{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2025,9,28]],"date-time":"2025-09-28T20:30:47Z","timestamp":1759091447571,"version":"3.37.3"},"reference-count":24,"publisher":"BMJ","license":[{"start":{"date-parts":[[2023,3,20]],"date-time":"2023-03-20T00:00:00Z","timestamp":1679270400000},"content-version":"unspecified","delay-in-days":0,"URL":"http:\/\/creativecommons.org\/licenses\/by-nc\/4.0\/"}],"content-domain":{"domain":["bmj.com"],"crossmark-restriction":true},"short-container-title":["Br J Ophthalmol"],"abstract":"<jats:sec><jats:title>Background\/aims<\/jats:title><jats:p>Ectasia of the cornea can occur decades after penetrating keratoplasty (PK), especially in keratoconus eyes. The purpose of this study was to characterise ectasia after PK by morphological findings in anterior segment optical coherence tomography (AS-OCT).<\/jats:p><\/jats:sec><jats:sec><jats:title>Methods<\/jats:title><jats:p>In this retrospective, single-centre case series, 50 eyes of 32 patients with a history of PK at an average of 25\u00b110 years earlier were included. The eyes were classified either as ectatic (n=35) or as non-ectatic (n=15). The main parameters included central corneal thickness (CCT), lowest corneal thickness at the interface (LCTI), anterior chamber depth, graft\u2013host interface angle at the thinnest point and host cornea\u2013iris angle. Furthermore, steep and flat keratometry readings obtained by AS-OCT (CASIA-2, Tomey) and Scheimpflug tomography (Pentacam, Oculus) were assessed. OCT findings were correlated with clinical grading of ectasia.<\/jats:p><\/jats:sec><jats:sec><jats:title>Results<\/jats:title><jats:p>There was a highly significant difference in LCTI, graft\u2013host interface angle and anterior chamber depth (in pseudophakic eyes) between the groups. The ratio calculated by the quotient of LCTI divided by CCT was significantly lower in ectatic than non-ectatic eyes (p&lt;0.001). In eyes with an LCTI\/CCT ratio of \u22640.7,\u2009the OR for the occurrence of a clinical detectable ectasia was 2.4 (CI 1.5 to 3.7). Steep keratometry values were significantly higher in ectatic eyes.<\/jats:p><\/jats:sec><jats:sec><jats:title>Conclusion<\/jats:title><jats:p>AS-OCT is a helpful tool to recognise and quantify ectasia in post-PK eyes objectively.<\/jats:p><\/jats:sec>","DOI":"10.1136\/bjo-2022-322859","type":"journal-article","created":{"date-parts":[[2023,3,20]],"date-time":"2023-03-20T17:20:25Z","timestamp":1679332825000},"page":"bjo-2022-322859","update-policy":"https:\/\/doi.org\/10.1136\/crossmarkpolicy","source":"Crossref","is-referenced-by-count":3,"title":["Characterisation of ectasia after penetrating keratoplasty in keratoconus eyes using anterior segment optical coherence tomography"],"prefix":"10.1136","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-4805-4748","authenticated-orcid":false,"given":"Julia M","family":"Weller","sequence":"first","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Lisa","family":"H\u00fcbner","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Friedrich E","family":"Kruse","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Theofilos","family":"Tourtas","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"239","published-online":{"date-parts":[[2023,3,20]]},"reference":[{"key":"2023120810200590000_bjo-2022-322859v2.1","doi-asserted-by":"crossref","first-page":"359","DOI":"10.1097\/ICO.0000000000000408","article-title":"Global consensus on keratoconus and ectatic diseases","volume":"34","author":"Gomes","year":"2015","journal-title":"Cornea"},{"key":"2023120810200590000_bjo-2022-322859v2.2","doi-asserted-by":"crossref","first-page":"602","DOI":"10.1097\/ICO.0b013e31825ec42f","article-title":"Indications, visual outcome, and ectasia in clear corneal transplants 20 years old or more","volume":"32","author":"Felipe","year":"2013","journal-title":"Cornea"},{"key":"2023120810200590000_bjo-2022-322859v2.3","doi-asserted-by":"crossref","unstructured":"Moramarco A , Gardini L , Iannetta D , et al . 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