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 | ||
*Visual field restriction criteria applicable even if visual acuity is better than for that category of visual impairment.