TABLE.

Absolute Prediction Error by Intraocular Lens Calculation Formula using Manufacturer Constants

	Absolute Predictor Error (Diopters)
Formula (n=42)	Mean ± SD	Median (*)
Haigis (n=33)	3.5 ± 2.2	3.5 (1.4, 5.1)
Hoffer Q	2.6 ± 2.0	2.1 (0.7, 4.0)
Holladay 1	1.7 ± 1.3	1.2 (0.7, 2.5)
Holladay 2	1.9 ± 1.5	1.4 (0.6, 2.9)
Olsen (n=33)	2.2 ± 1.7	1.6 (0.9, 3.3)
SRK/T	1.4 ± 1.1	1.3 (0.3, 2.1)
SRK II	2.4 ± 1.8	2.2 (0.9, 3.6)
T2	1.3 ± 1.0	1.1 (0.5, 2.0)
Universal	3.0 ± 2.2	2.8 (1.1, 4.7

SD=Standard Deviation; SRK/t=Sanders-Retzlaff-Kraff Theoretic; SRK II=Sanders-Retzlaff-Kraff II.

^*(1st Quartile, 3rd Quartile)