FIELD: ophthalmology.
SUBSTANCE: used for the diagnosis of dacryostenosis. A computed tomography scan with contrast of the lacrimal ducts is performed. Determine the length (l) and volume (V) of the contrasted part from the level of the apex of the lacrimal sac to the level of the mouth of the nasolacrimal passage, the average cut area of the contrasted part of the lacrimal passages according to the Formula 
radius of the contrasted part of the lacrimal passages (R) according to the Formula 
, hydrodynamic relation according to the formula 
. If the hydrodynamic ratio is more than 1 mm3, dacryostenosis is diagnosed.
EFFECT: objective data for diagnosing dacryostenosis by determining the hydrodynamic ratio.
1 cl, 1 ex
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