| Foot | Metre | Decimal | LogMAR |
|---|---|---|---|
| 20/200 | 6/60 | 0.10 | 1.00 |
| 20/160 | 6/48 | 0.125 | 0.90 |
| 20/125 | 6/38 | 0.16 | 0.80 |
| 200/100 | 6/30 | 0.20 | 0.70 |
| 20/80 | 6/24 | 0.25 | 0.60 |
| 20/63 | 6/19 | 0.32 | 0.50 |
| 20/50 | 6/15 | 0.40 | 0.40 |
| 20/40 | 6/12 | 0.50 | 0.30 |
| 20/32 | 6/9.5 | 0.63 | 0.20 |
| 20/25 | 6/7.5 | 0.80 | 0.10 |
| 20/20 | 6/6 | 1.00 | 0.00 |
| 20/16 | 6/4.8 | 1.25 | -0.10 |
| 20/12.5 | 6/3.8 | 1.60 | -0.20 |
| 20/10 | 6/3 | 2.00 | -0.30 |