Principal causes of blindness in eyes
| Principal cause | Eyes of bilaterally blind people | Eyes of unilaterally blind people | All blind eyes |
| N (%) | N (%) | N (%) | |
| Cataract | 228 (48.1) | 228 (50.7) | 456 (49.4) |
| Refractive error | 149 (31.4) | 58 (12.9) | 207 (22.4) |
| Corneal opacity | 18 (3.8) | 33 (7.3) | 51 (5.5) |
| Retinal disorders | 19 (4.0) | 13 (2.9) | 32 (3.4) |
| Glaucoma | 4 (0.8) | 21 (4.7) | 25 (2.7) |
| Globe disorders | 2 (0.4) | 4 (0.9) | 6 (0.7) |
| Amblyopia | 1 (0.2) | 8 (1.8) | 9 (1.0) |
| Optic atropy | 0 (0.0) | 2 (0.4) | 2 (0.2) |
| Other/undetermined | 51 (10.7) | 83 (18.4) | 134 (14.5) |
| Missing | 2 (0.4) | 0 (0.0) | 2 (0.2) |
| Total | 474 (100.0) | 450 (100.0) | 924 (100.0) |