From: Transcanalicular laser dacryocystorhinostomy for acquired nasolacrimal duct obstruction: an audit of 104 patients
Exclusion criteria
Congenital obstruction
Neoplastic obstruction
Traumatic obstruction
Canalicular stenosis
Intrasaccal stenosis
Dacryocystocele
Lid anomalies/malposition
Underlying rhinological disease
Prior nasolacrimal surgery