Category of visual impairment | Presenting visual acuity | Or central visual field* | Classified as | |
---|---|---|---|---|
 | Maximum less than | Minimum equal to or better than |  |  |
1 | 6/12 0.50 20/40 | 6/18 0.33 20/60 | Â | Mild visual impairment |
2 | 6/18 0.33 20/60 | 6/60 0.10 20/200 | Â | Moderate visual impairment |
3 | 6/60 0.10 20/200 | 3/60 0.05 20/400 | 20° or less but more than 10° | Blindness |
4 | 3/60 0.05 20/400 | 1/60 (finger counting at 1 metre) 0.02 5/300 (20/1200) | 10° or less but more than 5° | Severe blindness |
5 | 1/60 (finger counting at 1 metre) 0.02 5/300 | Light perception | 5° or less | Very severe blindness |
6 | No light perception | Â | Total blindness | |
9 | Unspecified | Â | Unspecified |