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To evaluate the effect of monocanalicular silicone tube intubation outcomes as an initial surgical treatment in children older than 1 year old with primary nasolacrimal obstruction. Probing or monocanalicular silicone tube intubation was performed as primary surgical treatment on 12-48 months old children with primary nasolacrimal obstruction. Probing was performed on 53 eyes of 43 patients and silicone tube intubation on 45 eyes of 39 patients. Treatment was considered successful after improvement in patient complaints, the presence of