Table 2

Prediction error and absolute error of targeted refraction using the SRK/T and the Barrett Universal II formulas

SRK/T formulaBarrett Universal II formula
Prediction
error (D)
Absolute
error (D)
Median absolute
error (D)
Prediction
error (D)
Absolute
error (D)
Median absolute
error (D)
Total0.01±0.540.39±0.370.30−0.11±0.490.36±0.340.27
95% CI−1.05 to 1.06−0.33 to 1.11−1.07 to 0.85−0.31 to 1.04
Short axial length−0.06±0.550.39±0.390.30−0.18±0.600.44±0.450.38
95% CI−1.14 to 1.03−0.37 to 1.16−1.36 to 1.00−0.44 to 1.32
Middle axial length−0.02±0.550.38±0.400.29−0.15±0.500.37±0.370.28
95% CI−1.1 to 1.06−0.4 to 1.16−1.14 to 0.83−0.36 to 1.10
Long axial length−0.13±0.540.42±0.360.32−0.11±0.460.36±0.310.29
95% CI−1.18 to 0.93−0.29 to 1.13−1.01 to 0.80−0.25 to 0.97
Eguchi Eye HospitalHokkaido−0.05±0.600.46±0.380.36−0.00±0.550.42±0.350.34
−1.22 to 1.13−0.28 to 1.21−1.08 to 1.07−0.26 to 1.11
Sato Yuya Eye ClinicMiyagi0.05±0.390.30±0.250.24−0.13±0.380.29±0.270.20
−0.71 to 0.82−0.20 to 0.80−0.86 to 0.61−0.23 to 0.82
Dokkyo Medical UniversityTochigi0.01±0.590.46±0.370.40−0.06±0.550.44±0.320.41
−1.15 to 1.17−0.26 to 1.18−1.13 to 1.01−0.20 to 1.08
Kitasato UniversityKanagawa0.15±0.470.34±0.350.25−0.04±0.360.25±0.260.17
−0.77 to 1.06−0.33 to 1.02−0.75 to 0.67−0.27 to 0.77
Juntendo University ShizuokaShizuoka0.41±0.470.44±0.440.320.27±0.390.29±0.370.17
−0.50 to 1.33−0.42 to 1.30−0.49 to 1.02−0.43 to 1.01
Chukyo Eye ClinicAichi0.02±0.560.39±0.400.31−0.13±0.50.36±0.370.27
−1.08 to 1.13−0.40 to 1.18−1.11 to 0.84−0.37 to 1.08
Kanazawa Medical UniversityIshikawa−0.03±0.590.42±0.420.34−0.03±0.610.43±0.430.36
−1.19 to 1.12−0.40 to 1.23−1.23 to 1.17−0.42 to 1.28
Tsukazaki HospitalHyogo−0.06±0.460.34±0.320.26−0.23±0.420.37±0.310.32
−0.97 to 0.85−0.29 to 0.97−1.06 to 0.60−0.24 to 0.98
Okamoto Eye ClinicEhime−0.06±0.560.43±0.370.32−0.17±0.50.38±0.370.29
−1.17 to 1.04−0.29 to 1.15−1.15 to 0.82−0.33 to 1.10
Hayashi Eye HospitalFukuoka0.01±0.610.41±0.460.27−0.18±0.450.36±0.320.26
−1.19 to 1.21−0.49 to 1.30−1.05 to 0.70−0.28 to 0.99
Miyata Eye HospitalMiyazaki−0.21±0.470.40±0.330.31−0.34±0.460.45±0.350.40
−1.14 to 0.72−0.24 to 1.04−1.24 to 0.55−0.24 to 1.14
Asato Eye ClinicOkinawa−0.06±0.430.34±0.270.29−0.19±0.400.33±0.300.27
−0.90 to 0.78−0.20 to 0.87−0.97 to 0.60−0.25 to 0.91
  • D, diopter; SRK/T, Sanders-Retzlaff-Kraff/theoretical .