Aetiology according to timing of insult leading to visual loss
| Aetiology | No | % |
| Hereditary disease | 21 | 9.2 |
| Intrauterine factors | ||
| Toxoplasmosis | 1 | 0.4 |
| Perinatal/neonatal factor | ||
| Cerebral hypoxia | 4 | 1.8 |
| ROP | 96 | 41.9 |
| Postnatal/infancy factor | ||
| Neoplasma | 4 | 1.8 |
| Trauma | 1 | 0.4 |
| Other | 5 | 2.2 |
| Unknown aetiology | ||
| Cataract | 19 | 8.3 |
| Glaucoma | 12 | 5.2 |
| Retinoblastoma | 3 | 1.3 |
| Abnormality since birth | 63 | 27.5 |
| Total | 229 | 100 |