Table 2.
Causes of unilateral blindness and visual impairment
| <6/18–6/60 (VI) | <6/60–3/60 (SVI) | <3/60 (Blind) | All subjects | |||||
|---|---|---|---|---|---|---|---|---|
| Avoidable | 27 | 87.1% | 8 | 80.0% | 35 | 92.1% | 70 | 88.6% |
| Preventable | 2 | 6.5% | 1 | 10.0% | 15 | 39.5% | 18 | 22.8% |
| Trauma | 1 | 3.2% | 0 | 0.0% | 14 | 36.8% | 15 | 19.0% |
| Intrauterine infection | 1 | 3.2% | 1 | 10.0% | 0 | 0.0% | 2 | 2.5% |
| Corneal scar | 0 | 0.0% | 0 | 0.0% | 1 | 2.6% | 1 | 1.3% |
| Treatable | 25 | 80.6% | 7 | 70.0% | 20 | 52.6% | 52 | 65.8% |
| Refractive error | 18 | 58.1% | 1 | 10.0% | 2 | 5.3% | 21 | 26.6% |
| Amblyopia—refractive | 4 | 12.9% | 0 | 0.0% | 4 | 10.5% | 8 | 10.1% |
| Amblyopia—strabismic | 2 | 6.5% | 4 | 40.0% | 2 | 5.3% | 8 | 10.1% |
| Cataract-related | 0 | 0.0% | 2 | 20.0% | 6 | 15.8% | 8 | 10.1% |
| Corneal infection | 0 | 0.0% | 0 | 0.0% | 4 | 10.5% | 4 | 5.1% |
| Vernal keratoconjunctivitis | 1 | 3.2% | 0 | 0.0% | 1 | 2.6% | 2 | 2.5% |
| Subluxed lens | 0 | 0.0% | 0 | 0.0% | 1 | 2.6% | 1 | 1.3% |
| Unavoidable | 4 | 12.9% | 2 | 20.0% | 3 | 7.9% | 9 | 11.4% |
| Optic nerve atrophy | 3 | 9.7% | 1 | 10.0% | 2 | 5.3% | 6 | 7.6% |
| Albinism | 0 | 0.0% | 1 | 10.0% | 0 | 0.0% | 1 | 1.3% |
| Anterior segment dysgenesis | 0 | 0.0% | 0 | 0.0% | 1 | 2.6% | 1 | 1.3% |
| Unknown | 1 | 3.2% | 0 | 0.0% | 0 | 0.0% | 1 | 1.3% |
| Total | 31 | 100.0% | 10 | 100.0% | 38 | 100.0% | 79 | 100.0% |
VI, visual impairment; SVI, severe visual impairment.