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It is objective, economical, non-invasive, comfortable and easy to spread.ObjectiveTo investigate the influence of conventional STI and endoscopic STI on clinical effects and safety of patients with chronic dacryocystitis. MethodOne hundred and ten patients with chronic dacryocystitis were chosen in the period in our hospital and randomly divided into two groups including conventional group(55 patients) with conventional STI and endoscopy group(55 patients) with endoscopic STI. The improvement rate of epiphora symptoms, ocular surface symptoms score