Table 3.

Comparison of corneal astigmatism values between devices.

Device	Correlation between devices (P)			Mean difference (D) ± SD			95% CI			95% of LoA spread (D)
	Magnitude	Cardinal component	Oblique component	Magnitude	Cardinal component	Oblique component	Magnitude	Cardinal component	Oblique component	Magnitude	Cardinal component	Oblique component
IOLMaster vs. iTrace	0.853 (<0.0001)	0.965 (<0.0001)	0.920 (<0.0001)	0.03 ± 0.47	−0.09 ± 0.48	0.08 ± 0.34	−0.07, 0.13	−0.19, 0.01	0.01, 0.15	1.84	1.89	1.32
IOLMaster vs. Pentacam	0.870 (<0.0001)	0.957 (<0.0001)	0.839 (<0.0001)	0.05 ± 0.45	0.07 ± 0.53	0.00 ± 0.50	−0.04, 0.15	−0.04, 0.18	−0.10, 0.11	1.77	2.08	1.97
iTrace vs. Pentacam	0.881 (<0.0001)	0.967 (<0.0001)	0.868 (<0.0001)	0.02 ± 0.42	0.16 ± 0.46	−0.08 ± 0.45	−0.07, 0.11	0.07, 0.26	−0.17, 0.01	1.66	1.78	1.76

CI = confidence interval; D = diopters; LoA = limit of agreement; SD = standard deviation.