Table 1 Definition of VI and blindness according to the World Health Organisation and the International Classification of Disease (ICD-10) currently applied in Germany (based on Snellen charts)
From: What explains health in persons with visual impairment?
WHO category of VI | VA with best possible correction | ICD-10-GM | |
|---|---|---|---|
| Â | Maximum less than | Minimum equal to or better than | Â |
Mild or no VI (0) | Â | 20/63 | Mild or no VI |
Moderate VI (1) | 20/63 | 20/200 | Moderate VI |
Severe VI (2) | 20/200 | 1/20 | Severe VI |
Blindness (3) | 1/20 | 1/50 | High-grade VI |
Blindness (4) | 1/50 | Light perception | Blindness |
Blindness (5) | No light perception | No light perception | Blindness |