{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2025,9,12]],"date-time":"2025-09-12T19:53:07Z","timestamp":1757706787011},"reference-count":22,"publisher":"Wiley","issue":"3","license":[{"start":{"date-parts":[[2016,1,30]],"date-time":"2016-01-30T00:00:00Z","timestamp":1454112000000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/onlinelibrary.wiley.com\/termsAndConditions#vor"}],"content-domain":{"domain":["onlinelibrary.wiley.com"],"crossmark-restriction":true},"short-container-title":["Acta Ophthalmologica"],"published-print":{"date-parts":[[2016,5]]},"abstract":"<jats:title>Abstract<\/jats:title><jats:sec><jats:title>Purpose<\/jats:title><jats:p>To assess the anterior, posterior and total corneal spherical and astigmatic powers in patients undergoing refractive lens exchange (<jats:styled-content style=\"fixed-case\">RLE<\/jats:styled-content>) surgery.<\/jats:p><\/jats:sec><jats:sec><jats:title>Methods<\/jats:title><jats:p>In 402 consecutive patients planned for <jats:styled-content style=\"fixed-case\">RLE<\/jats:styled-content> at Koskelas Eye Clinic, Lule\u00e5, Sweden, right eye data from pre\u2010 and postoperative subjective refraction, preoperative <jats:styled-content style=\"fixed-case\">IOLM<\/jats:styled-content>aster<jats:sup>\u00ae<\/jats:sup> biometry and Pentacam <jats:styled-content style=\"fixed-case\">HR<\/jats:styled-content><jats:sup>\u00ae<\/jats:sup> measurements were collected. Postoperative Pentacam <jats:styled-content style=\"fixed-case\">HR<\/jats:styled-content><jats:sup>\u00ae<\/jats:sup> data were collected for 54 of the patients. The spherical and astigmatic powers of the anterior and posterior corneal surfaces and for the total cornea were assessed and compared, and surgically, induced astigmatism was calculated using vector analysis.<\/jats:p><\/jats:sec><jats:sec><jats:title>Results<\/jats:title><jats:p>The spherical power of the anterior corneal surface was 48.18\u00a0\u00b1\u00a01.69D with an astigmatic power of 0.83\u00a0\u00b1\u00a00.54D. The corresponding values for the posterior surface were \u22126.05\u00a0\u00b1\u00a02,52D and 0.26\u00a0\u00b1\u00a00.15D, respectively. The total corneal spherical power calculated with ray tracing was 42.47\u00a0\u00b1\u00a02.89D with a 0.72\u00a0\u00b1\u00a00.48D astigmatic power, and the corresponding figures obtained by estimating the posterior corneal surface were 43.25\u00a0\u00b1\u00a01.51D (p\u00a0&lt;\u00a00.001) with a 0.75\u00a0\u00b1\u00a00.49D astigmatic power (p\u00a0=\u00a00.003). In eyes with anterior astigmatism with\u2010the\u2010rule, the total corneal astigmatism is overestimated if the posterior corneal surface is estimated; in eyes, with against\u2010the\u2010rule astigmatism it is underestimated. Had the posterior corneal surface been measured in this material, 14.7% of the patients would have received a spheric instead of a toric <jats:styled-content style=\"fixed-case\">IOL<\/jats:styled-content>, or <jats:italic>vice versa<\/jats:italic>.<\/jats:p><\/jats:sec><jats:sec><jats:title>Conclusion<\/jats:title><jats:p>Estimating the posterior corneal surface in <jats:styled-content style=\"fixed-case\">RLE<\/jats:styled-content> patients leads to systematic measurement errors that can be reduced by measuring the posterior surface. Such an approach can potentially increase the refractive outcome accuracy in <jats:styled-content style=\"fixed-case\">RLE<\/jats:styled-content> surgery.<\/jats:p><\/jats:sec>","DOI":"10.1111\/aos.12965","type":"journal-article","created":{"date-parts":[[2016,1,30]],"date-time":"2016-01-30T07:54:49Z","timestamp":1454140489000},"page":"295-300","update-policy":"http:\/\/dx.doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":13,"title":["Posterior corneal astigmatism in refractive lens exchange surgery"],"prefix":"10.1111","volume":"94","author":[{"given":"Elin","family":"Rydstr\u00f6m","sequence":"first","affiliation":[{"name":"Department of Clinical Sciences\/Ophthalmology Ume\u00e5 University Hospital Ume\u00e5 Sweden"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Oscar","family":"Westin","sequence":"additional","affiliation":[{"name":"Department of Clinical Sciences\/Ophthalmology Ume\u00e5 University Hospital Ume\u00e5 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