Accuracy of intraocular lens diopter calculation for high myopia with cataract

Objective To compare the calculation accuracy with three different intraocular lens (IOL) diopter formulas for high myopia with cataract. Methods The data of 172 eyes of 172 patients with high myopia with cataract from Feb. 2017 to Nov. 2018 in this hospital were analyzed retrospectively. All cases were divided into 3 groups according to axial length (AL). AL of group A was 26.1-28.0 mm, 28.1-30.0 mm in group B and ≥30.1 mm in group C. The intraocular lens diopter of three groups were calculated with SRK/T, Haigis and Barrett Universal II formulas, respectively. The accuracy of IOL diopter among three formulas were compared in each groups at 1 month postopeeratively. Results The difference of IOL diopter accuracy in group A were not statistically significant among three formulas (P=1.000). The IOL diopter with Barrett Universal II was the most accurate in group B and group C. Barrett Universal II was the highest (70.9%) in eyes with error ≤±0.5 D between actual diopter and expected diopter. The difference was statistically significant among three formulas (χ2=18.801, P=0.000). The difference in percentage of prediction error within ±1.0 D was not statistically significant among the three formulas (χ2=5.007, P=0.082). Conclusion The calculation accuracy of IOL diopter with Barrett Universal II formula is the highest for high myopia with cataract. Key words: Cataract, high myopia; Lens, intraocular; Accuracy, calculation, diopter