Causes of incident vision loss in the better-seeing eye
| PVI | BCVI | |||||||
| Mild VI | MSVI | Blindness | Any VI | Mild VI | MSVI | Blindness | Any VI | |
| Cataract | 72 (50.0) | 135 (77.1) | 18 (78.3) | 164 (48.3) | 163 (96.4) | 118 (88.7) | 8 (80.0) | 312 (90.9) |
| Refractive error | 59 (41.0) | 14 (8.0) | 0 | 151 (44.4) | 0 | 0 | 0 | 0 |
| Posterior capsule opacity | 1 (0.7) | 7 (4.0) | 1 (4.3) | 4 (1.2) | 4 (2.4) | 3 (2.3) | 1 (10.0) | 13 (3.8) |
| Macular degeneration | 0 | 6 (3.4) | 1 (4.3) | 0 | 0 | 3 (2.3) | 0 | 2 (0.6) |
| Diabetic retinopathy | 0 | 0 | 0 | 1 (0.3) | 0 | 2 (1.5) | 0 | 3 (0.9) |
| Optic neuropathy | 0 | 0 | 1 (4.3) | 0 | 0 | 0 | 0 | 1 (0.3) |
| Other retinopathies | 5 (3.5) | 8 (4.6) | 1 (4.3) | 7 (2.1) | 1 (0.6) | 4 (3.0) | 1 (10.0) | 6 (1.8) |
| Corneal opacity | 0 | 1 (0.6) | 0 | 0 | 0 | 1 (0.8) | 0 | 1 (0.3) |
| Other reasons | 0 | 4 (2.3) | 1 (4.3) | 1 (0.3) | 0 | 1 (0.8) | 0 | 2 (0.6) |
| Undetermined | 7 (4.9) | 0 | 0 | 12 (3.5) | 1 (0.6) | 1 (0.8) | 0 | 3 (0.9) |
| Total | 144 (100) | 175 (100) | 23 (100) | 340 (100) | 169 (100) | 133 (100) | 10 (100) | 343 (100) |
Other retinopathies included macular hole, epiretinal membrane, central serous chorioretinopathy and retinal vein occlusion.
BCVI, best-corrected VI; MSVI, moderate and serve VI; PVI, presenting VI; VI, visual impairment.