A method of determining the patency of the nasolacrimal apparatus.
D002648:Child; D003231:Conjunctivitis / Q000175:diagnosis; D005260:Female; D006801:Humans; D007765:Lacrimal Apparatus / Q000502:physiology*; D007767:Lacrimal Duct Obstruction / Q000175:diagnosis*; D008297:Male; D008875:Middle Aged; D008962:Models, Theoretical; D009885:Ophthalmology / Q000295:instrumentation; D012852:Sinusitis / Q000175:diagnosis