Visual acuity | Number of eyes | Percentage | |||||
---|---|---|---|---|---|---|---|
Maximum | Minimum | ||||||
6/6 | 7 | 7.7% | |||||
No impairment | 6/9 | 6/18 | 8 | 8.8% | |||
Category 1 (visual impairment) | 6/18 | 6/60 | 5 | 5.5% | |||
Category 2 (severe visual impairment) | 6/60 | 3/60 | 7 | 7.7% | |||
Category 3 (blind) | 3/60 | 1/60 | 11 | 12% | |||
Category 4 (blind) | CF | PL | 19 | 20.8% | |||
Category 5 (blind) | NPL | 34 | 37.3% |
↵Adapted from WHO categories of visual impairment.19
CF = finger counting; PL = perception of light; NPL = no perception of light.