Accuracy of modern intraocular lens power calculation formulas in refractive lens exchange for high myopia and high hyperopia
Received 17 September 2008; received in revised form 24 February 2009; accepted 24 February 2009.
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 ≥26.0 mm; 19 hyperopic, AL ≤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.
From the Department of Ophthalmology (Terzi, Kohnen), Goethe University, Frankfurt am Main, Germany, and Cullen Eye Institute (Wang, Kohnen), Baylor College of Medicine, Houston, Texas, USA
Corresponding author: Thomas Kohnen, MD, Professor of Ophthalmology, Goethe University, Department of Ophthalmology, Theodor-Stern-Kai 7, 60590 Frankfurt am Main, Germany.
No author has a financial or proprietary interest in any material or method mentioned.
ABSTRACT