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The flat (K1) and steep (K2) keratometry readings were registered from the \u2018Total Corneal Refractive Power\u2019 (<jats:styled-content style=\"fixed-case\">TCRP<\/jats:styled-content>) display as well as the anterior and posterior corneal astigmatism displays (<jats:styled-content style=\"fixed-case\">ACA<\/jats:styled-content> and <jats:styled-content style=\"fixed-case\">PCA<\/jats:styled-content>, respectively). Astigmatic power vectors <jats:styled-content style=\"fixed-case\">KP<\/jats:styled-content>0 and <jats:styled-content style=\"fixed-case\">KP<\/jats:styled-content>45 were calculated and analysed for a 6\u2010mm and two 3\u2010mm zones centred on the corneal apex and the pupil, and for 8 paracentral 3\u2010mm zones.<\/jats:p><\/jats:sec><jats:sec><jats:title>Results<\/jats:title><jats:p>The astigmatism was generally higher in <jats:styled-content style=\"fixed-case\">KC<\/jats:styled-content>. Many astigmatic values in <jats:styled-content style=\"fixed-case\">KC<\/jats:styled-content> differed between the 3\u2010mm pupil\u2010centred and the 3\u2010 and 6\u2010mm apex\u2010centred zones in <jats:styled-content style=\"fixed-case\">KC<\/jats:styled-content>. In the controls, no corresponding differences between measurement zones were seen, apart from <jats:styled-content style=\"fixed-case\">PCA<\/jats:styled-content>, which differed. The magnitude and direction of <jats:styled-content style=\"fixed-case\">KP<\/jats:styled-content>0 and <jats:styled-content style=\"fixed-case\">KP<\/jats:styled-content>45 varied greatly between the paracentral measurements in <jats:styled-content style=\"fixed-case\">KC<\/jats:styled-content>.<\/jats:p><\/jats:sec><jats:sec><jats:title>Conclusion<\/jats:title><jats:p>Centration and measurement zone diameter have great impacts on the astigmatic values in <jats:styled-content style=\"fixed-case\">KC<\/jats:styled-content>. A small pupil\u2010centred measurement zone should be considered when evaluating the astigmatism in <jats:styled-content style=\"fixed-case\">KC<\/jats:styled-content>.<\/jats:p><\/jats:sec>","DOI":"10.1111\/aos.13517","type":"journal-article","created":{"date-parts":[[2017,7,10]],"date-time":"2017-07-10T13:58:57Z","timestamp":1499695137000},"page":"826-833","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":10,"title":["Measurement centration and zone diameter in anterior, posterior and total corneal astigmatism in keratoconus"],"prefix":"10.1111","volume":"95","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-8456-8036","authenticated-orcid":false,"given":"Anneli","family":"Fredriksson","sequence":"first","affiliation":[{"name":"Department of Clinical Sciences\/Ophthalmology Ume\u00e5 University Ume\u00e5 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