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Graefe's Archive for Clinical and Experimental Ophthalmology

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01-07-2022 | Cataract | Cataract

Intraocular lens power calculation in patients with irregular astigmatism

Authors: Asaf Achiron, Omar Elhaddad, Duncan Leadbetter, Eliya Levinger, Oleksiy Voytsekhivskyy, Katy Smith, Venkata Avadhanam, Kieren Darcy, Derek Tole

Published in: Graefe's Archive for Clinical and Experimental Ophthalmology | Issue 12/2022

Abstract

Purpose

Accurate intraocular lens (IOL) calculation in subjects with irregular astigmatism is challenging. This study evaluated the accuracy of using Scheimpflug-derived central 2-mm equivalent keratometry reading (EKR) values for IOL calculation in irregular astigmatism.

Methods

This retrospective study included subjects (31 eyes of 30 patients) who underwent cataract surgery and IOL calculation using the 2-mm central EKR methods. We compared prediction error (PE) and absolute PE (APE) outcomes using SRK/T and Barrett Universal II formulas for keratometry data obtained from the IOLMaster 500 and Pentacam (anterior corneal sim k) devices.

Results

Cataract surgery and IOL calculation using the 2-mm central EKR methods resulted in improved visual acuity (uncorrected: from 1.13 ± 0.38 to 0.65 ± 0.46 logMar, p < 0.01; best-corrected: from 0.45 ± 0.24 to 0.26 ± 0.20 logMar, p < 0.01) after surgery. The percentage of subjects with best-corrected visual acuity of 6/6 was 22%, < 6/9 was 58%, and < 6/12 was 71%. For both the SRK/T and the Barrett formulas, the PE was similar to those obtained by IOLMaster (> 0.14) but lower than those obtained by the anterior corneal sim k (p < 0.02). IOLMaster provided keratometry reading in only 23/31 (74.1%) of cases.

Conclusions

The use of Scheimpflug central 2-mm EKR for IOL calculation in irregular astigmatism was beneficial in terms of visual acuity improvement. It had comparable refractive prediction performance to the IOLMaster 500 and better than the anterior corneal sim K. The 2-mm EKR method can be used when IOLMaster cannot provide a reliable reading in abnormal corneas.

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Title: Intraocular lens power calculation in patients with irregular astigmatism
Authors: Asaf Achiron
Omar Elhaddad
Duncan Leadbetter
Eliya Levinger
Oleksiy Voytsekhivskyy
Katy Smith
Venkata Avadhanam
Kieren Darcy
Derek Tole
Publication date: 01-07-2022
Publisher: Springer Berlin Heidelberg
Keyword: Cataract
Published in: Graefe's Archive for Clinical and Experimental Ophthalmology / Issue 12/2022
Print ISSN: 0721-832X
Electronic ISSN: 1435-702X
DOI: https://doi.org/10.1007/s00417-022-05729-z

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Springer Medicine

Intraocular lens power calculation in patients with irregular astigmatism

Abstract

Purpose

Methods

Results

Conclusions

Keynote webinar | Spotlight on medication adherence

Springer Medicine

Abstract

Purpose

Methods

Results

Conclusions

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