Different lens power calculation formulas for the prediction of refractive outcome after phacoemulsification with silicone oil removal

Table 3 Predictive accuracies of the various IOL power assessment formulas for eyes with long axial length

Formula	Predicted SE, D	Mean prediction error, D^#	P-value†	Absolute error, D
SRK/T	− 0.95 ± 0.63	0.15 ± 1.16	0.121	0.78 ± 0.67
Holladay 1	−1.26 ± 0.63	0.46 ± 1.17	0.015	0.94 ± 0.63
Holladay 2	− 1.08 ± 0.65	0.28 ± 1.11	0.04	0.80 ± 0.62
Haigis	−0.77 ± 0.70	−0.04 ± 1.12	0.355	0.63 ± 0.73
Hoffer Q	−1.28 ± 0.77	0.49 ± 1.09	0.009	0.88 ± 0.63
Barrett Universal II	−1.03 ± 0.68	0.11 ± 0.99	0.268	0.77 ± 0.68
P-value*		0.492		0.594

Values are presented as the mean ± standard deviation. IOL, intraocular lens; SE, spherical equivalent; ^#Postoperative SE - predicted SE. †P-values derived by the Wilcoxon signed-rank test; *P-values* obtained by one-way analysis of variance

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