Table 3 Our recommendation for the categories of severity of visual impairment in the International Statistical Classification of Diseases.
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 | Mild visual impairment | |
2 | 6/18 0.33 20/60 | 6/60 0.10 20/200 | 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 | Total blindness | ||
9 | Unspecified | Unspecified | ||