title: An aid to successful probing of the nasolacrimal duct.
abstract: An electrical method is described for confirming the entry into the nose of a nasolacrimal probe.
mesh_terms: D006801:Humans; D007765:Lacrimal Apparatus / Q000601:surgery*; D009301:Nasolacrimal Duct / Q000601:surgery*; D013525:Surgical Instruments