Gokce SE, et al. – Retrospective case series were conducted to explore the accuracy of 7 intraocular lens (IOL) calculation formulas in predicting refractive outcome in eyes with axial lengths (AL) equal to or less than 22.0 mm and to assess factors contributing to prediction errors. The Hoffer Q and Holladay 2 formulas produced slightly myopic refractive prediction errors, and the Olsen formula produced hyperopic refractive prediction errors. When the mean numerical refractive prediction error was adjusted to zero, no statistically important differences in the median absolute error were found between the 7 formulas.