{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,9,12]],"date-time":"2026-09-12T16:44:13Z","timestamp":1789231453046,"version":"build-2803163510"},"reference-count":26,"publisher":"Public Library of Science (PLoS)","issue":"9","license":[{"start":{"date-parts":[[2023,9,8]],"date-time":"2023-09-08T00:00:00Z","timestamp":1694131200000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"content-domain":{"domain":["www.plosone.org"],"crossmark-restriction":false},"short-container-title":["PLoS ONE"],"abstract":"<jats:sec id=\"sec001\">\n<jats:title>Background<\/jats:title>\n<jats:p>Intraocular lenses are typically calculated based on a pseudophakic eye model, and for toric lenses (tIOL) a good estimate of corneal astigmatism after cataract surgery is required in addition to the equivalent corneal power. The purpose of this study was to investigate the differences between the preoperative IOLMaster (IOLM) and the preoperative and postoperative Casia2 (CASIA) tomographic measurements of corneal power in a cataractous population with tIOL implantation, and to predict total power (TP) from the IOLM and CASIA keratometric measurements.<\/jats:p>\n<\/jats:sec>\n<jats:sec id=\"sec002\">\n<jats:title>Methods<\/jats:title>\n<jats:p>The analysis was based on a dataset of 88 eyes of 88 patients from 1 clinical centre before and after tIOL implantation. All IOLM and CASIA keratometric and total corneal power measurements were converted to power vector components, and the differences between preoperative IOLM or CASIA and postoperative CASIA measurements were assessed. Feedforward neural network and multivariate linear regression prediction algorithms were implemented to predict the postoperative total corneal power (as a reference for tIOL calculation) from the preoperative IOLM and CASIA keratometric measurements.<\/jats:p>\n<\/jats:sec>\n<jats:sec id=\"sec003\">\n<jats:title>Results<\/jats:title>\n<jats:p>On average, the preoperative IOLM keratometric \/ total corneal power under- \/ overestimates the postoperative CASIA keratometric \/ real corneal power by 0.12 dpt \/ 0.21 dpt. The prediction of postoperative CASIA real power from preoperative IOLM or CASIA keratometry shows that postoperative total corneal power is systematically (0.18 dpt \/ 0.27 dpt) shifted towards astigmatism against the rule, which is not reflected by keratometry. The correlation of postoperative CASIA real power to the corresponding preoperative CASIA values is better than those as compared to the preoperative IOLM keratometry. However, there is a large variation from preoperative IOLM or CASIA keratometry to the postoperative CASIA real power of up to 1.1 dpt (95% confidence interval).<\/jats:p>\n<\/jats:sec>\n<jats:sec id=\"sec004\">\n<jats:title>Conclusion<\/jats:title>\n<jats:p>One of the challenges of tIOL calculation is the prediction of postoperative total corneal power from preoperative keratometry. Keratometric power restricted to a front surface measurement does not fully reflect the situation of corneal back surface astigmatism, which typically adds some extra against the rule astigmatism.<\/jats:p>\n<\/jats:sec>","DOI":"10.1371\/journal.pone.0288316","type":"journal-article","created":{"date-parts":[[2023,9,8]],"date-time":"2023-09-08T17:40:51Z","timestamp":1694194851000},"page":"e0288316","update-policy":"https:\/\/doi.org\/10.1371\/journal.pone.corrections_policy","source":"Crossref","is-referenced-by-count":10,"title":["Prediction of corneal power vectors after cataract surgery with toric lens implantation\u2013A vector analysis"],"prefix":"10.1371","volume":"18","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-9175-6177","authenticated-orcid":true,"given":"Achim","family":"Langenbucher","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"N\u00f3ra","family":"Szentm\u00e1ry","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Alan","family":"Cayless","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-4145-2559","authenticated-orcid":true,"given":"Jascha","family":"Wendelstein","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Peter","family":"Hoffmann","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"340","published-online":{"date-parts":[[2023,9,8]]},"reference":[{"issue":"4","key":"pone.0288316.ref001","doi-asserted-by":"crossref","first-page":"565","DOI":"10.1016\/j.jcrs.2005.12.104","article-title":"Surgically induced astigmatism after phacoemulsification in eyes with mild to moderate corneal astigmatism: temporal versus on-axis clear corneal incisions.","volume":"32","author":"E Borasio","year":"2006","journal-title":"J Cataract Refract Surg"},{"issue":"12","key":"pone.0288316.ref002","doi-asserted-by":"crossref","first-page":"1178","DOI":"10.3109\/02713683.2014.898376","article-title":"Prediction of residual astigmatism after cataract surgery using swept source fourier domain optical coherence tomography","volume":"39","author":"PC Hoffmann","year":"2014","journal-title":"Curr Eye Res"},{"key":"pone.0288316.ref003","first-page":"7395081","article-title":"The impact of changes in corneal back surface astigmatism on the residual astigmatic refractive error following routine uncomplicated phacoemulsification.","volume":"2020","author":"L Tutchenko","year":"2020","journal-title":"J Ophthalmol.22"},{"issue":"1","key":"pone.0288316.ref004","doi-asserted-by":"crossref","first-page":"156","DOI":"10.1186\/s12886-017-0550-z","article-title":"Comparison of astigmatism prediction error taken with the Pentacam measurements, Baylor nomogram, and Barrett formula for toric intraocular lens implantation.","volume":"17","author":"DY Park","year":"2017","journal-title":"BMC Ophthalmol.24"},{"key":"pone.0288316.ref005","article-title":"Comparison of two swept-source optical coherence tomography-based biometry devices.","author":"AD Fi\u0219u\u0219","year":"2020","journal-title":"J Cataract Refract Surg."},{"key":"pone.0288316.ref006","article-title":"Repeatability of two swept-source optical coherence tomography biometers and one optical low coherence reflectometry biometer.","author":"AD Fisus","year":"2021","journal-title":"J Cataract Refract Surg."},{"key":"pone.0288316.ref007","article-title":"Comparison of 2 modern swept-source optical biometers-IOLMaster 700 and Anterion","author":"A Langenbucher","year":"2022","journal-title":"Graefes Arch Clin Exp Ophthalmol"},{"issue":"5","key":"pone.0288316.ref008","first-page":"e1080","article-title":"Prediction of total corneal power from measured anterior corneal power on the IOLMaster 700 using a feedforward shallow neural network.","volume":"100","author":"A Langenbucher","year":"2021","journal-title":"Acta Ophthalmol. 2022"},{"issue":"1","key":"pone.0288316.ref009","doi-asserted-by":"crossref","first-page":"185","DOI":"10.1111\/opo.12909","article-title":"Prediction of corneal back surface power\u2014Deep learning algorithm versus multivariate regression.","volume":"42","author":"A Langenbucher","year":"2022","journal-title":"Ophthalmic Physiol Opt"},{"key":"pone.0288316.ref010","doi-asserted-by":"crossref","first-page":"3157","DOI":"10.2147\/OPTH.S284616","article-title":"Spotlight on the corneal back surface astigmatism: A Review.","volume":"15","author":"S Patel","year":"2021","journal-title":"Clin Ophthalmol."},{"issue":"1","key":"pone.0288316.ref011","doi-asserted-by":"crossref","first-page":"31","DOI":"10.1016\/S0886-3350(00)00798-7","article-title":"Astigmatism analysis by the Alpins method","volume":"27","author":"N. 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