{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,10,28]],"date-time":"2026-10-28T14:06:12Z","timestamp":1793196372021,"version":"4.5.0"},"reference-count":20,"publisher":"SAGE Publications","issue":"2","license":[{"start":{"date-parts":[[2022,12,4]],"date-time":"2022-12-04T00:00:00Z","timestamp":1670112000000},"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":[[2023,3]]},"abstract":"<jats:sec>\n                    <jats:title>Purpose<\/jats:title>\n                    <jats:p>To evaluate the clinical feasibility and visual outcomes of allograft corneal ring segment implantation for the treatment of keratoconus.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Methods<\/jats:title>\n                    <jats:p>This case series, included forty-four eyes of 32 patients with a 6-month follow-up. All cases were treated according to the Istanbul nomogram. In the Istanbul Nomogram, corneal tunnels of 4\u2009\u00d7\u20097.5\u2005mm diameters are created at depth of 200 \u03bcm and implanted with sterile allograft corneal rings (KeraNaturalTM, Lions VisionGift, Portland, OR, USA) at the cone location. Uncorrected distance visual acuity (UDVA), corrected distance visual acuity (CDVA), spherical equivalent (SE) and keratometric values were compared preoperatively versus postoperatively.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Results<\/jats:title>\n                    <jats:p>There was significant improvement in UDVA, CDVA, SE and topographic keratometric values. The mean preoperative CDVA (Snellen, decimal) increased from 0.29\u2009\u00b1\u20090.20, to 0.56\u2009\u00b1\u20090.26 (P\u2009&lt;\u20090.001), at the last visit. There was no statistically significant difference between preoperative and postoperative thinnest pachymetry values (P\u2009=\u20090.509). No major complications or adverse event were observed during and after the operation.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Conclusions<\/jats:title>\n                    <jats:p>The results of this pilot study show that sterile allograft corneal ring segments may be safe, effective and enhance the visual performance of keratoconus patients. Larger clinical studies are needed to demonstrate the effectiveness and safety with long term follow-up.<\/jats:p>\n                  <\/jats:sec>","DOI":"10.1177\/11206721221142995","type":"journal-article","created":{"date-parts":[[2022,12,4]],"date-time":"2022-12-04T22:40:58Z","timestamp":1670193658000},"page":"689-696","update-policy":"https:\/\/doi.org\/10.1177\/sage-journals-update-policy","source":"Crossref","is-referenced-by-count":39,"title":["Allograft corneal ring segment for keratoconus management: Istanbul nomogram clinical results"],"prefix":"10.1177","volume":"33","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-3634-5433","authenticated-orcid":false,"given":"Sezer","family":"Haciagaoglu","sequence":"first","affiliation":[{"name":"Faculty of Medicine, Department of Ophthalmology, Medipol University, Istanbul, Turkey"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-2445-6339","authenticated-orcid":false,"given":"Cafer","family":"Tanriverdi","sequence":"additional","affiliation":[{"name":"Faculty of Medicine, Department of Ophthalmology, Medipol University, Istanbul, Turkey"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Fatma Feyza Nur","family":"Keskin","sequence":"additional","affiliation":[{"name":"Faculty of Medicine, Department of Ophthalmology, Medipol University, Istanbul, Turkey"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Khoa D","family":"Tran","sequence":"additional","affiliation":[{"name":"Lions VisionGift, Portland, OR, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Aylin","family":"Kilic","sequence":"additional","affiliation":[{"name":"Faculty of Medicine, Department of Ophthalmology, Medipol University, Istanbul, 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