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Graefe's Archive for Clinical and Experimental Ophthalmology

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01.02.2020 | Cataract

Comparing refractive outcomes of a standard industry toric IOL calculator using anterior corneal astigmatism and total corneal refractive power

verfasst von: C. Kern, L. El Kaissi, K. Kortuem, M. Shajari, E. Vounotrypidis, A. Langenbucher, S. Priglinger, W. J. Mayer

Erschienen in: Graefe's Archive for Clinical and Experimental Ophthalmology | Ausgabe 2/2020

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Abstract

Purpose

To evaluate refractive outcomes for a standard industry calculator using anterior corneal astigmatism or total corneal refractive power.

Methods

This prospective interventional study evaluated the refractive outcomes of 56 eyes using a standard industry calculator (Zeiss ZCalc) and a digital IOL alignment software. After A-constant optimisation the ZCalc was recalculated with two different keratometry values using appropriate refractive indices: anterior corneal astigmatism (ACA) by IOLMaster 700 and total corneal refractive power (TCRP) by Pentacam. The Barrett toric calculator was used as a reference.

Results

Undercorrection of 0.04 ± 0.42 D after 1 week and 0.13 ± 0.48 D after 3 months was achieved for the spherical equivalent by using a standard industry calculator. IOL misalignment was 2.8° ± 3.4° using a digital alignment system. For the ZCalc, the mean absolute error could be reduced from 0.19 ± 0.40 D using ACA to 0.04 ± 0.48 D when considering total corneal refractive power (p = 0.06). The Barrett calculator delivered better refractive outcomes than using a standard industry calculator with ACA measurements only (− 0.06 ± 0.43 D; p < 0.01).

Conclusion

Reliable and accurate refractive outcomes in toric IOL calculation were achieved by using the ZCalc calculator. The prediction error for a widely used standard industry toric IOL calculator could be reduced by using measured total corneal refractive power.

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Titel: Comparing refractive outcomes of a standard industry toric IOL calculator using anterior corneal astigmatism and total corneal refractive power
verfasst von: C. Kern
L. El Kaissi
K. Kortuem
M. Shajari
E. Vounotrypidis
A. Langenbucher
S. Priglinger
W. J. Mayer
Publikationsdatum: 01.02.2020
Verlag: Springer Berlin Heidelberg
Erschienen in: Graefe's Archive for Clinical and Experimental Ophthalmology / Ausgabe 2/2020
Print ISSN: 0721-832X
Elektronische ISSN: 1435-702X
DOI: https://doi.org/10.1007/s00417-019-04570-1

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Springer Medizin

Comparing refractive outcomes of a standard industry toric IOL calculator using anterior corneal astigmatism and total corneal refractive power

Abstract

Purpose

Methods

Results

Conclusion

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Operative Therapie und Keimnachweis bei endogener Endophthalmitis

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Springer Medizin

Abstract

Purpose

Methods

Results

Conclusion

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