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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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