{"id":51378,"date":"2025-11-10T12:35:41","date_gmt":"2025-11-10T12:35:41","guid":{"rendered":"https:\/\/www.elza-institute.com\/?p=51378"},"modified":"2025-11-10T12:57:14","modified_gmt":"2025-11-10T12:57:14","slug":"new-evidence-links-keratoconus-to-changes-in-the-back-of-the-eye","status":"publish","type":"post","link":"https:\/\/www.elza-institute.com\/pt\/new-evidence-links-keratoconus-to-changes-in-the-back-of-the-eye\/","title":{"rendered":"Novas evid\u00eancias associam o ceratocone a altera\u00e7\u00f5es no fundo do olho"},"content":{"rendered":"<div data-elementor-type=\"wp-post\" data-elementor-id=\"51378\" class=\"elementor elementor-51378\" data-elementor-post-type=\"post\">\n\t\t\t\t<div class=\"elementor-element elementor-element-22cde77 e-flex e-con-boxed e-con e-parent\" data-id=\"22cde77\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-06152c7 elementor-widget elementor-widget-text-editor\" data-id=\"06152c7\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>As ectasias da c\u00f3rnea, como o ceratocone (KC), s\u00e3o tipicamente conceptualizadas como uma doen\u00e7a do segmento anterior, caracterizada pelo afinamento e irregularidade progressivos da c\u00f3rnea. A recente revis\u00e3o sistem\u00e1tica e meta-an\u00e1lise efectuada por Bayat et al. e com a coautoria do CMO da ELZA, <a href=\"https:\/\/www.elza-institute.com\/pt\/sobre\/farhad-hafezi\/\">Farhad Hafezi, MD, PhD, FARVO<\/a>, O objetivo do estudo foi determinar se ocorrem altera\u00e7\u00f5es estruturais na retina, na coroide e na cabe\u00e7a do nervo \u00f3tico em doentes com ceratocone, utilizando a tomografia de coer\u00eancia \u00f3tica (OCT) para sintetizar a evid\u00eancia dispon\u00edvel.<\/p><p>Os autores fizeram uma pesquisa sistem\u00e1tica na PubMed, EMBASE e Web of Science (at\u00e9 28 de novembro de 2024, actualizada a 1 de setembro de 2025) e identificaram 38 estudos que envolviam 4.584 olhos; 26 estudos (3.124 olhos) foram inclu\u00eddos na meta-an\u00e1lise.<\/p><p>As suas principais conclus\u00f5es foram as seguintes:<\/p><ul><li>Redu\u00e7\u00f5es significativas nas medi\u00e7\u00f5es da espessura macular: espessura macular m\u00e9dia, espessura para-foveal temporal (anel interno) e espessura perifoveal temporal e superior (anel externo).<\/li><li>Altera\u00e7\u00f5es peripapilares e da cabe\u00e7a do nervo \u00f3tico: diminui\u00e7\u00e3o da espessura da l\u00e2mina crivosa, diminui\u00e7\u00e3o da espessura m\u00e9dia da camada de fibras nervosas da retina (RNFL) e da RNFL nos quadrantes superior, temporal e inferior.<\/li><li>Por outro lado, a espessura da coroideia sub-foveal estava significativamente aumentada nos doentes com KC em compara\u00e7\u00e3o com os controlos.<\/li><li>Os par\u00e2metros da cabe\u00e7a do nervo \u00f3tico (\u00e1rea e volume da ta\u00e7a) eram maiores nos doentes com KC.<\/li><li>Curiosamente, as diferen\u00e7as entre a gravidade da doen\u00e7a foram modestas: por exemplo, os doentes com KC moderada apresentavam uma espessura da RNFL superotemporal superior \u00e0 da doen\u00e7a grave. As altera\u00e7\u00f5es do segmento posterior foram encontradas em est\u00e1dios ligeiros a avan\u00e7ados.<\/li><\/ul><p>Numa perspetiva cl\u00ednica e de investiga\u00e7\u00e3o, estes resultados desafiam a no\u00e7\u00e3o, h\u00e1 muito defendida, de que o ceratocone est\u00e1 confinado \u00e0 c\u00f3rnea. A demonstra\u00e7\u00e3o de altera\u00e7\u00f5es estruturais do segmento posterior implica que a doen\u00e7a pode envolver altera\u00e7\u00f5es mais generalizadas do tecido ocular, ou que as consequ\u00eancias biomec\u00e2nicas\/estruturais da ectasia se estendem para al\u00e9m do segmento anterior.<\/p><p>Esta meta-an\u00e1lise alarga o quadro concetual da gest\u00e3o. Embora o CXL continue a centrar-se na interrup\u00e7\u00e3o da progress\u00e3o do estroma anterior, o reconhecimento de altera\u00e7\u00f5es na retina e na coroideia pode levar \u00e0 discuss\u00e3o de uma monitoriza\u00e7\u00e3o abrangente em doentes com KC, particularmente naqueles com doen\u00e7a avan\u00e7ada ou co-morbilidades.<\/p><p>No entanto, h\u00e1 que reconhecer v\u00e1rias limita\u00e7\u00f5es: a heterogeneidade dos dispositivos e protocolos de OCT, a natureza retrospetiva e transversal de muitos dos estudos inclu\u00eddos e a incapacidade de determinar a causalidade (ou seja, se as altera\u00e7\u00f5es posteriores s\u00e3o secund\u00e1rias \u00e0 biomec\u00e2nica da c\u00f3rnea, ao alongamento axial, aos meios \u00f3pticos alterados ou se s\u00e3o totalmente independentes).<\/p><p>Em resumo, esta meta-an\u00e1lise fornece provas s\u00f3lidas de que o ceratocone envolve mais do que a forma da c\u00f3rnea e a arquitetura do estroma - pode tamb\u00e9m influenciar a espessura da retina, a estrutura da coroide e a morfologia da cabe\u00e7a do nervo \u00f3tico. Ser\u00e3o necess\u00e1rios futuros estudos longitudinais para elucidar a rela\u00e7\u00e3o temporal, o significado cl\u00ednico (por exemplo, o efeito na fun\u00e7\u00e3o visual) e as potenciais implica\u00e7\u00f5es para o rastreio, a monitoriza\u00e7\u00e3o e o tratamento do CC.<\/p><p>Para ler mais: <a href=\"https:\/\/pubmed.ncbi.nlm.nih.gov\/41197878\/\" target=\"_blank\" rel=\"noopener\">Bayat K. et al., Structural alterations in the retina and choroid of keratoconus patients detected by OCT: A systematic review and meta-analysis. Surv Ophthalmol. 2025 Nov 4:S0039-6257(25)00195-X. PMID 41197878.<\/a><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-601bd2f e-flex e-con-boxed e-con e-parent\" data-id=\"601bd2f\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t<div class=\"elementor-element elementor-element-0635bb6 e-con-full e-flex e-con e-child\" data-id=\"0635bb6\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t<div class=\"elementor-element elementor-element-ad5bd9f elementor-widget elementor-widget-image\" data-id=\"ad5bd9f\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"image.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<img decoding=\"async\" width=\"400\" height=\"120\" src=\"https:\/\/www.elza-institute.com\/wp-content\/uploads\/2025\/11\/Survey-of-Ophthalmology.png\" class=\"attachment-large size-large wp-image-51382\" alt=\"\" srcset=\"https:\/\/www.elza-institute.com\/wp-content\/uploads\/2025\/11\/Survey-of-Ophthalmology.png 400w, https:\/\/www.elza-institute.com\/wp-content\/uploads\/2025\/11\/Survey-of-Ophthalmology-300x90.png 300w, https:\/\/www.elza-institute.com\/wp-content\/uploads\/2025\/11\/Survey-of-Ophthalmology-18x5.png 18w\" sizes=\"(max-width: 400px) 100vw, 400px\" \/>\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-d427c56 e-con-full e-flex e-con e-child\" data-id=\"d427c56\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>","protected":false},"excerpt":{"rendered":"<p>O ceratocone afecta n\u00e3o s\u00f3 a c\u00f3rnea, mas tamb\u00e9m a retina, a coroide e a cabe\u00e7a do nervo \u00f3tico, tal como demonstrado numa meta-an\u00e1lise em coautoria com o Prof. Farhad Hafezi.<\/p>","protected":false},"author":4,"featured_media":51380,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[214,1,95],"tags":[1476,1484,561,1483,1163,473,123,711,1477,1480,1475,1478,972,1481,1474,1479,153,1482],"class_list":["post-51378","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-farhad-hafezi","category-general-news","category-scientific-article","tag-choroid","tag-corneal-cross-linking-implications","tag-corneal-ectasia","tag-ectatic-disease","tag-elza-institute-zurich","tag-eye-rubbing","tag-keratoconus","tag-keratoconus-screening","tag-morphological-retinal-changes","tag-ocular-biomechanics","tag-optic-nerve-head","tag-optic-nerve-morphology","tag-optical-coherence-tomography","tag-oxidative-stress-in-keratoconus","tag-posterior-segment-changes","tag-posterior-segment-imaging","tag-retina","tag-thinned-cornea"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.2 - 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