{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,8,27]],"date-time":"2026-08-27T15:23:00Z","timestamp":1787844180243,"version":"build-2784847793"},"reference-count":37,"publisher":"Ovid Technologies (Wolters Kluwer Health)","issue":"5","content-domain":{"domain":["lww.com","ovid.com"],"crossmark-restriction":true},"short-container-title":[],"published-print":{"date-parts":[[2021,5]]},"abstract":"\n Purpose:<\/jats:title>\n The aim of this study was to determine the effect of routine uncomplicated phacoemulsification on the orthogonal distribution of mass within the central optical zone of the cornea.<\/jats:p>\n <\/jats:sec>\n \n Methods:<\/jats:title>\n Astigmatism at both corneal surfaces was evaluated using Orbscan II (Bausch &and Lomb) before and up to 3 months after routine phacoemulsification (one eye\/patient). The data were subjected to vector analysis to estimate the pre-and postoperative total astigmatism of the cornea (TCA).<\/jats:p>\n <\/jats:sec>\n \n Results:<\/jats:title>\n \n Reporting the chief findings in minus cylinder (diopters, DC) over the central 3 mm (A) and 5 mm (B) optical zones. Mean TCA powers (\u00b1sd) at pre- and 3-months postop were A) \u20134.45DC (\u00b12.00) and \u20135.69DC (\u00b12.69), B) \u20132.91DC (\u00b12.22) and \u20132.71DC (\u00b11.60). Change in mean power was significant over 3 mm (\n P<\/jats:italic>\n < 0.01,\n n<\/jats:italic>\n = 49) but not over 5 mm. Inter-zonal differences were significant (\n P<\/jats:italic>\n < 0.01). There was a significant linear relationship between the change in TCA power (\n y<\/jats:italic>\n = preoperative-postoperative) and TCA at preoperative stage (x) where, A)\n y<\/jats:italic>\n = 0.45x + 3.12 (\n r<\/jats:italic>\n = 0.336,\n n<\/jats:italic>\n = 49,\n P<\/jats:italic>\n = 0.018), B)\n y<\/jats:italic>\n = x + 2.65 (\n r<\/jats:italic>\n = 0.753,\n n<\/jats:italic>\n = 49,\n P<\/jats:italic>\n = <0.01). Over the central 3 mm zone only, change (preoperative-postoperative) in axis (\u00b0) of TCA (y\n 1<\/jats:sub>\n ) was significantly associated with TCA axis at preoperative stage (x\n 1<\/jats:sub>\n ) where y\n 1<\/jats:sub>\n = 1.391x\n 1<\/jats:sub>\n -0.008x\n 1<\/jats:sub>\n 2-0.701 (\n r<\/jats:italic>\n = 0.635,\n n<\/jats:italic>\n = 49,\n P<\/jats:italic>\n < 0.01).\n <\/jats:p>\n <\/jats:sec>\n \n Conclusion:<\/jats:title>\n \n Changes in TCA power and axis at 3 months postop, determined using Orbscan II, are indicative of orthogonal alterations in the distribution of corneal tissue. Over the central 3 mm zone, the association between y\n 1<\/jats:sub>\n and x\n 1<\/jats:sub>\n shows that a change in TCA axis is more profound when preoperative axis is near 90\u00b0 i.e., against-the-rule.\n <\/jats:p>\n <\/jats:sec>","DOI":"10.4103\/ijo.ijo_1168_20","type":"journal-article","created":{"date-parts":[[2021,5,2]],"date-time":"2021-05-02T11:32:28Z","timestamp":1619955148000},"page":"1073-1079","update-policy":"https:\/\/doi.org\/10.1097\/lww.0000000000001000","source":"Crossref","is-referenced-by-count":1,"title":["The influence of routine uncomplicated phacoemulsification on the orthogonality of the cornea"],"prefix":"10.4103","volume":"69","author":[{"given":"Larysa","family":"Tutchenko","sequence":"first","affiliation":[{"name":"Department of Ophthalmology, Shupyk National Medical Academy of Postgraduate Education, Kyiv, Ukraine"},{"name":"Kyiv City Clinical Ophthalmological Hospital \u201cEye Microsurgical Center\u201d, Kyiv, Ukraine"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Sudi","family":"Patel","sequence":"additional","affiliation":[{"name":"NHS National Services Scotland, Edinburgh, United Kingdom"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Oleksiy","family":"Voytsekhivskyy","sequence":"additional","affiliation":[{"name":"Kyiv City Clinical Ophthalmological Hospital \u201cEye Microsurgical Center\u201d, Kyiv, Ukraine"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Mykhailo","family":"Skovron","sequence":"additional","affiliation":[{"name":"Kyiv City Clinical Ophthalmological Hospital \u201cEye Microsurgical Center\u201d, Kyiv, Ukraine"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Olha","family":"Horak","sequence":"additional","affiliation":[{"name":"Kyiv City Clinical Ophthalmological Hospital \u201cEye Microsurgical Center\u201d, Kyiv, 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