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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