Evaluation of Tear Stability and Ocular Surface in Patients Undergoing External Endonasal Dacryocystorhinostomy (EE-DCR) for Primary Acquired Nasolacrimal Duct Occlusion (PANDO).

The aim of our study was to show the changes in ocular surface and tear film parameters of patients who underwent external endonasal dacryocystorhinostomy (EE-DCR). For this purpose, tear film break-up time, corneal staining score, ocular surface disease index (OSDI), and Schirmer I test were performed preoperatively and postoperatively. The data obtained were compared with healthy controls. In the preoperative period, ocular surface disease index scores and corneal staining scores were higher, and Schirmer 1 and tear film break-up time were lower in group 1 compared with group 2. The ocular surface parameters were similar between the groups in the first and third postoperative months. External endonasal dacryocystorhinostomy is an important method for the restoration of deteriorated tear stability. Restoration of these disorders may be an important determinant of patient satisfaction and visual quality after surgery.