Table 4: Keratometry measurement differences between the three devices.

ParameterDevice comparison
Pentacam HR
versus
IOLMaster 700
Pentacam HR
versus
iDesign
IOLMaster 700
versus
iDesign

J0 [D]
 Differencea
(mean ± SD)
0.033 ± 0.090.026 ± 0.09−0.007 ± 0.07
 Range−0.25–0.27−0.16–0.31−0.18–0.12
 95% CI0.009–0.0560.01–0.05−0.03–0.01
value0.0090.0410.426
J45 [D]
 Differencea
(mean ± SD)
−0.011 ± 0.10−0.015 ± 0.110.004 ± 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
value0.4120.3250.591
Kmean [D]
 Differencea
(mean ± SD)
0.49 ± 0.11−0.27 ± 0.26−0.76 ± 0.25
 Range0.27–0.91−1.34–0.26−1.95 to −0.24
 95% CI0.46–0.52−0.34 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.