Repeat probing for treatment of persistent nasolacrimal duct obstruction.

Repeat probing of the nasolacrimal duct is one treatment option for children with persistent symptoms of nasolacrimal duct obstruction (NLDO) following an initial probing. The authors conducted a prospective, multicenter study in which 20 subjects age 6 to <48 months underwent a repeat probing for symptomatic NLDO and had follow-up visits 1 month and 6 months after surgery. Treatment success was defined as the absence of all three clinical signs of nasolacrimal duct obstruction-epiphora, increased tear lake, and mucous discharge. Repeat probing was successful in 56%(95% CI, 33%-76%) of cases.