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Table 2 Means, SDs, MedAEs of prediction errors, and proportions of errors within ± 0.25 D, ± 0.50 D, ± 1.00 D, and greater than + 0.50 D in the use of 5 kinds of power calculations (N = 395 eyes)

From: Machine learning adaptation of intraocular lens power calculation for a patient group

Power calculation method SRK/T Haigis BUII Hill-RBF Adapted
Mean (SD), D 0.02 (0.45)  − 0.03 (0.44) 0.25 (0.40) 0.12 (0.40) 0.01 (0.38)
MedAE, D 0.27 0.27 0.31 0.27 0.21
Within ± 0.25 D 46.1% 47.1% 41.0%x 46.6% 54.4%*
Within ± 0.50 D 75.2% 78.2% 70.9%x 79.5% 83.5%*
Within ± 1.00 D 96.2% 96.7% 96.2% 97.5% 98.5%
Greater than + 0.50 D 24.8% 21.8% 29.1% 20.5% 16.5%*
  1. BUII Barrett Universal II; SD standard deviation; D diopter; MedAE median absolute error
  2. Adapted denotes SRK/T formula adapted with support vector regressor
  3. * and x: significantly larger or smaller than the mean levels, respectively (residual analysis)