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Level of lacrimal drainage obstruction as detected by CTDCG and clinical tests
| Level of obstruction | *Clinical testes (%) | CTDCG (%) |
|---|---|---|
| Lower canaliculus | 12 | 12 |
| Common canaliculus | 20 | 20 |
| Lacrimal sac | 12 | 12 |
| Lacrimal sac to NLD junction | 56 | |
| proximal NLD obstruction | 40 | |
| Distal NLD | 16 |
*Clinical testing including: inspection of punctum, palpation of the lacrimal sac, regurgitation test, syringing (irrigation), and diagnostic probing
