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 |
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