Fig. 4From: The Zhu-Lu formula: a machine learning-based intraocular lens power calculation formula for highly myopic eyesPrediction errors (mean ± standard deviation) versus axial length of each formula in highly myopic eyes in the internal (a) and external (b) test datasets. BUII, Barrett Universal II; EVO, Emmetropia Verifying Optical; RBF, Radial Basis Function; D, diopterBack to article page