Nasolacrimal duct endoscopy
Nasolacrimal duct endoscopy is an instrument that detects whether the nasolacrimal duct is blocked. Nasolacrimal duct is a membrane duct. The upper part is embedded in the bony nasolacrimal duct, which is closely combined with the periosteum; the lower part is on the deep side of the mucosa on the outer side of the nasal cavity. The lower part opens at the front of the outer wall of the lower nasal passage.
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