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| Grade | Description |
| A | Sea fan flat with leakage < 1 MPS disc area |
| B | Elevated sea fan with haemorrhage |
| C | Elevated sea fan with partial fibrosis |
| D | Complete sea fan fibrosis without well demarcated vessels |
| E | Complete sea fan fibrosis with well demarcated vessels |
MPS: Macular Photocoagulation Study; PSR: proliferative sickle retinopathy
