[1]Department of Ophthalmology;
Korea University College of Medicine;
Seoul 02841;
Korea;
[1]Department of Ophthalmology;
Korea University College of Medicine;
Seoul 02841;
Korea;
[1]Department of Ophthalmology;
Korea University College of Medicine;
Seoul 02841;
Korea;
[1]Department of Ophthalmology;
Korea University College of Medicine;
Seoul 02841;
Korea;
[1]Department of Ophthalmology;
Korea University College of Medicine;
Seoul 02841;
Korea;
computed tomography; nasolacrimal duct obstruction; nasolacrimal duct volume;