Percentage of patients with photographs being reported as ungradable (technical failures)
| Undilated single field photographs | Dilated single field photographs | Dilated multiple field photographs | |
|---|---|---|---|
| Right eye only | 25% | 4% | 4% |
| Left eye only | 27% | 6% | 5.5% |
| Either eye | 36% | 7% | 6.5% |