Categories of visual loss in 1245 Chinese children attending schools for the blind, 1998
| WHO category | Level of visual acuity (better eye) | n | % |
|---|---|---|---|
| No impairment | 6/6–6/18 | 22 | 1.8 |
| Visual impairment | <6/18–6/60 | 92 | 7.4 |
| Severe visual impairment | <6/60–3/60 | 156 | 12.5 |
| Blind | <3/60–NPL | 970 | 77.9 |
| Cannot test (believed blind) | 5 | 0.4 | |
| Total | 1245 | 100 |