Comparison of Repeatability and Agreement between Swept-Source Optical Biometry and Dual-Scheimpflug Topography

Table 2

Comparison of biometric measurements obtained using two new optical biometry devices in the study subjects.

Parameters	IOLMaster 700	Galilei G6	value	Mean difference ± SD	95% limits of agreement
AL (mm)	24.54 ± 2.08	24.53 ± 2.07	0.413	0.01 ± 0.10	−0.19, 0.21
ACD (mm)	3.35 ± 0.39	3.31 ± 0.47	0.115	0.05 ± 0.24	−0.42, 0.52
Kf (D)	43.10 ± 2.07	42.95 ± 2.04	0.012	0.15 ± 0.58	−0.99, 1.29
Ks (D)	44.21 ± 2.08	44.13 ± 2.08	0.116	0.08 ± 0.51	−0.91, 1.08
Km (D)	43.65 ± 2.01	43.54 ± 2.03	0.008	0.11 ± 0.43	−0.73, 0.95
WTW (mm)	11.98 ± 0.41	11.92 ± 0.45	0.058	0.07 ± 0.36	−0.64, 0.76
CCT (μm)	541.27 ± 33.95	552.95 ± 34.35	<0.001	−11.68 ± 9.72	−30.73, 7.37
LT (mm)	4.12 ± 0.79	4.07 ± 0.62	0.352	0.04 ± 0.43	−0.80, 0.88

Using a paired t-test in the case of normally distributed variables and by the Wilcoxon signed-rank test in the case of nonnormally distributed variables. Limits of agreement is defined as mean difference ± 1.96 standard deviations. SD: standard deviation; AL: axial length; ACD: anterior chamber depth; Kf: flat keratometry; Ks: steep keratometry; Km: mean keratometry; WTW: white-to-white corneal diameter; CCT: central corneal thickness; LT: lens thickness.