Accuracy of modern intraocular lens power calculation formulas in refractive lens exchange for high myopia and high hyperopia.

PURPOSE: To determine the accuracy of the Holladay 2, Hoffer Q, SRK/T, and Haigis intraocular lens (IOL) power calculation formulas in high myopic and high hyperopic refractive lens exchange (RLE) with hydrophobic acrylic foldable IOLs.

SETTING: Department of Ophthalmology, Johann Wolfgang Goethe University, Frankfurt am Main, Germany.

METHODS: Preoperatively, axial length (AL) was measured by partial coherence interferometry with the IOLMaster. The RLE was performed by phacoemulsification with posterior chamber IOL implantation in the capsular bag. Optimization of the lens constants for each IOL type was done separately for eyes with a positive lens and eyes with a negative lens. Prediction error (predicted refraction - postoperative refraction) and mean absolute error were back-calculated for the Holladay 2, Hoffer Q, SRK/T, and Haigis formulas.

RESULTS: Sixty-three eyes (44 myopic, AL >or=26.0 mm; 19 hyperopic, AL <or=22.0 mm) were included. In myopic and hyperopic RLE, all 4 formulas had an overall good performance. In myopic RLE, the Haigis formula performed better.

CONCLUSION: In myopic and hyperopic RLE, optimization of lens constants improved the accuracy of IOL power calculation.