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ICD-10 classification of visual impairment [19].
| Category of visual impairment | Visual acuity | ||
|---|---|---|---|
| Worse than | Equal to/better than | ||
| 0 | Mild/none | N/A | 6/18 |
| 1 | Moderate | 6/18 | 6/60 |
| 2 | Severe | 6/60 | 3/60 |
| 3 | Blindness | 3/60 | 1/60 |
| 4 | Blindness | 1/60 | Light perception |
| 5 | Blindness | No light perception | N/A |
N/A Not applicable
