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

Table 2 Predictive accuracies of the various IOL power assessment formulas for eyes with normal axial length

Formula	Predicted SE, D	Mean prediction error, D^#	P-value†	Absolute error, D
SRK/T	−0.40 ± 0.38	−0.18 ± 0.92	0.16	0.74 ± 0.53
Holladay 1	− 0.46 ± 0.42	−0.15 ± 0.88	0.17	0.73 ± 0.49
Holladay 2	−0.55 ± 0.46	−0.06 ± 0.94	0.39	0.73 ± 0.56
Haigis	− 0.45 ± 0.48	−0.15 ± 0.87	0.19	0.72 ± 0.49
Hoffer Q	− 0.54 ± 0.51	−0.05 ± 0.90	0.39	0.71 ± 0.54
Barrett Universal II	− 0.52 ± 0.46	− 0.06 ± 0.90	0.32	0.72 ± 0.52
P-value*		0.983		0.999

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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