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Installation, Features, & Functions
Size Progressions
Optotype sizes are presented in the table below for the LogMAR , Standard and Linear/Decimal
Progressions. The default progression is the LogMAR Scale and the default Notation is Decimal. The
table below indicates the LogMAR Scale and the equivalent Decimal, Snellen and Snellen Metric opto-
types sizes.
LogMAR Scale
-0.3
-0.2
-0.1
0.0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
1.0
1.1
1.2
1.3
The Standard Progression presents visual acuity sizes as Snellen fractions.
Snellen
20/10
2015
20/20
20/25
20/30
20/40
20/50
20/60
20/70
20/80
20/100
20/200
20/400
13785-101 Rev. F
Acuity Grade
Decimal LogMAR
2.00
1.60
1.25
1.00
0.80
0.63
0.50
0.40
0.32
0.25
0.20
0.16
0.125
0.10
0.08
0.063
0.05
Snellen (Decimal)
2.00
1.33
1.00
0.80
0.667
0.50
0.40
0.33
0.286
0.25
0.20
0.10
0.05
(continued)
Snellen
Snellen (Metric)
20/10
20/12.5
20/16
20/20
20/25
20/32
20/40
20/50
20/63
20/80
20/100
20/125
20/160
20/200
20/250
20/320
20/400
Snellen (Metric)
6/3.0
6/4.5
6/6.0
6/7.5
6/9.0
6/12.0
6/15.0
6/18.0
6/21.0
6/24.0
6/30.0
6/60.0
6/120
6/3.0
6/3.8
6/4.8
6/6.0
6/6.75
6/9.5
6/12
6/15
6/19
6/24
6/30
6/38
6/48
6/60
6/76
6/96
6/120
25
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