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When a tear duct is blocked it cannot drain normally, causing a watery, irritated or chronically infected eye. A instrument is used to enlarge (dilate) the punctal openings and a narrow probe is guided through the puncta, into the tear drainage system, then through the nasal opening and removed. The tear drainage system is flushed with a saline solution to clear out any residual blockage. The stent (implant made of synthetic material) is inserted into the nasolacrimal duct to maintain the opening created by the probing.