Comparison of Hill-radial basis function, Barrett Universal and current third generation formulas for the calculation of intraocular lens power during cataract surgery

Author(s): Timothy V Roberts ¹ ^, ² , Chris Hodge ¹ ^, ³ , Gerard Sutton ¹ ^, ² ^, ⁴ , Michael Lawless ¹ ^, ² , contributors to the Vision Eye Institute IOL outcomes registry

Publication date (Electronic): August 31 2017

Journal: Clinical & Experimental Ophthalmology

Publisher: Wiley

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Abstract

This study represents a novel comparison of recently introduced intraocular lens power calculation formulas.

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Most cited references 31

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Comparison of immersion ultrasound biometry and partial coherence interferometry for intraocular lens calculation according to Haigis.

W Haigis, B. Schneider, B Lege … (2000)

The precision of intraocular lens (IOL) calculation is essentially determined by the accuracy of the measurement of axial length. In addition to classical ultrasound biometry, partial coherence interferometry serves as a new optical method for axial length determination. A functional prototype from Carl Zeiss Jena implementing this principle was compared with immersion ultrasound biometry in our laboratory. In 108 patients attending the biometry laboratory for planning of cataract surgery, axial lengths were additionally measured optically. Whereas surgical decisions were based on ultrasound data, we used postoperative refraction measurements to calculate retrospectively what results would have been obtained if optical axial length data had been used for IOL calculation. For the translation of optical to geometrical lengths, five different conversion formulas were used, among them the relation which is built into the Zeiss IOL-Master. IOL calculation was carried out according to Haigis with and without optimization of constants. On the basis of ultrasound immersion data from our Grieshaber Biometric System (GBS), postoperative refraction after implantation of a Rayner IOL type 755 U was predicted correctly within +/- 1 D in 85.7% and within +/- 2 D in 99% of all cases. An analogous result was achieved with optical axial length data after suitable transformation of optical path lengths into geometrical distances. Partial coherence interferometry is a noncontact, user- and patient-friendly method for axial length determination and IOL planning with an accuracy comparable to that of high-precision immersion ultrasound.

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Comparison of 9 intraocular lens power calculation formulas.

David L Cooke, Timothy Cooke (2016)

To evaluate the accuracy of 9 intraocular lens (IOL) calculation formulas using 2 optical biometers.

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Optimizing intraocular lens power calculations in eyes with axial lengths above 25.0 mm.

Li WANG, Mariko Shirayama, Xingxuan Jack Ma … (2011)

To evaluate the accuracy of refractive prediction of 4 intraocular lens (IOL) power calculation formulas in eyes with axial length (AL) greater than 25.0 mm and to propose a method of optimizing AL to improve the accuracy. Cullen Eye Institute, Baylor College of Medicine, Houston, Texas, USA, and Department of Ophthalmology, Goethe University, Frankfurt am Main, Germany. Case series. Refractive prediction errors with the Holladay 1, Haigis, SRK/T, and Hoffer Q formulas were evaluated in consecutive cases. Eyes were randomized to a group used to develop the method of optimizing AL by back-calculation or a group used for validation. Further validation was performed in 2 additional data sets. The optimized AL values were highly correlated with the IOLMaster AL (R(2) from 0.960 to 0.976). In the validating group, the method of optimizing AL significantly reduced the mean numerical errors for IOLs greater than 5.00 diopters (D) from +0.27 to +0.68 D to -0.10 to -0.02 D and for IOLs of 5.00 D or less from +1.13 to +1.87 D to -0.21 to +0.01 D, respectively (all P<.05). In 2 additional validation data sets, this method significantly reduced the percentage of eyes that would be left hyperopic. The proposed method of optimizing AL significantly reduced the percentage of long eyes with a hyperopic outcome. Updated optimizing AL formulas by combining all eyes from the 2 study centers are proposed. No author has a financial or proprietary interest in any material or method mentioned. Copyright © 2011 ASCRS and ESCRS. Published by Elsevier Inc. All rights reserved.