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© HAAG‑STREIT AG, 3098 Koeniz, Switzerland – HS‑Doc. no. 1500.7220686.04020 – 2. Edition / 2021 – 05
6.5.5 Simulated Anterior Keratometry (SimEK), extended
topography (12 mm diameter)
Reported in-vivo repeatabilities are based on N=30 eyes, including 7 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 SimEK:
32.1 - 67.5 dpt
Display resolution SimEK:
0.01 dpt
In vivo repeatability SimEK
mean
(1. SD):
± 0.14 dpt
In vivo repeatability SimEAST (1. SD):
± 0.095 dpt
Measurement range SimEAxis:
0 - 180°
Display resolution SimEAxis:
1°
In vivo repeatability SimEAxis, 0.5 dpt < AST ≤ 1.5 dpt (1.
SD):
± 2.6°
In vivo repeatability SimEAxis, AST > 1.5 dpt (1. SD):
± 2.4°
Display resolution Corneal Shape Factor:
0.01
In vivo repeatability Corneal Shape Factor:
0.05
6.5.6 Simulated Posterior Keratometry (SimEPK), extended
topography (12 mm diameter)
Reported in-vivo repeatabilities are based on N=29 eyes, including 6 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 SimEPK:
3.9 - 9.5 dpt
Display resolution SimEPK:
0.01 dpt
In vivo repeatability SimEPK
mean
(1. SD):
± 0.019 dpt
In vivo repeatability SimEPAST (1. SD):
± 0.023 dpt
Measurement range SimEPAxis:
0 - 180°
Display resolution SimEPAxis:
1°
In vivo repeatability SimEPAxis, SimEPAST > 0.5 dpt (1. SD): no occurrences
Display resolution Posterior Corneal Shape Factor:
0.01
In vivo repeatability Posterior Corneal Shape Factor:
0.06
6.5.7 Normative considerations:
Eyestar 900 complies with the standard EN ISO 19980:2012 for corneal topography
systems, type A.
6.5.8 Cristalline lens tilt
Reported in-vivo repeatabilities are based on N=28 phakic eyes (one eye per
subject). In-vivo repeatability is calculated as the standard deviation of pairwise
differences of three repeated measurements per eye for all eyes.
Crystalline lens tilt
measurand
unit
measured in-vivo
repeatability base on
standard topograhy (7.5
mm)
measured in-vivo
repeatability base on
extended topograhy (12
mm)
Lens tilt, axial angle
°
0.1
0.1
Lens tilt, rotational
angle
°
2.3
1.8
Lens decentration X,
Lens DX
μm
10.3
8.4
Lens decentration Y,
Lens DY
μm
8.7
7.1
7 Software / Help menu / Error messages
The software’s help section contains instructions and help for performing an
examination and descriptions of the error messages. The help can be opened via
the F1 key or in the [?] – [Help] menu.
