Results of dacryocystography compared with lacrimal drainage scintigraphy in the investigation of functional nasolacrimal duct obstruction
| Dacryocystography | Lacrimal drainage scintigraphy | |||
|---|---|---|---|---|
| presac delay | preduct delay | intraduct delay | free drainage | |
| Hold up of contrast on erect film | 7 | 17 | 25 | 2 |
| Clearance of contrast on erect film | 0 | 2 | 1 | 1 |