Causes of bilateral blindness and bilateral visual impairment (VI) with available correction
| Gao'an | Xin'gan | Wan'zai | |||||||
| Blindness (%) | SVI (%) | VI (%) | Blindness (%) | SVI (%) | VI (%) | Blindness (%) | SVI (%) | VI (%) | |
| n=70 | n=67 | n=304 | n=69 | n=48 | n=223 | n=46 | n=36 | n=146 | |
| Uncorrected refractive error | 3 | 21 | 45 | 1 | 6 | 48 | 0 | 8 | 43 |
| Cataract, untreated | 61 | 48 | 41 | 46 | 40 | 26 | 50 | 58 | 36 |
| Aphakia, uncorrected | 0 | 2 | 1 | 1 | 0 | 1 | 7 | 3 | 1 |
| Cataract surgical complications | 1 | 0 | 1 | 0 | 0 | 1 | 0 | 0 | 1 |
| Phthysis and corneal scar | 13 | 2 | 2 | 10 | 2 | 1 | 4 | 3 | 0 |
| Myopic Retinopathy | 6 | 12 | 3 | 12 | 13 | 4 | 11 | 11 | 5 |
| Other posterior segment | 16 | 16 | 8 | 29 | 40 | 20 | 28 | 17 | 13 |
| Total posterior segment | 22 | 28 | 11 | 41 | 53 | 24 | 39 | 28 | 19 |
| Total avoidable | 78 | 72 | 89 | 59 | 47 | 76 | 61 | 72 | 181 |
SVI, severe visual impairment.