視力 0.1 => MAR = 10,代表E的缺口有10分角的大小。
Log MAR即取 MAR的log值(10的對數)
所以: 視力 0.1 => MAR = 10 => Log MAR = 1
依此類推
Snellen VA = 2.0 => MAR = 0.5 => Log MAR = -0.3
Snellen VA = 1.0 => MAR = 1 => Log MAR = 0
Snellen VA = 0.8 => MAR = 1.25 => Log MAR = 0.1
Snellen VA = 0.6 => MAR = 1.25 => Log MAR = 0.23
Snellen VA = 0.4 => MAR = 2.5 => Log MAR = 0.4
Snellen VA = 0.2 => MAR = 5 => Log MAR = 0.7
Snellen VA = 0.1 => MAR = 10 => Log MAR = 1
Snellen VA = 0.01 => MAR = 100 => Log MAR = 2
Snellen VA = 0 => MAR = ∞ => Log MAR = ∞