Manometric measurement of lacrimal sac pressure after endoscopic and external dacryocystorhinostomy.

Objective: To evaluate endoscopic and external dacryocystorhinostomy (DCR) using a quantitative, objective functional tool.

Material And Methods: This study comprised 58 cases divided into 4 groups: healthy controls; patients suffering from epiphora due to nasolacrimal duct (NLD) obstruction; patients who had undergone endoscopic DCR; and patients who had undergone external DCR. The lacrimal sac pressure was measured during blinking, forced blinking and the Valsalva maneuver using a polygraph.