{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,8,13]],"date-time":"2026-08-13T19:30:14Z","timestamp":1786649414754,"version":"build-2736575974"},"reference-count":13,"publisher":"Ovid Technologies (Wolters Kluwer Health)","issue":"9","content-domain":{"domain":["lww.com","ovid.com"],"crossmark-restriction":true},"short-container-title":[],"published-print":{"date-parts":[[2024,9]]},"abstract":"<jats:p>This case series reports eight eyes with keratoconus treated with laser implantation of one or two segments of progressive thickness corneal intrastromal ring (PT-ICRS). In this case series, it was evident that the insertion of PT-ICRS induces more pronounced corneal flattening at the thickest point, causing a reduction in distortion (coma) and lower astigmatism, resulting in a remarkable improvement in vision. Compared to the implementation of traditional intrastromal rings, the PT-ICRS variant showed superior results despite the small sample size. However, the same degree of asymmetry enhancement was not observed in cases in which a 330\u00b0 PT-ICRS was implanted, despite the improvement in visual results when replacing a 320\u00b0 traditional ring with a 330\u00b0 PT-ICRS. These conclusions are limited as this is a case series with few cases.<\/jats:p>","DOI":"10.4103\/ijo.ijo_3182_23","type":"journal-article","created":{"date-parts":[[2024,8,23]],"date-time":"2024-08-23T21:24:08Z","timestamp":1724448248000},"page":"1363-1368","update-policy":"https:\/\/doi.org\/10.1097\/lww.0000000000001000","source":"Crossref","is-referenced-by-count":1,"title":["Implantation of asymmetrical corneal intrastromal rings: A case series"],"prefix":"10.4103","volume":"72","author":[{"given":"Marina S","family":"Saito","sequence":"first","affiliation":[{"name":"Department of Ophthalmology, Hospital Oftalmol\u00f3gico Vis\u00e3o Laser, Santos, Brazil"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Ana P C","family":"Silva","sequence":"additional","affiliation":[{"name":"Department of Ophthalmology, Hospital Oftalmol\u00f3gico Vis\u00e3o Laser, Santos, Brazil"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jo\u00e3o M C","family":"Ribeiro","sequence":"additional","affiliation":[{"name":"Department of Ophthalmology, Hospital Oftalmol\u00f3gico Vis\u00e3o Laser, Santos, Brazil"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Delso","family":"Bonfante","sequence":"additional","affiliation":[{"name":"Department of Ophthalmology and Visual Sciences, Federal University of S\u00e3o Paulo (UNIFESP), S\u00e3o Paulo, Brazil"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Pablo F","family":"Rodrigues","sequence":"additional","affiliation":[{"name":"Department of Ophthalmology and Visual Sciences, Federal University of S\u00e3o Paulo (UNIFESP), S\u00e3o Paulo, Brazil"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Bernardo K","family":"Moscovici","sequence":"additional","affiliation":[{"name":"Department of Ophthalmology, Hospital Oftalmol\u00f3gico Vis\u00e3o Laser, Santos, Brazil"},{"name":"Department of Ophthalmology and Visual Sciences, Federal University of S\u00e3o Paulo (UNIFESP), S\u00e3o Paulo, Brazil"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Guilherme N C","family":"Barboza","sequence":"additional","affiliation":[{"name":"Department of Ophthalmology, Hospital Oftalmol\u00f3gico Vis\u00e3o Laser, Santos, Brazil"},{"name":"Department of Ophthalmology, School of Medical Sciences of Santos (UNILUS) \u2013 Santos, Brazil"},{"name":"Department of Ophthalmology, UNIMES School of Medicine, Santos, Brazil"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Marcello N C","family":"Barboza","sequence":"additional","affiliation":[{"name":"Department of Ophthalmology, Hospital Oftalmol\u00f3gico Vis\u00e3o Laser, Santos, Brazil"},{"name":"Department of Ophthalmology, School of Medical Sciences of Santos (UNILUS) \u2013 Santos, Brazil"},{"name":"Department of Ophthalmology, UNIMES School of Medicine, Santos, Brazil"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"276","published-online":{"date-parts":[[2024,8,23]]},"reference":[{"key":"R1-20260427","doi-asserted-by":"crossref","first-page":"829","DOI":"10.3928\/1081597X-20160822-01","article-title":"Intracorneal ring segments implantation for corneal ectasia","volume":"32","author":"Giacomin","year":"2016","journal-title":"J Refract Surg"},{"key":"R2-20260427","doi-asserted-by":"crossref","first-page":"1299","DOI":"10.1097\/ICO.0000000000001709","article-title":"Clinical outcomes after implantation of 320\u00b0-arc length intrastromal corneal ring segments in keratoconus","volume":"37","author":"Torquetti","year":"2018","journal-title":"Cornea"},{"key":"R3-20260427","doi-asserted-by":"crossref","first-page":"4415","DOI":"10.2147\/OPTH.S283387","article-title":"Asymmetric thickness of intracorneal ring segments for keratoconus","volume":"14","author":"Baptista","year":"2020","journal-title":"Clin Ophthalmology"},{"key":"R4-20260427","first-page":"e0016.","article-title":"Comparison between the results of the implantation of one long-arch segment versus two traditional arch segments in the treatment of patients with keratoconus","volume":"82","author":"Da Silva","year":"2023","journal-title":"Braz J Ophthalmol"},{"key":"R5-20260427","doi-asserted-by":"crossref","first-page":"3483","DOI":"10.1177\/11206721211000646","article-title":"Evaluation of keratoconus progression and visual improvement after implantation of intrastromal segments of the corneal ring: A retrospective study","volume":"31","author":"Moscovici","year":"2021","journal-title":"Eur J Ophthalmology"},{"key":"R6-20260427","doi-asserted-by":"crossref","first-page":"182","DOI":"10.1016\/S0886-3350(13)80404-X","article-title":"Flattening of the central corneal curvature with intrastromal corneal rings of increasing thickness: An eye bank ocular study","volume":"19","author":"Burris","year":"1993","journal-title":"J Cataract Refract Surg"},{"key":"R7-20260427","doi-asserted-by":"crossref","first-page":"e0257222.","DOI":"10.1371\/journal.pone.0257222","article-title":"Refractive changes of a novel asymmetric intracorneal ring segment with variable thickness and base width: A 2D finite element model","volume":"16","author":"Garc\u00eda de Oteyza","year":"2021","journal-title":"PLoS One"},{"key":"R8-20260427","doi-asserted-by":"crossref","first-page":"1673","DOI":"10.3390\/jcm12041673","article-title":"Asymmetric intrastromal corneal ring segments with progressive base width and thickness for keratoconus: Evaluation of efficacy and analysis of epithelial remodeling","volume":"12","author":"Benlarbi","year":"2023","journal-title":"J Clin Med"},{"key":"R9-20260427","doi-asserted-by":"crossref","first-page":"190","DOI":"10.1097\/ICO.0000000000003285","article-title":"Vision-related quality of life in patients with keratoconus with enantiomorphic topography after bilateral intrastromal corneal ring implantation","volume":"43","author":"Rodrigues","year":"2024","journal-title":"Cornea"},{"key":"R10-20260427","first-page":"40","article-title":"Therapeutic analysis in patients with keratoconus","volume":"8","author":"Carvalho","year":"2019","journal-title":"Int J Kerat Ect Cor Dis"},{"key":"R11-20260427","doi-asserted-by":"crossref","first-page":"2191","DOI":"10.1177\/11206721211001722","article-title":"Efficacy of progressive thickness intrastromal corneal ring segments in the treatment of duck phenotype keratoconus","volume":"31","author":"Arbelaez","year":"2021","journal-title":"Eur J Ophthalmol"},{"key":"R12-20260427","doi-asserted-by":"crossref","first-page":"2939","DOI":"10.4103\/ijo.IJO_2770_21","article-title":"Clinical, tomographic, and topometric outcomes of progressive thickness intracorneal ring segment implantations in duck-type keratoconus","volume":"70","author":"Coskunseven","year":"2022","journal-title":"Indian J Ophthalmol"},{"key":"R13-20260427","doi-asserted-by":"crossref","first-page":"155","DOI":"10.1097\/ICO.0000000000002160","article-title":"Clinical outcomes of an asymmetric model of intrastromal corneal ring segments for the correction of keratoconus","volume":"39","author":"Prisant","year":"2020","journal-title":"Cornea"}],"container-title":["Indian Journal of Ophthalmology"],"original-title":[],"language":"en","link":[{"URL":"https:\/\/www.ovid.com\/10.4103\/IJO.IJO_3182_23","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2026,8,13]],"date-time":"2026-08-13T18:53:51Z","timestamp":1786647231000},"score":1,"resource":{"primary":{"URL":"https:\/\/www.ovid.com\/10.4103\/IJO.IJO_3182_23"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[2024,8,23]]},"references-count":13,"journal-issue":{"issue":"9","published-print":{"date-parts":[[2024]]}},"URL":"https:\/\/doi.org\/10.4103\/ijo.ijo_3182_23","relation":{},"ISSN":["0301-4738","1998-3689"],"issn-type":[{"value":"0301-4738","type":"print"},{"value":"1998-3689","type":"electronic"}],"subject":[],"published":{"date-parts":[[2024,8,23]]},"assertion":[{"value":"2023-12-05","name":"received","label":"Received","group":{"name":"publication_history","label":"Publication History"}},{"value":"2024-05-23","name":"accepted","label":"Accepted","group":{"name":"publication_history","label":"Publication History"}}]}}