Syringing has limited reliability in differentiating nasolacrimal duct stenosis from functional delay.
Yinon ShapiraValerie JuniatCarmelo MacriDinesh SelvaPublished in: Graefe's archive for clinical and experimental ophthalmology = Albrecht von Graefes Archiv fur klinische und experimentelle Ophthalmologie (2022)
Full patency on syringing was unreliable for ruling out NLD stenosis and functional delay. Furthermore, a positive syringing may be associated with functional NLD delay and cannot reliably differentiate it from stenosis.