WHO category of vision of the participants
| WHO category | Level of vision | N | % | |
|---|---|---|---|---|
| 1 | No impairment | 6/6–6/18 | 0 | 0 |
| 2 | Visual impairment | <6/18–6/60 | 3 | 2.4 |
| 3 | Severe visual impairment | <6/60–3/60 | 11 | 8.7 |
| 4 | Blind | <3/60-PL | 48 | 37.8 |
| 5 | Blind | NPL | 65 | 51.1 |
| Total | 127 | 100 |
NPL, no perception of light; PL, perception of light.