{"id":1574,"date":"2024-10-10T14:21:24","date_gmt":"2024-10-10T14:21:24","guid":{"rendered":"http:\/\/staging.livision-optika.com\/edukativni-centar\/roznica-cornea\/"},"modified":"2024-11-12T08:18:49","modified_gmt":"2024-11-12T08:18:49","slug":"roznica-cornea","status":"publish","type":"post","link":"https:\/\/livision-optika.com\/edukativni-centar\/roznica-cornea\/","title":{"rendered":"Ro\u017enica (cornea)"},"content":{"rendered":"<p><span style=\"font-weight: bold;\">Ro\u017enica (<span style=\"font-style: italic;\">lat. cornea<\/span>) prednji je prozirni dio vanjske o\u010dne ovojnice te je tako\u0111er prvi opti\u010dki medij na koji dolaze zrake svijetlosti na putu kroz oko.<\/span> <\/p>\n<p>Njena uloga je lom svjetlosti, tj. refrakcija oka. Prozirna je kao staklo zbog odre\u0111ene koli\u010dine vode u sebi, nema krvnih \u017eila, a \u017eiv\u010dana vlakna nemaju mijelinsku ovojnicu. <br \/>Hranjive tvari dobiva iz suza sa vanjske strane i o\u010dne vodice sa unutarnje strane. Ro\u017enica na rubu prelazi u bjeloo\u010dnicu. Prednja povr\u0161ina ro\u017enice grani\u0107i s vanjskim prostorom te je konveksna, a stra\u017enja povr\u0161ina ro\u017enice je konkavna.Time zapravo dobivamo opti\u010dku le\u0107u jakosti cca 43 dioptrije. Pravilna ispup\u010denost je bitno obilje\u017eje ro\u017enice. Ako je zakrivljenost ro\u017enice u dva me\u0111usobno okomita meridijana nejednaka, javlja se astigmatizam jer se zrake ne mogu sastati u jednoj to\u010dki. Radijus zakrivljenosti ro\u017enice iznosi 7.8 mm. U \u010dovjeka, ro\u017enica ima promjer oko 11.5 mm. Ukoliko je promjer manji od 10 mm, govorimo o maloj ro\u017enici (<span style=\"font-style: italic;\">mikrocornea<\/span>), ukoliko je ve\u0107i od 13 mm, tada govorimo o velikoj ro\u017enici (<span style=\"font-style: italic;\">megalocornea<\/span>).<\/p>\n<p>Debljina ro\u017enice je ra\u017eli\u010dita, na krajevima iznosi oko 1,0 mm, a u centru je tanja i iznosi oko 0,7mm. Degenerativno oboljenje ro\u017enice kod koje dolazi do stanjenja ro\u017enice na jednom mjestu te njenog izbo\u010denja naziva se keratokonus. Sli\u010dno keratokonusu je karatoglobus, a razlika je u tome da kod keratoglobusa je cijela ro\u017enica izbo\u010dena, a ne samo jedanj njen dio. Debljina ro\u017enice va\u017ean je kriterij u kandidata za lasersko skidanje dioptrije (LASIK) jer se operativni zahvat radi na ro\u017enici.<\/p>\n<p><span style=\"font-weight: bold;\">Idu\u0107i od prednje prema stra\u017enjoj povr\u0161ini, unutar ro\u017enice razlikujemo 5 slojeva:<\/span><\/p>\n<ul>\n<li>Vi\u0161eslojni plo\u010dasti epitel <\/li>\n<li>Bowmanova bazalna membrana<\/li>\n<li>Supstantia propria &#8211; stroma<\/li>\n<li>Descemetova membrana <\/li>\n<li>Endotel, jednoslojni plo\u010dasti<\/li>\n<\/ul>\n<h4>Bolesti ro\u017enice:<\/h4>\n<p>Upala ro\u017enice (keratitis) &#8211; razlikujemo infektivni i neinfektivne uzroke keratitisa.<\/p>\n<p><span style=\"font-weight: bold;\">Infektivni keratitis dijelimo na:<\/span><\/p>\n<ul>\n<li>Bakterijski keratitis<\/li>\n<li>Virusni keratitis<\/li>\n<li>Gljivi\u010dni keratitis<\/li>\n<\/ul>\n<p>Neinfektivni keratitis nazivamo keratopatijama. Uzrok je cijeli niz faktora koji oslabljuju ro\u017enicu i pridonose njeno oboljenje.<\/p>\n<p>Autor:<br \/>Bc. Livio Svr\u017enjak, optometrist<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Ro\u017enica (lat. cornea) prednji je prozirni dio vanjske o\u010dne ovojnice te je tako\u0111er prvi opti\u010dki medij na koji dolaze zrake svijetlosti na putu kroz oko. Njena uloga je lom svjetlosti, tj. refrakcija oka. Prozirna je kao staklo zbog odre\u0111ene koli\u010dine vode u sebi, nema krvnih \u017eila, a \u017eiv\u010dana vlakna nemaju mijelinsku ovojnicu. Hranjive tvari dobiva [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":2669,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"_et_pb_use_builder":"","_et_pb_old_content":"","_et_gb_content_width":"","footnotes":""},"categories":[18],"tags":[],"class_list":["post-1574","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-anatomija-oka"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v23.6 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Ro\u017enica (cornea)<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/livision-optika.com\/edukativni-centar\/roznica-cornea\/\" \/>\n<meta property=\"og:locale\" content=\"hr_HR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Ro\u017enica (cornea)\" \/>\n<meta property=\"og:description\" content=\"Ro\u017enica (lat. cornea) prednji je prozirni dio vanjske o\u010dne ovojnice te je tako\u0111er prvi opti\u010dki medij na koji dolaze zrake svijetlosti na putu kroz oko. Njena uloga je lom svjetlosti, tj. refrakcija oka. Prozirna je kao staklo zbog odre\u0111ene koli\u010dine vode u sebi, nema krvnih \u017eila, a \u017eiv\u010dana vlakna nemaju mijelinsku ovojnicu. 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