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| Optotype (Font) Size | LogMAR | Snellen |
| VF1 | −0.30 | 20/10 |
| VF2 | −0.19 | 20/13 |
| VF3 | −0.13 | 20/15 |
| VF4 | 0.00 | 20/20 |
| VF5 | 0.10 | 20/25 |
| VF6 | 0.18 | 20/30 |
| VF7 | 0.30 | 20/40 |
| VF8 | 0.40 | 20/50 |
Corresponding Snellen and LogMAR visual acuity values of optotypes used in the Validation experiment. These irregularly spaced sizes correspond to the lower eight lines of the standard Snellen chart.
