{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,2,19]],"date-time":"2026-02-19T22:33:19Z","timestamp":1771540399895,"version":"3.50.1"},"reference-count":50,"publisher":"Springer Science and Business Media LLC","issue":"6","license":[{"start":{"date-parts":[[2011,9,21]],"date-time":"2011-09-21T00:00:00Z","timestamp":1316563200000},"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":["Ophthalmic Physiologic Optic"],"published-print":{"date-parts":[[2011,11]]},"abstract":"<jats:sec>\n                    <jats:label\/>\n                    <jats:p>\n                      <jats:bold>Citation information:<\/jats:bold>\n                      Jinabhai A, Radhakrishnan H &amp; O\u2019Donnell C. Repeatability of ocular aberration measurements in patients with keratoconus.\n                      <jats:italic>Ophthalmic Physiol Opt<\/jats:italic>\n                      2011,\n                      <jats:bold>31<\/jats:bold>\n                      , 588\u2013594. doi: 10.1111\/j.1475\u20101313.2011.00868.x\n                    <\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Abstract<\/jats:title>\n                    <jats:p>\n                      <jats:bold>Purpose:\u2002<\/jats:bold>\n                      To explore the repeatability of lower\u2010order and higher\u2010order ocular aberrations measured in patients with keratoconus.\n                    <\/jats:p>\n                    <jats:p>\n                      <jats:bold>Methods:\u2002<\/jats:bold>\n                      The IRX\u20103 (Imagine Eyes, Paris, France) aberrometer was used to record lower\u2010order and higher\u2010order aberrations in 31 eyes of 31 patients with keratoconus. Four monocular measurements were taken consecutively for each patient. The aberrometry data were analysed up to the 5th Zernike order for a 4\u2010mm pupil diameter. The data were evaluated using repeated\u2010measures\n                      <jats:sc>anova<\/jats:sc>\n                      and Friedman analyses. Repeatability was analysed using within\u2010subject standard deviation (S\n                      <jats:sub>W<\/jats:sub>\n                      ) and the repeatability limit (\n                      <jats:italic>r<\/jats:italic>\n                      ) calculated as 1.96 \u00d7\u221a2\u2003\u00d7\u2003S\n                      <jats:sub>w<\/jats:sub>\n                      .\n                    <\/jats:p>\n                    <jats:p>\n                      <jats:bold>Results:\u2002<\/jats:bold>\n                      Of the 11 aberration terms evaluated, the repeatability of\n                      <jats:italic>Z<\/jats:italic>\n                      (2,0) (mean\u2003= 1.36\u2003\u03bcm; S\n                      <jats:sub>W<\/jats:sub>\n                      \u2003=\u20030.09\u2003\u03bcm;\n                      <jats:italic>r\u2003<\/jats:italic>\n                      =\n                      <jats:italic>\u2003<\/jats:italic>\n                      0.26\u2003\u03bcm);\n                      <jats:italic>Z<\/jats:italic>\n                      (2,\u00b12) RMS (mean\u2003=\u20031.05\u2003\u03bcm; S\n                      <jats:sub>W<\/jats:sub>\n                      \u2003= 0.09\u2003\u03bcm;\n                      <jats:italic>r\u2003<\/jats:italic>\n                      =\n                      <jats:italic>\u2003<\/jats:italic>\n                      0.24\u2003\u03bcm) and\n                      <jats:italic>Z<\/jats:italic>\n                      (4,0) aberrations (mean\u2003=\u20030.34\u2003\u03bcm; S\n                      <jats:sub>W<\/jats:sub>\n                      \u2003=\u20030.09 \u03bcm;\n                      <jats:italic>r\u2003<\/jats:italic>\n                      =\n                      <jats:italic>\u2003<\/jats:italic>\n                      0.24\u2003\u03bcm) showed the highest variability. In contrast,\n                      <jats:italic>Z<\/jats:italic>\n                      (3,\u00b11) RMS aberrations (mean\u2003=\u20030.85\u2003\u03bcm; S\n                      <jats:sub>W<\/jats:sub>\n                      \u2003=\u20030.06\u2003\u03bcm;\n                      <jats:italic>r\u2003<\/jats:italic>\n                      =\n                      <jats:italic>\u2003<\/jats:italic>\n                      0.16\u2003\u03bcm) and\n                      <jats:italic>Z<\/jats:italic>\n                      (4,\u00b12) RMS aberrations (mean\u2003=\u20030.40\u2003\u03bcm; S\n                      <jats:sub>W<\/jats:sub>\n                      \u2003=\u20030.07\u2003\u03bcm;\n                      <jats:italic>r\u2003<\/jats:italic>\n                      =\n                      <jats:italic>\u2003<\/jats:italic>\n                      0.18\u2003\u03bcm) showed comparatively better repeatability.\n                    <\/jats:p>\n                    <jats:p>\n                      <jats:bold>Conclusions:\u2002<\/jats:bold>\n                      The lower\u2010order and higher\u2010order aberrations measured in this group of keratoconic patients showed higher levels of variability compared to previous investigations of visually\u2010normal subjects. These results may be of interest to eyecare practitioners involved in the design and fitting of aberration\u2010controlling contact lenses for patients with keratoconus.\n                    <\/jats:p>\n                  <\/jats:sec>","DOI":"10.1111\/j.1475-1313.2011.00868.x","type":"journal-article","created":{"date-parts":[[2011,9,21]],"date-time":"2011-09-21T13:23:03Z","timestamp":1316611383000},"page":"588-594","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":30,"title":["Repeatability of ocular aberration measurements in patients with 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