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C
200
Z
O
100
N
O
H
70
S
D
H
O
50
H
D
N
O
C
40
O
R
Z
V
D
N
30
C
K
N
S
K
D
25
Z
D
K
R
O
R
20
D
R
Z
O
Z
V
15
O
S
C
O
N
S
10
Sizes are estimated — tap to calibrate your screen for accurate optotypes
20/200
6/60 · logMAR 1.0 · at 40 cm
40 cm
1 m
3 m
6 m
Letters
Tumbling E
Landolt C
Numbers
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