Repeatability and Agreement of Central Corneal Thickness and Keratometry Measurements between Four Different Devices
Table 4
Keratometry measurement differences between the three devices.
Parameter
Device comparison
Pentacam HR versus IOLMaster 700
Pentacam HR versus iDesign
IOLMaster 700 versus iDesign
J0 [D]
Differencea (mean ± SD)
0.033 ± 0.09
0.026 ± 0.09
−0.007 ± 0.07
Range
−0.25–0.27
−0.16–0.31
−0.18–0.12
95% CI
0.009–0.056
0.01–0.05
−0.03–0.01
value
0.009
0.041
0.426
J45 [D]
Differencea (mean ± SD)
−0.011 ± 0.10
−0.015 ± 0.11
0.004 ± 0.06
Range
−0.20–0.23
−0.29–0.25
−0.14–0.11
95% CI
−0.01–0.04
−0.01–0.05
−0.01–0.02
value
0.412
0.325
0.591
Kmean [D]
Differencea (mean ± SD)
0.49 ± 0.11
−0.27 ± 0.26
−0.76 ± 0.25
Range
0.27–0.91
−1.34–0.26
−1.95 to −0.24
95% CI
0.46–0.52
−0.34 to −0.20
−0.83 to −0.69
value
<0.0001
<0.0001
<0.0001
J0: astigmatism 90/180 degrees; J45: astigmatism 45/135 degrees; Kmean: mean keratometry; CI: confidence interval; abetween the mean measurements of each device and of each eye; values were calculated by one-sample t-test.
