Table 2.

IOL prediction error for each formula

	IOL prediction error (RK), (n=25)
	Arithmetic median (D)	Arithmetic range (D)	Absolute median (D)	Absolute range (D)
Atlas	0.86 (−0.17, 1.61)	−6.73 to 4.13	1.6 (0.85, 2.28)	0.00–6.73
IOLMaster/Lenstar	−0.02 (−0.46, 0.38)	−1.49 to 3.54	0.75 (0.37, 1.21)	0.02–3.54
Barrett True-K	0.14 (−0.22 to 0.54)	−1.35 to 1.72	0.56 (0.25, 1.04)	0.03–1.72
ASCRS Average power	0.23 (−0.054, 0.76)	−2.18 to 2.38	0.63 (0.24, 1.00)	0.02–2.38
ASCRS Maximum power	−0.48 (−1.06, −0.22)	−6.73 to 0.56	0.56 (0.25, 1.06)	0.00–6.73

ASCRS=American Society of Cataract and Refractive Surgery, IOL=Intraocular lens, RK=Radial keratotomy