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WHO categories of visual impairment. Distribution of visual acuity
| WHO category | Level of visual acuity (better eye) | No | % |
| Blind | NPL | 6 | 3.7 |
| Blind | <3/60-PL | 153 | 92.7 |
| Severe visual impairment | <6/60 to 3/60 | 6 | 3.6 |
| Visual impairment | <6/18 to 6/60 | 0 | 0 |
| No impairment | 6/18 or better | 0 | 0 |
| Total | 165 | 100.0 |
NPL = no perception of light; PL = perception of light.
