External DCR is still the most popular choice for NLDO and dacryocystitis and has a success rate of 80-95%. If there is canalicular damage or a narrow upper nasal cavity it may be necessary to insert a silicone tube. Day-case external DCR under local anaesthesia is gaining popularity.
Endonasal DCR is acknowledged to have a lower success rate. Power tool and laser assisted DCR's can be performed as day case procedures and can be less time consuming.
Balloon dilatation dacryoplasty has also been shown to be effective in partial nasolacrimal duct obstruction with a claimed success rate of 60%.
