Table 4.

Summary of previous studies on the predictability of intraocular lens power calculation in eyes with steep and flat corneas.

Author	Number of eyes	Mean keratometric readings (D)	IOL calculation formula	Prediction error (D)	Within ± 0.5 D (%)	Within ± 1.0 D (%)
Faramarzi et al [9]	45	46≦	SRK/T	−0.06 ± 0.52	78	89
			Holladay1	0.21 ± 0.51	64	96
			Haigis	0.16 ± 0.55	64	93
			Hoffer Q	0.36 ± 0.51	58	91
Reitblat et al [10]	79	46<	Barrett Universal II	−0.04 ± 0.45	76	96
			SRK/T	−0.31 ± 0.54	61	91
			Hill-RBF	−0.17 ± 0.35	83	98
			Hoffer Q	0.18 ± 0.57	70	92
			Holladay1	−0.06 ± 0.52	70	94
			Holladay2	−0.04 ± 0.51	73	96
			Olsen-A	0.07 ± 0.41	78	99
			Olsen-C	0.18 ± 0.41	68	99
			Haigis	0.17 ± 0.42	71	97
	92	<42	Barrett Universal II	−0.07 ± 0.26	97	100
			SRK/T	0.16 ± 0.31	86	100
			Hill-RBF	−0.14 ± 0.26	88	100
			Hoffer Q	−0.22 ± 0.68	80	96
			Holladay1	0.04 ± 0.39	83	99
			Holladay2	−0.02 ± 0.35	86	99
			Olsen-A	−0.06 ± 0.31	91	98
			Olsen-C	−0.17 ± 0.33	90	99
			Haigis	−0.31 ± 0.31	75	97
Current	86	47≦	Barrett Universal II	0.08 ± 0.49	71	97
			SRK/T	−0.49 ± 0.63	60	84
	69	<42	Barrett Universal II	0.15 ± 0.42	74	96
			SRK/T	0.27 ± 0.40	70	94