[Value of dacryography in the exploration of injuries to the lacrimal ducts (author's transl)].

Dacryography is the only objective non-clinical method for studying the permeability of the lacrimal excretory ducts. Pre-operatively, it is an essential element for the choice of surgical intervention; post-operatively, it is always indicated if weeping persists. New surgical techniques such as arterial grafting have stimulated renewed interest in this method.