In extensive obstruction of both lacrimal canals the present most frequently used method is conjunctivocystorhinostomy using Jones’ drainage cannula. In this type of bypass operation the palpebral aperture is connected with the nasal cavity by a hollow drainage cannula through which the tears flow from thre palpebral aperture. The effectivity of the procedure is 85 - 90%. The drainage cannulae can be straight or bent and are as a rule made from pyrex glass or silicone. Patients should be highly motivated and must be made familiar with possible complications - most frequently slipping of the cannula. With regard to the necessary postoperative cooperation, the operation is not recommended for young children. The authors implemented in 1996 - 1998 a total of 14 conjunctivocystorhinostomies and used a combined approach: the lacrimal sac is opened into the nose by the endonasal route under general anaesthesia, the cannula is inserted from an external approach. In one instance a straight silicone cannula was used, in the remaining patients a bent silicone cannula. In two instances loss of the cannula occurred. In 10 instances after surgery objective and subjective improvement was recorded and mitigation or regression of complaints. The authors evaluate the initial experience with this type of operation as satisfactory and encouraging.

        Key words: canalicular obstruction, conjuncticocystorhinostomy, bypass, Jones’ cannula.