Conversion Table for Representation of Visual Acuity
Visual Acuity values are represented in decimal, fraction (in feet or meters) and log MAR. Use the table below for conversion between them.
| 20 ft | 6 m | Decimal | 4 m | Log MAR |
|---|---|---|---|---|
| 20 / 630 | 6 / 190 | 0.032 | 4 / 125 | +1.5 |
| 20 / 500 | 6 / 150 | 0.04 | 4 / 100 | +1.4 |
| 20 / 400 | 6 / 120 | 0.05 | 4 / 80 | +1.3 |
| 20 / 320 | 6 / 95 | 0.06 | 4 / 63 | +1.2 |
| 20 / 250 | 6 / 75 | 0.08 | 4 / 50 | +1.1 |
| 20 / 200 | 6 / 60 | 0.1 | 4 / 40 | +1.0 |
| 20 / 160 | 6 / 48 | 0.125 | 4 / 32 | +0.9 |
| 20 / 125 | 6 / 38 | 0.16 | 4 / 25 | +0.8 |
| 20 / 100 | 6 / 30 | 0.2 | 4 / 20 | +0.7 |
| 20 / 80 | 6 / 24 | 0.25 | 4 / 16 | +0.6 |
| 20 / 63 | 6 / 19 | 0.32 | 4 / 12.5 | +0.5 |
| 20 / 50 | 6 / 15 | 0.4 | 4 / 10 | +0.4 |
| 20 / 40 | 6 / 12 | 0.5 | 4 / 8 | +0.3 |
| 20 / 32 | 6 / 9.5 | 0.63 | 4 / 6.3 | +0.2 |
| 20 / 25 | 6 / 7.5 | 0.8 | 4 / 5 | +0.1 |
| 20 / 20 | 6 / 6 | 1.0 | 4 / 4 | 0 |
| 20 / 16 | 6 / 4.8 | 1.25 | 4 / 3.2 | -0.1 |
| 20 / 12.5 | 6 / 3.8 | 1.6 | 4 / 2.5 | -0.2 |
| 20 / 10 | 6 / 3 | 2.0 | 4 / 2 | -0.3 |