{"id":46666,"date":"2023-03-27T20:27:11","date_gmt":"2023-03-27T19:27:11","guid":{"rendered":"https:\/\/www.narodnilijek.com\/web\/?p=46666"},"modified":"2023-03-27T20:27:14","modified_gmt":"2023-03-27T19:27:14","slug":"zjenica","status":"publish","type":"post","link":"https:\/\/www.narodnilijek.com\/web\/zjenica\/","title":{"rendered":"O\u010dne smetnje: Promjene veli\u010dine i oblika zjenice"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\">Zjenica (pupila) je otvor u \u0161arenici oka kroz koji ulaze zrake svjetla, i igra klju\u010dnu ulogu u dijagnostici <strong>zdravlja oka<\/strong>. Ovisno o ja\u010dini svjetla, zjenica se su\u017eava i \u0161iri, poput \u201cblende\u201d na fotografskom aparatu, zjenica odre\u0111uje koli\u010dinu svjetla koje ulazi u oko.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Zjenica oka <\/strong>je crni krug u sredi\u0161tu \u0161arenice. \u0160arenica je obojeni dio oka \u010dija je struktura i boja jedinstvena za svaku osobu. Kad je mrak, na\u0161e se zjenice \u0161ire ili otvaraju kako bi u\u0161lo vi\u0161e svjetla. Na taj na\u010din pobolj\u0161avamo vid. Pri jakom svjetlu, na\u0161a se zjenica skuplja na vrlo mali promjer kako bi za\u0161titila osjetljive fotoreceptore u na\u0161oj mre\u017enici. Upravo tu ulogu ima zjenica u oku.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Zjenica je normalno \u0161iroka od 2 do 4 mm, ali mo\u017ee se smanjiti na 1,5 mm i pro\u0161iriti \u010dak do 8 mm. Su\u017eavanje i \u0161irenje zjenice odvija se bez na\u0161e volje jer tim funkcijama upravlja automatski <a href=\"https:\/\/hr.wikipedia.org\/wiki\/%C5%BDiv%C4%8Dani_sustav\"><strong>nervni sistem<\/strong><\/a>, koji preko parasimpatikusa zjenicu su\u017eava, a preko simpatikusa pro\u0161iruje.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Zjenica oka<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\u0160irina zjenice je razli\u010dita u razli\u010ditoj dobi \u017eivota. U male djece zjenice su u\u017ee, u mladosti se pro\u0161ire, da bi pod starost ponovo postale u\u017ee. <strong>Su\u017eenje zjenice<\/strong> (mioza) imaju ljudi s tamnijim o\u010dima, dalekovidne osobe, svi ljudi za vrijeme spavanja, dubokoga izdisaja, jakoga svjetla, prilikom gledanja (fiksiranja) predmeta.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Su\u017eena zjenica \u010desta je prilikom upala oka kada postoji jaka preosjetljivost na svjetlo. Neka otrovanja tako\u0111er dovode do jako su\u017eene zjenice, npr.: otrovanje sredstvima za uni\u0161tavanje gamadi (organofosforni preparati), zatim zbog uzimanja lijekova kao \u0161to je morfij, pilokarpin itd.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><a href=\"https:\/\/www.narodnilijek.com\/web\/bolovi-u-oku\/\"><strong>Za\u0161to se javljaju bolovi u oku?<\/strong><\/a><\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Pro\u0161irene zjenice <\/strong>(midrijaza) vide se prilikom jakih emocija kada je nadra\u017een simpatikus, jakoga bola, srd\u017ebe, bijesa i straha. U narodu se ka\u017ee: \u201cU strahu su velike o\u010di\u201d. Zjenice su pro\u0161irene pri slabom osvjetljenju, u mraku, u stanju dubokoga gubitka svijesti, slabokrvnosti, u pijanom stanju.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Mnogi lijekovi dovode do \u0161iroke zjenice, npr. atropin, beladona. <strong>Zjenice<\/strong> su normalno okrugle, jednako pro\u0161irene i ravnih rubova, mogu biti nazubljene ako je poslije upale \u0161arenice zjenica srasla s le\u0107om, osim \u0161to je nazubljena, zjenica je i uko\u010dena.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Zjenice mogu biti i <strong>nejednake<\/strong> (anizokorija) i mogu se vidjeti u ja\u010dem stupnju pijanstva. Nejednake zjenice uvijek su znak opasnosti. Zbog povrede glave nejednake zjenice ukazuju na o\u0161te\u0107enje mozga, tj. na krvarenje u mozgu. Nejednake su zjenice i kod nekih tumora mozga, \u010desto kao prvi znak bolesti.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Zjenica oka tako\u0111er igra klju\u010dnu ulogu u dijagnostici zdravlja oka. Lije\u010dnici mogu koristiti veli\u010dinu zjenice kao pokazatelj zdravlja nervnog sistema. Na primjer, osobe sa o\u0161te\u0107enjem nervnog sistema mogu imati nesposobnost reguliranja veli\u010dine zjenice. Tako\u0111er, iznenadna promjena veli\u010dine zjenice mo\u017ee se pojaviti na zdravstvenim problemima, uklju\u010duju\u0107i migrenu, traumu glave ili upalu o\u010diju.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><a href=\"https:\/\/www.narodnilijek.com\/web\/trahom-oka\/\"><strong>Trahom bakterijska upala oka \u2013 uzroci, simptomi i lije\u010denje<\/strong><\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Zjenica (pupila) je otvor u \u0161arenici oka kroz koji ulaze zrake svjetla, i igra klju\u010dnu ulogu u dijagnostici zdravlja oka. Ovisno o ja\u010dini svjetla, zjenica se su\u017eava i \u0161iri, poput \u201cblende\u201d na fotografskom aparatu, zjenica odre\u0111uje koli\u010dinu svjetla koje ulazi u oko. Zjenica oka je crni krug u sredi\u0161tu \u0161arenice. \u0160arenica je obojeni dio oka [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":46668,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"jetpack_post_was_ever_published":false,"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_publicize_message":"","jetpack_publicize_feature_enabled":true,"jetpack_social_post_already_shared":true,"jetpack_social_options":{"image_generator_settings":{"template":"highway","default_image_id":0,"enabled":false},"version":2}},"categories":[1],"tags":[108583,855,108582,108580,108581,19,2282,108579,6302],"class_list":["post-46666","post","type-post","status-publish","format-standard","has-post-thumbnail","category-zdravlje","tag-nejednake-zjenice","tag-oko","tag-prosirena-zjenica","tag-prosirene-zjenice","tag-suzena-zjenica","tag-zdravlje-2","tag-zjenica","tag-zjenica-oka","tag-zjenice"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v25.3.1 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>\u0160ta nam govori kad se zjenica oka su\u017eava ili \u0161iri<\/title>\n<meta name=\"description\" content=\"Za\u0161to se zjenica oka su\u017eava, \u0161iri ili su nejednake? 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