Table 3.

Predicted IOL power for studied formulas based on pre-dilation and post-dilation measurements for method A (lowest myopic spheroequivalent residual refraction, LMP) and actual IOL power for studied formulas based on pre-dilation and post-dilation measurements for method B (ideal power for emmetropia, IPE)

IOL power formula	Mean ± SD		Mean difference	95% CI for mean difference	p value
	Pre-dilation	Post-dilation
Method A
Barrett Universal II	19.68 ± 3.63	19.80 ± 3.64	0.123 ± 0.238	0.076, 0.169	< 0.001**
Olsen	19.65 ± 3.62	19.79 ± 3.61	0.142 ± 0.257	0.092, 0.193	< 0.001**
Hill-RBF	19.77 ± 3.65	19.86 ± 3.64	0.088 ± 0.238	0.042, 0.135	< 0.001**
Haigis	19.88 ± 3.71	19.99 ± 3.70	0.108 ± 0.250	0.059, 0.157	< 0.001**
Holladay I	19.80 ± 3.78	19.81 ± 3.77	0.010 ± 0.244	− 0.038, 0.058	0.26
SRK/T	19.78 ± 3.65	19.77 ± 3.63	− 0.010 ± 0.233	− 0.056, 0.036	0.81
Method B
Barrett Universal II	19.40 ± 3.58	19.43 ± 3.57	0.030 ± 0.215	− 0.013, 0.073	0.16
Olsen	19.39 ± 3.54	19.47 ± 3.53	0.076 ± 0.233	0.030, 0.123	0.002
Hill-RBF	19.49 ± 3.58	19.52 ± 3.58	0.021 ± 0.216	− 0.022, 0.064	0.35
Haigis	19.56 ± 3.63	19.61 ± 3.66	0.055 ± 0.259	0.003, 0.107	0.04
Holladay I	19.57 ± 3.74	19.57 ± 3.74	0.005 ± 0.213	− 0.038, 0.047	0.82
SRK/T	19.44 ± 3.57	19.45 ± 3.57	0.002 ± 0.189	− 0.035, 0.040	0.89

**p value confirmed with Wilcoxon signed-rank test