Development of the SRK/T intraocular lens implant power calculation formula
- 1 May 1990
- journal article
- Published by Ovid Technologies (Wolters Kluwer Health) in Journal of Cataract & Refractive Surgery
- Vol. 16 (3), 333-340
- https://doi.org/10.1016/s0886-3350(13)80705-5
Abstract
A new implant power calculation formula (SRK/T) was developed using the nonlinear terms of the theoretical formulas as its foundation but empirical regression methodology for optimization. Postoperative anterior chamber depth prediction, retinal thickness axial length correction, and corneal refractive index were systematically and interactively optimized using an iterative process on five data sets consisting of 1,677 posterior chamber lens cases. The new SRK/T formula performed slightly better than the Holladay, SRK II, Binkhorst, and Hoffer formulas, which was the expected result as any formula performs superiorly with the data from which it was derived. Comparative accuracy of this formula upon independent data sets is addressed in a follow-up report. The formula derived provides a primarily theoretical approach under the SRK umbrella of formulas and has the added advantage of being calculable using either SRK A-constants that have been empirically derived over the last nine years or using anterior chamber depth estimates.Keywords
This publication has 17 references indexed in Scilit:
- Empirical Modification of the Theoretical IOl Power FormulasJournal of Cataract & Refractive Surgery, 1988
- Comparison of the SRK II™ formula and other second generation formulasJournal of Cataract & Refractive Surgery, 1988
- A three-part system for refining intraocular lens power calculationsJournal of Cataract & Refractive Surgery, 1988
- A New Posterior Chamber Intraocular Lens Formula for Axial MyopesOphthalmology, 1984
- Comparison of Empirically Derived and Theoretical Aphakic Refraction FormulasAmerican Journal of Ophthalmology, 1983
- Preoperative Cataract Evaluation: Intraocular Lens Power CalculationInternational Ophthalmology Clinics, 1982
- Comparison of the accuracy of the Binkhorst, Colenbrander, and SRK™ implant power prediction formulasAmerican Intra-Ocular Implant Society Journal, 1981
- Posterior chamber implant power calculation: regression formulasAmerican Intra-Ocular Implant Society Journal, 1980
- Improvement of intraocular lens power calculation using empirical dataAmerican Intra-Ocular Implant Society Journal, 1980
- A new intraocular lens calculation formulaAmerican Intra-Ocular Implant Society Journal, 1980