Weighted percentage distribution of principal causes of presenting impairment and blindness in people
| Principal cause* | Vision impairment (VI) | Unilateral blindness (UL) | Bilateral blindness (MB and SB) |
|---|---|---|---|
| *Cause in one or both eyes, thus percentage totals exceed 100%. | |||
| Refractive error | 68.9 | 16.2 | 0 |
| Cataract | 23.7 | 44.5 | 51.7 |
| Macular degeneration | 4.7 | 18.4 | 27.1 |
| Glaucoma | 2.1 | 7.3 | 7.7 |
| Corneal opacity | 2.1 | 5.3 | 9.2 |
| Retinal abnormalities | 1.5 | 9.2 | 4.0 |
| High myopia | 0.7 | 3.6 | 10.3 |
| Others | 0.4 | 4.3 | 2.5 |
| Globe (absent/phthisical) | 0 | 4.9 | 7.1 |
| Optic atrophy | 0.3 | 3.1 | 2.1 |
| PCO/after cataract | 0.9 | 1.7 | 0 |
| Undetermined | 0.7 | 1.3 | 0 |