The aim of this study is to compare results of endoscopy assisted nasolacrimal probing with the standard simple probing in cases with congenital nasolacrimal duct obstruction . Furthermore, investigators will identify associated anatomical anomalies. Investigators believe results of this study can be valuable in better understanding of this disease and provide a high evidence level necessary to propose a classification and management algorithm. Children with symptoms of unilateral or bilateral congenital nasolacrimal duct obstruction, no past surgical management, with one or more of the below criteria will be included: 1. Non-resolving symptoms of epiphora and/or discharge. 2. Congenital dacryocele not resolved after 1 week of lacrimal sac massage, and topical antibiotics. 3. As soon as subsidence of acute dacryocystitis. Parents will be asked about symptoms and patients will undergo lacrimal tests before and after operation in one week, one month and 3months based on a special record form. Patients will be randomly assigned to "simple probing" group or "endoscopy assisted probing" group. All operations will be performed in operative theater and under general anesthesia. Pre- and post-operative examinations will be performed in plastic clinic in Farabi hospital.
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Timeframe: 6 months