Definition External Dacryocystorhinostomy (DCR) is the surgery to connect the mucosal surface of lacrimal sac to the nasal mucosa by removing the intervening bone. It creates a permanent anastomosis between the lacrimal sac and medial meatus of nose. Prerequisite Common canaliculi must be patent Indications of External Dacryocystorhinostomy Nasolacrimal duct…