{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,6,3]],"date-time":"2026-06-03T18:48:36Z","timestamp":1780512516177,"version":"3.54.1"},"reference-count":29,"publisher":"SAGE Publications","issue":"4","license":[{"start":{"date-parts":[[2019,3,8]],"date-time":"2019-03-08T00:00:00Z","timestamp":1552003200000},"content-version":"tdm","delay-in-days":0,"URL":"https:\/\/journals.sagepub.com\/page\/policies\/text-and-data-mining-license"}],"content-domain":{"domain":["journals.sagepub.com"],"crossmark-restriction":true},"short-container-title":["European Journal of Ophthalmology"],"published-print":{"date-parts":[[2020,7]]},"abstract":"<jats:sec>\n                    <jats:title>Purpose:<\/jats:title>\n                    <jats:p>To assess the outcomes of implanting Ferrara-type intrastromal corneal ring segments in central \u2018bow-tie\u2019-shaped keratoconus over 3\u2009years of follow-up.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Methods:<\/jats:title>\n                    <jats:p>A total of 20 eyes with central \u2018bow-tie\u2019-shaped keratoconus were evaluated before and after implanting Ferrara-type intrastromal corneal ring segments (AJL Ophthalmic, Spain). LogMAR uncorrected distance visual acuity and best corrected distance visual acuity and residual refractive errors analysed using vector analysis were recorded preoperatively, at 6\u2009months, 1\u2009year, and 3\u2009years postoperatively.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Results:<\/jats:title>\n                    <jats:p>The mean uncorrected distance visual acuity (LogMAR scale) rose from a preoperative 0.75\u2009\u00b1\u20090.28 to a 6-month postoperative 0.38\u2009\u00b1\u20090.28 (p\u2009&lt;\u20090.0001). The corrected distance visual acuity, in turn, improved from 0.07\u2009\u00b1\u20090.06 to 0.05\u2009\u00b1\u20090.06 (p\u2009=\u20090.0008). Both the uncorrected distance visual acuity and corrected distance visual acuity were stable over the postoperative period in both groups (p\u2009&gt;\u20090.05). None of the eyes lost uncorrected distance visual acuity and corrected distance visual acuity lines over the postoperative follow-up period. The spherical equivalent and the refractive cylinder declined steeply after intrastromal corneal ring segments implantation (p\u2009&lt;\u20090.0001). Both the spherical equivalent and refractive cylinder were stable over the postoperative period. None of the eyes had an increase in maximum or minimum keratometry greater than 0.75D over the postoperative period.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Conclusion:<\/jats:title>\n                    <jats:p>The planning for intrastromal corneal ring segments insertion proposed in this study reduces the spherical equivalent and refractive cylinder in this type of keratoconus, while improving post-surgery uncorrected distance visual acuity and corrected distance visual acuity. These results remain stable over 3\u2009years of follow-up. Therefore, this procedure could be considered as an effective therapeutic alternative in patients affected by this type of keratoconus.<\/jats:p>\n                  <\/jats:sec>","DOI":"10.1177\/1120672119835397","type":"journal-article","created":{"date-parts":[[2019,3,8]],"date-time":"2019-03-08T03:34:37Z","timestamp":1552016077000},"page":"643-649","update-policy":"https:\/\/doi.org\/10.1177\/sage-journals-update-policy","source":"Crossref","is-referenced-by-count":14,"title":["Three-year follow-up of intrastromal corneal ring segment implantation in central keratoconus with regular astigmatism: \u2018Bow-tie\u2019 shape"],"prefix":"10.1177","volume":"30","author":[{"given":"Luis","family":"Fern\u00e1ndez-Vega-Cueto","sequence":"first","affiliation":[{"name":"Fern\u00e1ndez-Vega Ophthalmological Institute, Oviedo, Spain"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Carlos","family":"Lisa","sequence":"additional","affiliation":[{"name":"Fern\u00e1ndez-Vega Ophthalmological Institute, Oviedo, Spain"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Aranzazu","family":"Poo-L\u00f3pez","sequence":"additional","affiliation":[{"name":"Fern\u00e1ndez-Vega Ophthalmological Institute, Oviedo, Spain"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jos\u00e9 F","family":"Alfonso","sequence":"additional","affiliation":[{"name":"Fern\u00e1ndez-Vega Ophthalmological Institute, Oviedo, Spain"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"David","family":"Madrid-Costa","sequence":"additional","affiliation":[{"name":"Faculty of Optics and Optometry, Complutense University of Madrid, Madrid, Spain"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"179","published-online":{"date-parts":[[2019,3,8]]},"reference":[{"key":"bibr1-1120672119835397","doi-asserted-by":"publisher","DOI":"10.3928\/1081597X-20160822-01"},{"key":"bibr2-1120672119835397","doi-asserted-by":"publisher","DOI":"10.1016\/j.jcrs.2015.03.010"},{"key":"bibr3-1120672119835397","doi-asserted-by":"publisher","DOI":"10.1155\/2017\/7589816"},{"key":"bibr4-1120672119835397","doi-asserted-by":"publisher","DOI":"10.1016\/j.jcrs.2009.12.031"},{"key":"bibr5-1120672119835397","doi-asserted-by":"publisher","DOI":"10.1177\/112067211002000509"},{"key":"bibr6-1120672119835397","doi-asserted-by":"publisher","DOI":"10.3928\/1081597X-20130318-06"},{"key":"bibr7-1120672119835397","doi-asserted-by":"publisher","DOI":"10.1016\/j.jcrs.2009.04.035"},{"key":"bibr8-1120672119835397","doi-asserted-by":"publisher","DOI":"10.3928\/1081597X-20080901-08"},{"key":"bibr9-1120672119835397","doi-asserted-by":"publisher","DOI":"10.1016\/j.jcrs.2008.05.028"},{"key":"bibr10-1120672119835397","doi-asserted-by":"publisher","DOI":"10.1007\/s00417-011-1759-9"},{"key":"bibr11-1120672119835397","doi-asserted-by":"publisher","DOI":"10.1016\/j.jcrs.2014.01.047"},{"key":"bibr12-1120672119835397","doi-asserted-by":"publisher","DOI":"10.1097\/ICO.0000000000000978"},{"key":"bibr13-1120672119835397","doi-asserted-by":"publisher","DOI":"10.1097\/ICO.0000000000001339"},{"key":"bibr14-1120672119835397","doi-asserted-by":"publisher","DOI":"10.1111\/j.1442-9071.2011.02698.x"},{"key":"bibr15-1120672119835397","doi-asserted-by":"publisher","DOI":"10.3928\/1081597X-20120518-02"},{"key":"bibr16-1120672119835397","doi-asserted-by":"publisher","DOI":"10.1016\/j.ajo.2014.11.020"},{"key":"bibr17-1120672119835397","first-page":"4058026","volume":"2017","author":"Fernandez-VegaCueto L","year":"2017","journal-title":"J Ophthalmol"},{"key":"bibr18-1120672119835397","doi-asserted-by":"publisher","DOI":"10.1001\/archopht.1995.01100070044023"},{"key":"bibr19-1120672119835397","doi-asserted-by":"publisher","DOI":"10.1016\/S0886-3350(98)80200-9"},{"key":"bibr20-1120672119835397","doi-asserted-by":"publisher","DOI":"10.1016\/j.jcrs.2006.02.060"},{"key":"bibr21-1120672119835397","doi-asserted-by":"publisher","DOI":"10.1016\/j.jcrs.2016.11.044"},{"key":"bibr22-1120672119835397","doi-asserted-by":"publisher","DOI":"10.1016\/S0886-3350(00)00797-5"},{"key":"bibr23-1120672119835397","doi-asserted-by":"publisher","DOI":"10.1016\/j.ajo.2012.08.020"},{"key":"bibr24-1120672119835397","doi-asserted-by":"publisher","DOI":"10.1016\/j.ajo.2006.10.041"},{"key":"bibr25-1120672119835397","doi-asserted-by":"publisher","DOI":"10.3928\/1081597X-20120509-01"},{"key":"bibr26-1120672119835397","doi-asserted-by":"publisher","DOI":"10.1016\/j.jcrs.2009.05.036"},{"key":"bibr27-1120672119835397","doi-asserted-by":"publisher","DOI":"10.3928\/1081597X-20131217-02"},{"key":"bibr28-1120672119835397","doi-asserted-by":"publisher","DOI":"10.1016\/j.jcrs.2013.03.019"},{"key":"bibr29-1120672119835397","doi-asserted-by":"publisher","DOI":"10.1016\/j.jcrs.2014.08.045"}],"container-title":["European Journal of Ophthalmology"],"original-title":[],"language":"en","link":[{"URL":"https:\/\/journals.sagepub.com\/doi\/pdf\/10.1177\/1120672119835397","content-type":"application\/pdf","content-version":"vor","intended-application":"text-mining"},{"URL":"https:\/\/journals.sagepub.com\/doi\/full-xml\/10.1177\/1120672119835397","content-type":"application\/xml","content-version":"vor","intended-application":"text-mining"},{"URL":"https:\/\/journals.sagepub.com\/doi\/pdf\/10.1177\/1120672119835397","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2026,4,28]],"date-time":"2026-04-28T19:44:27Z","timestamp":1777405467000},"score":1,"resource":{"primary":{"URL":"https:\/\/journals.sagepub.com\/doi\/10.1177\/1120672119835397"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[2019,3,8]]},"references-count":29,"journal-issue":{"issue":"4","published-print":{"date-parts":[[2020,7]]}},"alternative-id":["10.1177\/1120672119835397"],"URL":"https:\/\/doi.org\/10.1177\/1120672119835397","relation":{},"ISSN":["1120-6721","1724-6016"],"issn-type":[{"value":"1120-6721","type":"print"},{"value":"1724-6016","type":"electronic"}],"subject":[],"published":{"date-parts":[[2019,3,8]]}}}