A comparison of SRK/T formula with Hill RBF 2 and Barrett Universal II in the calculation of intraocular lens power
Objective: To compare the accuracy of SRK/T, Barrett Universal II and Hill radial basis activation function-2 formulas in intraocular lens power calculation using different axial lengths.
Methods: The retrospective study was conducted at the Lahore General Hospital, Lahore, Pakistan, and comprised data from June to December 2020 of patients who underwent phacoemulsification with non-toric, monofocal intraocular lens implantation. Data was sorted in 3 groups on the basis of axial length; group 1 22-25mm, group 2(>25mm, and group 3 <22mm). Intraocular lens power was calculated using SRK/T with IOL Master, while online calculators were used for Barrett Universal II and Hill radial basis activation function-2 formulas. Data was analysed using SPSS 21.
Results: Of the 100 patients, 47(347%) were males and 53(53%) were females. There were 49(49%) diabetics, and 57(57%) were right eyes. There were 77(77%) patients with mean age 62.38+9.5 in group 1, 17(17%) patients with mean age 52.59+12.78 in group 2, and 6(6%) patients with mean age 61.33+7.61 years in group 3. Mean axial length in group 1 was 23.55+0.81mm with anterior chamber depth of 3.1+ 0.37mm. In group 2, mean axial length was 27.54+2.8mm, with anterior chamber depth of 3.4+0.15mm. In group 3, mean axial length was 21.74mm, with anterior chamber depth of 3.14+0.44mm. Mean prediction error of SRK/T versus Barrett Universal II was 0.092+0.041D (p=0.078), SRK/T versus Hill radial basis activation function-2 was 0.066+0.037D (p=0.221) and Barrett Universal versus Hill radial basis activation function-2 was -0.025+0.019D (p=0.553).