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© HAAG‑STREIT AG, 3098 Koeniz, Switzerland – HS‑Doc. no. 1500.7220686.04020 – 2. Edition / 2021 – 05
6.5.2 Simulated Anterior Keratometry (SimK), standard
topography (7.5 mm diameter)
Reported in-vivo repeatabilities are based on N=32 eyes, including 9 eyes with
irregular corneal shape. In-vivo repeatability is calculated as the standard deviation
of pairwise differences of three repeated measurements per eye for all eyes.
Measurement range SimK:
32.1 - 67.5 dpt
Display resolution SimK:
0.01 dpt
In vivo repeatability SimK
mean
(1. SD):
± 0.22 dpt
In vivo repeatability SimAST (1. SD):
± 0.18 dpt
Measurement range SimAxis:
0 - 180°
Display resolution SimAxis:
1°
In vivo repeatability SimAxis, 0.5 dpt < AST ≤ 1.5 dpt (1. SD): ± 3.7°
In vivo repeatability SimAxis, AST > 1.5 dpt (1. SD):
± 2.1°
Display resolution Corneal Shape Factor:
0.01
In vivo repeatability Corneal Shape Factor:
0.07
6.5.3 Simulated Posterior Keratometry (SimPK), standard
topography (7.5 mm diameter)
Reported in-vivo repeatabilities are based on N=31 eyes, including 8 eyes with
irregular corneal shape. In-vivo repeatability is calculated as the standard deviation
of pairwise differences of three repeated measurements per eye for all eyes.
Measurement range SimPK:
3.9 - 9.5 dpt
Display resolution SimPK:
0.01 dpt
In vivo repeatability SimPK
mean
(1. SD):
± 0.032 dpt
In vivo repeatability SimPAST (1. SD):
± 0.029 dpt
Measurement range SimPAxis:
0 - 180°
Display resolution SimPAxis:
1°
In vivo repeatability SimPAxis, SimPAST > 0.5 dpt (1. SD):
no occurrences
Display resolution Posterior Corneal Shape Factor:
0.01
In vivo repeatability Posterior Corneal Shape Factor:
0.09
6.5.4 Invivo repeatability extended topography (12 mm
diameter)
This repeatability table is based on N=31 eyes (including 8 eyes with irregular
corneal shape), with three measurements per eye.
Area
Center zone
Middle zone
Outer zone
Measurand
Unit
Mean
1)
2 Std.
Dev.
2)
Mean 2 Std.
Dev.
Mean 2 Std.
Dev.
Anterior corneal curvature dpt 0.17
0.32 0.084 0.30 0.063 0.36
Posterior corneal
curvature
dpt 0.025 0.052 0.013 0.056 0.011 0.072
Anterior elevation
μm
–
2.8
–
4.6
–
6.5
Posterior elevation
μm
–
2.7
–
5.5
–
8.9
Pachymetry
μm
–
2.5
–
4.2
–
7.5
Areas indicate the center zone (diameter ≤ 3 mm), middle zone (3 mm < diameter ≤
6 mm) and outer zone (diameter > 6 mm) regions of the cornea.
1) Mean:
Standard deviation of the mean difference between paired data sets.
2) 2 Std. Dev.: Twice the mean of the standard deviation of differences between paired data sets.
