{"id":16811,"date":"2019-10-30T07:48:14","date_gmt":"2019-10-30T07:48:14","guid":{"rendered":"https:\/\/www.staging.elza-institute.com\/?p=16811"},"modified":"2020-09-26T12:45:02","modified_gmt":"2020-09-26T12:45:02","slug":"are-different-diagnostic-instruments-interchangeable-when-it-comes-measure-corneal-hoas-in-eyes-with-keratoconus","status":"publish","type":"post","link":"https:\/\/www.staging.elza-institute.com\/pt\/are-different-diagnostic-instruments-interchangeable-when-it-comes-measure-corneal-hoas-in-eyes-with-keratoconus\/","title":{"rendered":"Os diferentes instrumentos de diagn\u00f3stico s\u00e3o intercambi\u00e1veis quando se trata de medir os HOAs da c\u00f3rnea em olhos com ceratocone?"},"content":{"rendered":"<p class=\"p1\"><span class=\"s1\">Porque \u00e9 que as estrelas por vezes \"cintilam\" no c\u00e9u? Turbul\u00eancia atmosf\u00e9rica: a luz que vem da estrela \u00e9 distorcida por part\u00edculas na atmosfera. O mesmo acontece com a luz que entra no olho: passa atrav\u00e9s da c\u00f3rnea e do cristalino (a \"\u00f3tica\") e \u00e9 focada na retina (a parte neurol\u00f3gica), onde a luz \u00e9 convertida em impulsos nervosos que s\u00e3o transmitidos para o c\u00e9rebro. As imperfei\u00e7\u00f5es - particularmente na c\u00f3rnea, que \u00e9 respons\u00e1vel por 80% do poder de focagem do olho - podem ent\u00e3o distorcer a luz de muitas formas diferentes. Algumas imperfei\u00e7\u00f5es do sistema (como a miopia, a hipermetropia e o astigmatismo) s\u00e3o bastante \u00f3bvias e s\u00e3o designadas por \"aberra\u00e7\u00f5es de ordem inferior\", enquanto outras tendem a ser apenas percept\u00edveis \u00e0 noite e t\u00eam termos como \"trevo, coma e aberra\u00e7\u00e3o esf\u00e9rica\", sendo designadas por \"aberra\u00e7\u00f5es de ordem superior\" - HOAs. Quanto mais complicada for a forma em que a luz \u00e9 distorcida, mais elevada \u00e9 a ordem da aberra\u00e7\u00e3o (Figura 1).<\/span><\/p>\n<p><a href=\"https:\/\/www.staging.elza-institute.com\/wp-content\/uploads\/2019\/10\/Zernicke-pyramid-coma-trefoil.png\"><img fetchpriority=\"high\" decoding=\"async\" class=\"alignnone size-full wp-image-16812 aligncenter\" src=\"https:\/\/www.staging.elza-institute.com\/wp-content\/uploads\/2019\/10\/Zernicke-pyramid-coma-trefoil.png\" alt=\"\" width=\"565\" height=\"568\" srcset=\"https:\/\/www.staging.elza-institute.com\/wp-content\/uploads\/2019\/10\/Zernicke-pyramid-coma-trefoil.png 565w, https:\/\/www.staging.elza-institute.com\/wp-content\/uploads\/2019\/10\/Zernicke-pyramid-coma-trefoil-150x150.png 150w, https:\/\/www.staging.elza-institute.com\/wp-content\/uploads\/2019\/10\/Zernicke-pyramid-coma-trefoil-298x300.png 298w, https:\/\/www.staging.elza-institute.com\/wp-content\/uploads\/2019\/10\/Zernicke-pyramid-coma-trefoil-480x483.png 480w\" sizes=\"(max-width: 565px) 100vw, 565px\" \/><\/a><\/p>\n<p class=\"p1\" style=\"text-align: center;\"><span class=\"s1\"><i>Figura 1. Formas de aberra\u00e7\u00e3o comuns criadas quando uma \"frente de onda\" de luz passa por olhos com vis\u00e3o imperfeita. Um olho teoricamente perfeito (em cima) \u00e9 representado por um plano plano sem aberra\u00e7\u00f5es, conhecido como \"pist\u00e3o\". Cada linha mais abaixo a partir do topo representa uma aberra\u00e7\u00e3o cada vez mais de \"ordem superior\" (ou seja, mais complexa).<\/i><\/span><\/p>\n<p class=\"p1\"><span class=\"s1\">Mas quando o brilho e os halos \u00e0 volta dos candeeiros de rua e dos far\u00f3is dos carros \u00e0 noite (dois exemplos de HOA) s\u00e3o desagrad\u00e1veis para a maioria das pessoas que os experimentam, geralmente as pessoas conseguem sobreviver. No entanto, quando os olhos t\u00eam uma grande quantidade de HOA, o desempenho visual come\u00e7a a ficar seriamente comprometido - e este \u00e9 especialmente o caso em pessoas com ceratocone. Os olhos ceratoc\u00f3nicos apresentam significativamente mais HOAs do que as c\u00f3rneas \"normais\" - de tal forma que alguns investigadores defendem a utiliza\u00e7\u00e3o de avalia\u00e7\u00f5es HOA (bem como as avalia\u00e7\u00f5es habituais da forma da c\u00f3rnea feitas com top\u00f3grafos da c\u00f3rnea) para detetar as fases iniciais do ceratocone. Infelizmente, quanto mais irregular for a c\u00f3rnea, mais dif\u00edcil \u00e9 o funcionamento dos aberr\u00f3metros. <\/span><\/p>\n<p class=\"p1\"><span class=\"s1\">Muitas cl\u00ednicas t\u00eam top\u00f3grafos da c\u00f3rnea que tamb\u00e9m podem efetuar uma an\u00e1lise da aberra\u00e7\u00e3o da c\u00f3rnea, e funcionam determinando os dados de eleva\u00e7\u00e3o anterior e posterior da c\u00f3rnea (a forma da parte superior e inferior da c\u00f3rnea). Isto \u00e9 combinado com uma t\u00e9cnica chamada tra\u00e7ado de raios, e os dados resultantes s\u00e3o representados como algo chamado \"polin\u00f3mio de Zernike\" - como se pode ver na Figura 1. <\/span><\/p>\n<p class=\"p1\"><span class=\"s1\">Mas estes top\u00f3grafos adoptam abordagens diferentes para efetuar estas medi\u00e7\u00f5es - um instrumento popular utiliza \"uma c\u00e2mara Scheimpflug rotativa\" (Oculus Pentacam HR), enquanto outro instrumento popular utiliza \"tecnologia Scheimpflug dupla combinada com imagens de reflex\u00e3o baseadas no disco Placido\" (Ziemer Galilei G4). Embora se saiba que ambas as abordagens resultam em mapas de topografia da c\u00f3rnea muito semelhantes, quando se trata de avalia\u00e7\u00f5es HOA, ser\u00e1 que estes instrumentos produzem resultados equivalentes - especialmente em olhos queratoc\u00f3nicos? Essencialmente: os resultados de cada instrumento s\u00e3o intercambi\u00e1veis? \u00c9 importante conhecer esta informa\u00e7\u00e3o - se um oftalmologista com um instrumento encaminhar um doente para um especialista da c\u00f3rnea com um instrumento diferente, poder\u00e1 o especialista assumir que as novas medi\u00e7\u00f5es do doente s\u00e3o consistentes com as anteriores? <\/span><\/p>\n<p class=\"p1\"><span class=\"s1\">Um grupo de investigadores, incluindo o Prof. Farhad Hafezi e o Dr. Emilio Torres-Netto do Instituto ELZA, prop\u00f4s-se a responder a estas quest\u00f5es examinando 50 olhos de 50 pacientes com evid\u00eancias claras de ceratocone. Cada olho foi examinado na mesma consulta do paciente pelo mesmo t\u00e9cnico. <\/span><\/p>\n<p class=\"p1\"><span class=\"s1\">Os investigadores compararam os dados polinomiais de Zernike de terceira e quarta ordem que cada instrumento produziu com uma pupila de 6,0 mm, incluindo: <\/span><\/p>\n<ul class=\"ul1\">\n<li class=\"li1\"><span class=\"s1\">trif\u00f3lio a 0\u00b0,<\/span><\/li>\n<li class=\"li1\"><span class=\"s1\">trevo a 30\u00b0, <\/span><\/li>\n<li class=\"li1\"><span class=\"s1\">coma vertical,<\/span><\/li>\n<li class=\"li1\"><span class=\"s1\">coma horizontal,<\/span><\/li>\n<li class=\"li1\"><span class=\"s1\">aberra\u00e7\u00e3o esf\u00e9rica, e<\/span><\/li>\n<li class=\"li1\"><span class=\"s1\">raiz quadrada m\u00e9dia da c\u00f3rnea total (RMS), <\/span><\/li>\n<\/ul>\n<p class=\"p1\"><span class=\"s1\">Por outras palavras, escolheram seis par\u00e2metros que descrevem os HOAs que podem afetar significativamente a vis\u00e3o e compararam os valores que cada instrumento produziu para eles. A forma como os investigadores avaliaram se as duas abordagens \"concordavam\" uma com a outra foi efetuar uma an\u00e1lise dos \"Limites de concord\u00e2ncia\", que compara as diferen\u00e7as prov\u00e1veis entre os resultados individuais medidos por dois m\u00e9todos, e o coeficiente r de Pearson (uma medida da correla\u00e7\u00e3o entre duas vari\u00e1veis). Em seguida, efectuaram uma an\u00e1lise de subgrupo e analisaram estes resultados em fun\u00e7\u00e3o da inclina\u00e7\u00e3o da c\u00f3rnea (uma medida denominada Kmax, medida em dioptrias (D), em que um n\u00famero mais elevado equivale a uma c\u00f3rnea mais inclinada). Foram definidos tr\u00eas grupos: olhos com Kmax  55 D. O que \u00e9 que os investigadores descobriram?<\/span><\/p>\n<p class=\"p1\"><span class=\"s1\">Descobriram que, para a maioria dos par\u00e2metros avaliados, as correla\u00e7\u00f5es de Pearson r eram geralmente bastante baixas e os limites de concord\u00e2ncia eram amplos. Resumindo a hist\u00f3ria, houve diferen\u00e7as significativas entre as medi\u00e7\u00f5es de HOAs da c\u00f3rnea geradas pelos dispositivos Scheimpflug e Scheimpflug-Placido duplo em pacientes com ceratocone. Foram encontradas correla\u00e7\u00f5es mais fortes com diferen\u00e7as menos significativas em olhos ceratoc\u00f3nicos com valores Kmax menos acentuados - por outras palavras, quanto mais acentuada for a c\u00f3rnea (o que normalmente significa que o ceratocone est\u00e1 mais avan\u00e7ado), pior \u00e9 a concord\u00e2ncia entre os instrumentos. <\/span><\/p>\n<p class=\"p1\"><span class=\"s1\">Os investigadores conclu\u00edram que \"N\u00e3o recomendamos a utiliza\u00e7\u00e3o de medi\u00e7\u00f5es destas tecnologias de forma intercambi\u00e1vel quando se avaliam os HOAs em olhos com ceratocone\".<\/span><\/p>\n<p class=\"p1\"><span class=\"s1\"><b>Refer\u00eancia<\/b><\/span><\/p>\n<p class=\"p3\"><span class=\"s1\">Piccinini AL, Golan O, Torres-Netto EA, Hafezi F, Randleman JB. Medi\u00e7\u00f5es das aberra\u00e7\u00f5es de ordem superior da c\u00f3rnea: Compara\u00e7\u00e3o entre Scheimpflug e tecnologia dupla Scheimpflug-Placido em olhos queratoc\u00f3nicos. J Cataract Refract Surg. 2019;45(7):985-991<\/span><span class=\"s3\">.<\/span><\/p>","protected":false},"excerpt":{"rendered":"<p>Porque \u00e9 que as estrelas por vezes \"cintilam\" no c\u00e9u? Turbul\u00eancia atmosf\u00e9rica: a luz que vem da estrela \u00e9 distorcida por part\u00edculas na atmosfera. O mesmo acontece com a luz que entra no olho<\/p>","protected":false},"author":4,"featured_media":16813,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"_angie_page":false,"page_builder":"","footnotes":""},"categories":[243,214,95],"tags":[336,170,335,125,337,171],"class_list":["post-16811","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-emilio-torres","category-farhad-hafezi","category-scientific-article","tag-aberrometry","tag-astigmatism","tag-clinical-research","tag-cornea","tag-hoa","tag-irregular-astigmatism"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.7 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Are different diagnostic instruments interchangeable when it comes measure corneal HOAs in eyes with keratoconus? - The ELZA Institute<\/title>\n<meta name=\"robots\" content=\"noindex, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<meta property=\"og:locale\" content=\"pt_PT\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Are different diagnostic instruments interchangeable when it comes measure corneal HOAs in eyes with keratoconus? - The ELZA Institute\" \/>\n<meta property=\"og:description\" content=\"Why do stars sometimes \u201ctwinkle\u201d in the sky? Atmospheric turbulence: the light that comes from the star gets distorted by particles in the atmosphere. 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