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Dacryoendoscopic images of membranous CNLDO patients during operation. a. The normal lacrimal canaliculus. b. The surrounding area of the common canalicula. The valve of Rosenmüller was visible. c. The obstruction point- the distal end of the NLD. d. An irregular scar between the lacrimal sac and the lacrimal canaliculus. e. The false passage near the common canaliculus. f. Inflammation and secretions inside the lacrimal duct
