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 Background & Objectives: Considering the high prevalance of congenital obstruction of nasolacrimal ducts in infants and the importance of timely intervention and due to the lack of previous similar researches in Ardebil province, and regarding the discrepancies in the reports about the degree of successful accomplishment of the first probing, the researchers set out to design and perform the present research among the patients referring to ophthalmology ward.

  Methods: This descriptive and cross-sectional study was conducted on 84 children suffering from congenital nasolacrimal duct obstruction who had undergone pobing surgery in Alavi hospitaly between 2000 and 2002.

  Results: 70 eyes of 50 patients were examined. 27 (54%) were male and 23 (46%) were female. 20 of them (40%) had bilateral involvement and 30 (60%) had unilateral one. Involvement of right eye (60%) was more than left eye (40%) and was expected in first child (56%) more than subsequent offsprings. Clinical manifestation was epiphora in 44%, prulent discharge in 12% and epiphora with prulent discharge in 44%. 90% of the subjects were operated for the first time while 10% had had 2-3 operations before complete recovery was observed in 48% of the patients 46% of them had relative improvement and no recovery was witnessed in 6% of them.

 Conclusion: This study showed that the male infants were affected more than females, and the rate of involvement in right eye as well as in first children was relarively high. Also the rate of recovery among unilateral groups and infants under 1 year of age was considerably high, so it is recommended that the patients of this age group undertake a therapy with topical antibiotic and lacrimal sac massage and because of the low success of the surgery above 2 years of age, probing is recommended from 6 month to 18 months of age if medical treatment was unsuccessful.

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Background & Objective: one of the most common causes of Epiphora or lacrimation or recurrent infection is Dacryocystitis. The Dacryocystorhinostomy operation, which involves fistulization of the lacrimal sac into the nasal cavity may alleviate the symptoms. Since the routine usage of silicon tube in DCR operation for reducing the replapse has been a controversial issue, This study was done to investigate the rate of success of DCR operation
with silicone tube.
Methods: This study was a cross-sectional descriptive study in which all of the patients (189) who had history of DCR at Sina and Alavi hospitals were asked to continue the treatment after the operation through contact or follow up from home. So the results of their records were analyzed statistically.
Results: 102 out of 189 patients had history of operation who had referred for follow up, in terms of most prevalent symptoms, epiphora and purulent discharge was the highest 55.6% and the second one was epiphora alone 29.1%. The operation prevalence was more in women 74.1%. than in men 25.9% and unilateral involvement 97.3% was more than bilateral one. The highest age prevalence in DCR operation was 30-60 years. The surgery was successful in 82.3%. It was a little more successful in men (85.7%) than in women and the mean age of patients with successful DCR surgery was more than that of patients with unsuccessful DCR surgery.
Conclusion: The results showed that the rate of recovery in unilateral involvement is more than that of bilateral involvement. Also, success after the operation in patients whose primary complain was only purulent discharge was significantly more than those whose primary complain was epiphora and purulent discharge, It also seems that routine application of silicon tuby in DCR surgery has no effect in the increase of recovery and decrease of disease
recurrency which of course more prospective studies are required to prove this.