The ideal cornea has a round, symmetrically curved surface, like a basketball. Astigmatism is caused by an "out of round" cornea or a lens that is not symmetrical. As a result, people with significant astigmatism may have distorted or blurry vision.
This procedure may be done as an alternative to a standard dacryocystorhinostomy, which creates a new drainage canal and leaves a small scar.
Laser dacryocystorhinostomy uses an endoscope that also contains a laser, which is an intense, narrow beam of light that can cut through body tissues. The laser in the endoscope makes a hole in the nasal bone. This creates a connection between the tear duct sac and the nasal cavity.
Compared with similar types of surgery, laser dacryocystorhinostomy: