Table 6.

Refractive outcomes in the very long eyes, 25.0 mm and longer (n = 53)

Formula	Optimized constant	MPE ± SD (D)	MedAE (D)	MAE (D)	MaxAE (D)	PE (%) <
						0.25 D	0.50 D	0.75 D	1.00 D
New formulas
B II	2.00	−0.09 ± 0.332	0.23	0.27	1.09	56.1	91.2	96.5	98.2
BTAL	1.97	−0.05 ± 0.327	0.24	0.26	0.86	50.9	90.6	96.2	100.0
EVO	119.12	0.08 ± 0.343	0.22	0.28	0.85	56.6	81.1	98.1	100.0
Hill-RBFa	119.22	−0.18 ± 0.348	0.28	0.29	1.48	49.1	86.8	94.3	98.1
Hoffer QST	5.72	−0.06 ± 0.339	0.19	0.27	1.12	54.7	86.8	98.1	98.1
HOL2	5.65	0.17 ± 0.347	0.27	0.31	0.79	49.1	75.5	94.3	100.0
HOL2-NLR	5.64	−0.01 ± 0.351	0.24	0.28	1.15	54.7	88.7	96.2	98.1
K6	119.22	−0.14 ± 0.343	0.18	0.27	1.31	56.6	88.7	94.3	98.1
Kane	119.19	−0.03 ± 0.369	0.22	0.27	1.38	54.7	84.9	94.3	98.1
Olsen	4.74	−0.10 ± 0.365	0.23	0.29	1.22	50.9	84.9	96.2	98.1
P-DGS	118.60	0.03 ± 0.342	0.25	0.27	0.96	49.1	83.0	98.1	100.0
T2	119.24	−0.06 ± 0.341	0.27	0.28	0.89	43.4	90.6	96.2	100.0
VRF	5.70	0.05 ± 0.392	0.19	0.29	1.40	60.4	77.4	96.2	98.1
Traditional formulas
Haigis	b	0.03 ± 0.372	0.20	0.29	0.83	56.1	78.9	94.7	100.0
Hoffer Q	5.75	0.11 ± 0.409	0.25	0.33	1.01	50.9	71.9	89.5	98.2
Holladay 1	1.98	−0.09 ± 0.332	0.23	0.27	1.09	56.1	91.2	96.5	98.2
SRK/T	119.25	0.01 ± 0.376	0.19	0.29	0.93	52.6	80.7	96.5	100.0

B II = Barrett Universal II; BTAL = Barrett True Axial Length; EVO = Emmetropia Verifying Optical; HOL2 = Holladay 2; HOL2-NLR = Holladay 2 with the nonlinear regression; MAE = mean absolute error; MaxAE = maximal absolute error; MedAE = median absolute error; MPE = mean prediction error; P-DGS = PEARL-DGS; PE = prediction error

^aOnly 98 eyes were measured, with 4 long eyes out of bounds of the pattern recognition grid

^bHaigis constants (a0 = 0.623, a1 = 0.323, and a2 = 0.149)