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Table 3 Mean values of the error δSKM (and standard deviation) between real and predicted data KM for different combinations of parameters and different polynomial degrees (for the test set)

From: Improving accuracy of corneal power measurement with partial coherence interferometry after corneal refractive surgery using a multivariate polynomial approach

Parameters: degree (n)

AL, K1, K2, ACD

AL, ACD

AL, K1, K2

AL

K1, K2

1

0.71 ± 0.53

1.01 ± 0.84

0.71 ± 0.52

1.02 ± 0.87

0.78 ± 0.66

2

0.16 ± 0.19

0.86 ± 0.14

0.31 ± 0.24

1.06 ± 0.48

0.28 ± 0.38

3

0.73 ± 0.61

1.06 ± 0.92

0.74 ± 0.56

1.04 ± 0.93

0.78 ± 0.66

4

0.83 ± 0.33

1.26 ± 1.04

0.93 ± 0.33

1.23 ± 1.01

0.99 ± 1.25

5

0.70 ± 0.55

1.46 ± 1.42

1.04 ± 0.53

1.21 ± 1.03

1.28 ± 1.34

6

1.02 ± 0.41

1.77 ± 0.95

1.03 ± 0.46

1.43 ± 0.99

1.44 ± 1.20

7

1.23 ± 0.78

1.99 ± 1.23

1.24 ± 0.66

1.42 ± 1.43

1.36 ± 1.34

  1. AL axial length, K1 flatter keratometry value, K2 steeper keratometry value, KM mean keratometry value, ACD anterior chamber depth measured from the corneal endothelium to the anterior surface of the lens