[Back-calculation of the keratometer index-Which value would have been correct in cataract surgery?]

Der Ophthalmologe : Zeitschrift der Deutschen Ophthalmologischen Gesellschaft
Achim LangenbucherJohannes Weisensee

Abstract

In the clinical routine the conversion of corneal radii into corneal refractive power using a keratometer index is rarely discussed. The purpose of this study was to back-calculate the keratometer index in pseudophakic eyes based on the refractive power of the lens, biometric measurements and refraction, and to compare it to clinically established values. In this retrospective case series 99 eyes of 99 patients without pathological alterations, previous diseases, comorbidities or history of ocular surgery apart from the uneventful cataract surgery were enrolled. In all eyes a CT Asphina 409M(P) (Carl-Zeiss Meditec, Berlin, Germany) had been implanted by two surgeons (EF and PE). For calculation we used shape and power data of the intraocular lens and data from optical biometry (axial length, pseudophakic anterior chamber depth, lens thickness, corneal radius; IOLMaster 700, Carl-Zeiss Meditec, Jena, Germany). The refraction was derived manually with a trial frame (measurement distance 5 m) and autorefractometry (iProfiler, Carl-Zeiss, Jena, Germany). For this three model eyes were used: a thin lens with the nominal refractive power positioned in the equatorial plane (model A) or in the secondary principal plane of the thick len...Continue Reading

References

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Jan 27, 2004·Current Opinion in Ophthalmology·Achim LangenbucherBerthold Seitz
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Mar 11, 2019·Journal of Cataract and Refractive Surgery·David L Cooke, Timothy L Cooke
Mar 11, 2019·Journal of Cataract and Refractive Surgery·David L Cooke, Timothy L Cooke

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Citations

Feb 13, 2021·Acta Ophthalmologica·Achim LangenbucherPeter Hoffmann
Sep 18, 2021·Ophthalmic & Physiological Optics : the Journal of the British College of Ophthalmic Opticians (Optometrists)·Michael J Simpson
Nov 3, 2021·Ophthalmic & Physiological Optics : the Journal of the British College of Ophthalmic Opticians (Optometrists)·Achim LangenbucherPeter Hoffmann

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