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
p 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
p 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
p 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; p values were calculated by one-sample t-test.