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01-12-2024 | Original Paper

Total keratometry versus standard keratometry for intraocular lens power calculation in eyes with keratoconus

Authors: Cinthya Parra-Bernal, Rocío Villaseñor-García, Erika Fernández-Muñoz, Miguel Castro-Monreal, Roberto González-Salinas

Published in: International Ophthalmology | Issue 1/2024

Abstract

Purpose

To describe the accuracy of monofocal intraocular lens power calculation in patients with keratoconus using total keratometry (TK) and standard keratometry (K) with conventional and keratoconus-modified formulas.

Setting.

Asociación Para Evitar la Ceguera en México, Mexico City, Mexico.

Design

Observational, retrospective, non-randomized, comparative study.

Methods

Biometric data from IOL Master 700 and postoperative refraction were collected from patients with keratoconus who had undergone cataract surgery. Predicted refraction of each patient was calculated using K and TK with the following formulas: SRK/T, Barrett Universal II, Panacea, Kane, Kane keratoconus, and Barrett True-K keratoconus (predicted and measured posterior corneal astigmatism [PCA]). Refractive prediction error, mean absolute error, trimmed mean, median absolute error, standard deviation, and percentage of eyes within ± 0.50 D, ± 1.00 D, ± 1.50 D, ± 2.00, and > 2.00 D were determined.

Results

55 keratoconic eyes of 40 patients were included. RPE in patients with keratoconus was < 1.00 D with all formulas. Barrett True-K keratoconus with predicted PCA registered the lowest MAE and MedAE. All formulas showed a discrete increase in myopic error percentage when calculations were performed using TK as opposed to K.

Conclusions

Barrett True-K for keratoconus showed the highest accuracy, closely followed by Kane KC. BTK KC pPCA or mPCA with standard keratometries could serve as the primary choice in eyes with keratoconus and steepness < 60 D. In the absence of keratoconus-modified formulas, TK input in conventional formulas improves the prediction outcome.

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Title: Total keratometry versus standard keratometry for intraocular lens power calculation in eyes with keratoconus
Authors: Cinthya Parra-Bernal
Rocío Villaseñor-García
Erika Fernández-Muñoz
Miguel Castro-Monreal
Roberto González-Salinas
Publication date: 01-12-2024
Publisher: Springer Netherlands
Published in: International Ophthalmology / Issue 1/2024
Print ISSN: 0165-5701
Electronic ISSN: 1573-2630
DOI: https://doi.org/10.1007/s10792-024-03332-1

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Total keratometry versus standard keratometry for intraocular lens power calculation in eyes with keratoconus

Abstract

Purpose

Design

Methods

Results

Conclusions

Other articles of this Issue 1/2024

Aphakia treatment with sutureless scleral fixation or retropupillary iris-claw intraocular lens implantation: visual acuity, anterior segment and keratometry outcomes

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Proportion and risk factors of epiretinal membrane in residents of Brussels with versus without diabetes mellitus

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Abstract

Purpose

Design

Methods

Results

Conclusions

Please log in to get access to this content

Aphakia treatment with sutureless scleral fixation or retropupillary iris-claw intraocular lens implantation: visual acuity, anterior segment and keratometry outcomes

Identification of immune-related regulatory networks and diagnostic biomarkers in thyroid eye disease

Whole-orbit-based multiparametric assessment of disease activity of thyroid eye disease on Dixon MRI

Proportion and risk factors of epiretinal membrane in residents of Brussels with versus without diabetes mellitus

Unilateral versus bilateral lateral rectus recession for correction of small to moderate angle exotropia

Long term surgical results and safety profile of the novel CM T Flex scleral fixated intraocular lens