Accuracy of Intraocular Lens Power Formulas Involving 148 Eyes with Long Axial Lengths: A Retrospective Chart-Review Study

Table 2

Absolute error (D) for each formula.

Formula	Median absolute error^†	95% CI	Range	value^‡
Haigis	1.025	1.297–1.816	0.01–5.92	/
Hoffer Q	1.635	1.925–2.042	0.04–7.37	<0.001
Holladay 1	1.435	1.610–2.149	0.04–6.87	<0.001
SRK/T	1.040	1.479–2.042	0.04–6.61	0.002

Absolute error = actual postoperative spherical equivalent − predicted spherical equivalent.
^‡Compared with results achieved using the Haigis formula (repeated-measures ANOVA).
D, diopters; CI, confidence interval.
indicates ; indicates .