Comparison of different visual acuity scoring systems
| GAC | Snellen (UK) | Snellen (USA) | logMAR |
| 0.125 | 6/45 | 20/150 | 0.875 |
| 0.2 | 6/38 | 20/127 | 0.8 |
| 0.3 | 6/30 | 20/100 | 0.7 |
| 0.4 | 6/24 | 20/80 | 0.6 |
| 0.5 | 6/19 | 20/63 | 0.5 |
| 0.6 | 6/15 | 20/50 | 0.4 |
| 0.7 | 6/12 | 20/40 | 0.3 |
| 0.8 | 6/9.5 | 20/32 | 0.2 |
| 0.9 | 6/7.5 | 20/25 | 0.1 |
| 1.0 | 6/6 | 20/20 | 0 |
| 1.1 | 6/5 | 20/17 | −0.1 |
| 1.2 | 6/3.75 | 20/12.5 | −0.2 |
| 1.3 | 6/3 | 20/10 | −0.3 |
↵Glasgow acuity cards.