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Table 2 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 403 patients constituting the training and test sets)

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 (D) 0.68 ± 0.66 1.0 ± 0.89 0.69 ± 0.67 1.0 ± 0.93 0.77 ± 0.72
2 (D) 0.65 ± 0.64 1.0 ± 0.85 0.66 ± 0.66 1.06 ± 0.91 0.75 ± 0.72
3 (D) 0.62 ± 0.608 0.98 ± 0.81 0.65 ± 0.63 1.0 ± 0.89 0.74 ± 0.72
4 (D) 0.59 ± 0.57 0.95 ± 0.80 0.64 ± 0.61 1.03 ± 0.89 0.73 ± 0.71
5 (D) 0.52 ± 0.505 0.94 ± 0.80 0.60 ± 0.60 1.03 ± 0.89 0.73 ± 0.70
6 (D) 0.35 ± 0.39 0.93 ± 0.79 0.55 ± 0.59 1.0 ± 0.89 0.71 ± 0.70
7 (D) 0.227 ± 0.25 0.92 ± 0.80 0.50 ± 0.56 1.0 ± 0.89 0.69 ± 0.68
  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