Sensitivity and specificity to identify optic discs as abnormal at different cut off values for cup/disc ratio (CDR) (independent of disc size)
| CDR (cut off) | Specificity (%) | Sensitivity (%) |
|---|---|---|
| 0.50 | 67.0 | 94.3 |
| 0.55 | 79.5 | 90.6 |
| 0.60 | 90.9 | 84.9 |
| 0.65 | 97.7 | 75.5 |
| 0.70 | 98.9 | 45.3 |