Avoidable causes of visual impairment
| Causes | No. of patients | Percentage of patients | Consanguinity rates N (%) |
|---|---|---|---|
| Treatable | 293 | 42.2 | 55 (18.8) |
| Cataract/subluxated crystalline lens | 95 | 13.7 | 21 (22.1) |
| Retinopathy of prematurity | 48 | 6.9 | 4 (8.3) |
| Refractive amblyopia | 40 | 5.8 | 5 (12.5) |
| Aphakic glaucoma | 24 | 3.5 | 3 (12.5) |
| Secondary optic atrophy (secondary to hydrocephalus, medulloblastoma, and craniopharyngioma) | 22 | 3.2 | 5 (22.7) |
| Congenital glaucoma | 20 | 2.9 | 9 (45.0) |
| Corneal disease (keratoconus, corneal dystrophies, corneal opacity or scarring) | 13 | 1.9 | 3 (23.1) |
| Spontaneous retinal detachment | 10 | 1.4 | 3 (30.0) |
| Retinitis | 8 | 1.2 | – |
| Meningitis | 5 | 0.7 | 1 (20.0) |
| Congenital ptosis | 5 | 0.7 | 1 (20.0) |
| Uveitis | 3 | 0.4 | – |
| Preventable | 136 | 19.6 | 73 (53.7) |
| Genetic diseases | 132 | 19.0 | 72 (54.5) |
| Prenatal/perinatal infections | 4 | 0.6 | 1 (25.0) |