{"id":1592,"date":"2024-06-30T09:56:18","date_gmt":"2024-06-30T09:56:18","guid":{"rendered":"http:\/\/staging.livision-optika.com\/edukativni-centar\/ocna-leca-lens\/"},"modified":"2024-11-11T08:11:22","modified_gmt":"2024-11-11T08:11:22","slug":"ocna-leca-lens","status":"publish","type":"post","link":"https:\/\/livision-optika.com\/edukativni-centar\/ocna-leca-lens\/","title":{"rendered":"O\u010dna le\u0107a (lens)"},"content":{"rendered":"<p><span style=\"font-weight: bold;\">O\u010dna le\u0107a (<span style=\"font-style: italic;\">lat. lens<\/span>) prozirno je tijelo koje se u oku nalazi neposredno iza \u0161arenice, ispred staklastog tijela, i zauzima ve\u0107i dio stra\u017enje sobice. <\/span><\/p>\n<p>Gledano sprijeda ona je okrugla, a gledano u presjeku ovalna (bikonveksna). Gra\u0111ena je, gledaju\u0107i izvana prema unutra, od kapsule, epitelnih stanica i le\u0107nih stanica (fibrila) koje u anatomskom smislu \u010dine jezgru (nukleus) i koru (korteks) le\u0107e, a ukupno se sastoji od 65% vode i 35% bjelan\u010devina te vrlo malo drugih tvari. <\/p>\n<p>Le\u0107a predstavlja glavni opti\u010dki &#8220;ure\u0111aj&#8221; na\u0161eg oka zbog dviju svojih osobina.<br \/>Prvo, potpuno je prozirna pa lako propu\u0161ta svjetlost prema mre\u017enici.<br \/>Drugo, kako je le\u0107a elasti\u010dna, potezanjem zonula koje se hvataju na njen ekvator le\u0107a mijenja svoj oblik i time dioptrijsku snagu te zrake svijetlosti fokusira na mre\u017enicu.<\/p>\n<p>Kod gledanja na blizinu, koristi se akomodacija. Dolazi do opu\u0161tanja cilijarnog mi\u0161i\u0107a i zonularnih vlakana. Kapsula, radi elasti\u010dnosti le\u0107e mijenja oblik i pove\u0107ava njenu lomnu snagu ovisno o starosti.<br \/>Tijekom \u017eivota, mo\u0107 akomodacije le\u0107e slabi, le\u0107a gubi svoju elasti\u010dnost te dolazi do pote\u0161ko\u0107a pri gledanju na blizinu (<span style=\"font-style: italic;\">Presbyiopia<\/span>). <\/p>\n<p><span style=\"font-weight: bold;\">Fizikalne svojstva o\u010dne le\u0107e:<\/span><\/p>\n<p>Lomna jakost (dioptrijska jakost) u stanju mirovanja le\u0107e je +19 D.<br \/>Kod akomodacije se mijenja dioptrija le\u0107e do max +33 D.<\/p>\n<p><span style=\"font-weight: bold;\">Ostali parametri le\u0107e:<\/span><\/p>\n<ul>\n<li>promjer &#8211; 10 mm<\/li>\n<li>debljina &#8211; 4 mm <\/li>\n<li>polumjer zakrivljenosti prednje plohe u mirovanju &#8211; 10 mm<\/li>\n<li>polumjer zakrivljenosti prednje plohe u akomodaciji &#8211; 6 mm<\/li>\n<li>polumjer zakrivljenosti stra\u017enje plohe u mirovanju &#8211; 6 mm<\/li>\n<li>polumjer zakrivljenosti stra\u017enje plohe u akomodaciji &#8211; 5.5 mm<\/li>\n<li>index loma &#8211; 1,42<\/li>\n<\/ul>\n<p>Sama le\u0107a ne sadr\u017ei krvne \u017eile niti \u017eivce, a prehranjuje se preko o\u010dne vodice.<br \/>Starenjem, le\u0107a gubi vodu, zadebljava se, pove\u0107ava specifi\u010dnu te\u017einu, postaje \u010dvr\u0161\u0107a, nukleus le\u0107e se pove\u0107ava, a korteks smanjuje \u0161to izaziva miopizaciju. <\/p>\n<p>Oko s le\u0107om nazivamo faki\u010dno, bez le\u0107e afaki\u010dno, a s umjetnom le\u0107om pseudofaki\u010dno oko.<\/p>\n<p><span style=\"font-weight: bold;\">Pretraga o\u010dne le\u0107e<\/span><\/p>\n<p>Patolo\u0161ke promjene o\u010dne le\u0107e javljaju se u obliku zamu\u0107enja (siva mrena &#8211; katarakta), poreme\u0107enog polo\u017eaja (subluksacija i luksacija) te poreme\u0107aja akomodacije.<\/p>\n<p>Kada le\u0107a izgubi potporu koju joj ina\u010de daju zonularna vlakna, pomakne se prema naprijed ili prema otraga. Takva stanja zovu se subluksacija.<br \/>Kada se le\u0107a potpuno premjesti naprijed u prednju o\u010dnu sobicu ili otraga u staklovinu to je luksacija.<\/p>\n<p><span style=\"font-weight: bold;\">Le\u0107a se mo\u017ee pregledati:<\/span><\/p>\n<ul>\n<li>Pomo\u0107u pove\u0107ala<\/li>\n<li>Pomo\u0107u biomikroskopa<\/li>\n<li>Prosvjetljavanjem zjenice oftalmoskopom<\/li>\n<li>Ultrazvu\u010dnim aparatom<\/li>\n<\/ul>\n<p><span style=\"font-weight: bold;\">Svako zamu\u0107enje o\u010dne le\u0107e mo\u017eemo podijeliti prema vremenu i uzroku nastanka.<\/span><\/p>\n<p><span style=\"font-weight: bold;\">Prema vremenu nastanka:<\/span><\/p>\n<ul>\n<li>Priro\u0111ena<\/li>\n<li>Mladena\u010dka<\/li>\n<li>Stara\u010dka<\/li>\n<\/ul>\n<p><span style=\"font-weight: bold;\">Prema uzroku nastanka:<\/span><\/p>\n<ul>\n<li>Traumatska<\/li>\n<li>Elektri\u010dna<\/li>\n<li>Toplinska<\/li>\n<li>Radijacijska<\/li>\n<li>Dijabeti\u010dka<\/li>\n<li>Kortinzonska<\/li>\n<li>Katarakta kod Downovog sindroma<\/li>\n<\/ul>\n<p><span style=\"font-weight: bold;\">Lije\u010denje katarakte:<\/span><\/p>\n<p>Operacija je jedini i potpuno uspje\u0161ni na\u010din lije\u010denja. Izvodi se ve\u0107inom u lokalnoj, a rijetko u op\u0107oj anesteziji.<\/p>\n<p>Autor:<br \/>bc. Livio Svr\u017enjak, optometrist<\/p>\n","protected":false},"excerpt":{"rendered":"<p>O\u010dna le\u0107a (lat. lens) prozirno je tijelo koje se u oku nalazi neposredno iza \u0161arenice, ispred staklastog tijela, i zauzima ve\u0107i dio stra\u017enje sobice. Gledano sprijeda ona je okrugla, a gledano u presjeku ovalna (bikonveksna). Gra\u0111ena je, gledaju\u0107i izvana prema unutra, od kapsule, epitelnih stanica i le\u0107nih stanica (fibrila) koje u anatomskom smislu \u010dine jezgru [&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-1592","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>O\u010dna le\u0107a (lens)<\/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\/ocna-leca-lens\/\" \/>\n<meta property=\"og:locale\" content=\"hr_HR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"O\u010dna le\u0107a (lens)\" \/>\n<meta property=\"og:description\" content=\"O\u010dna le\u0107a (lat. lens) prozirno je tijelo koje se u oku nalazi neposredno iza \u0161arenice, ispred staklastog tijela, i zauzima ve\u0107i dio stra\u017enje sobice. Gledano sprijeda ona je okrugla, a gledano u presjeku ovalna (bikonveksna). Gra\u0111ena je, gledaju\u0107i izvana prema unutra, od kapsule, epitelnih stanica i le\u0107nih stanica (fibrila) koje u anatomskom smislu \u010dine jezgru [&hellip;]\" \/>\n<meta property=\"og:url\" content=\"https:\/\/livision-optika.com\/edukativni-centar\/ocna-leca-lens\/\" \/>\n<meta property=\"og:site_name\" content=\"Livision\" \/>\n<meta property=\"article:published_time\" content=\"2024-06-30T09:56:18+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2024-11-11T08:11:22+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/livision-optika.com\/edukativni-centar\/wp-content\/uploads\/2024\/11\/anatomija_oka-1024x336.png\" \/>\n\t<meta property=\"og:image:width\" content=\"1024\" \/>\n\t<meta property=\"og:image:height\" content=\"336\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/png\" \/>\n<meta name=\"author\" content=\"admin\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" 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