Iso iyisitho esithola ukukhanya futhi ithumela amasignali ku-nertic optic ebuchosheni. Kubantu, iso liyisici esiyigugu esinika amandla okubona. Ivumela umbono wokukhanya nombono, kufaka phakathi ikhono lokuhlukanisa phakathi kwemibala nokujula.
Nanobukhulu obukhulu, iso liyilungu eliyinkimbinkimbi kakhulu. Iso lilinganiselwa ku-1 intshi ububanzi, 1 inch deep futhi 0.9 amasentimitha ubude.
Iso lomuntu linama-degree angama-200 okubukwa futhi lingabona imibala eyizigidi ezingu-10 namasithunzi. Abantu banamehlo amabili asivumela ukuba sibe nokuqonda okujulile kokujula kanye nesimo se-binocular stereopsis.
Anatomy of the Eye
- I-Cornea - I- cornea iyisakhiwo esicacile, esifana nesimo sezulu esifundeni esingaphambili kweso. I-cornea ihambisa 2/3 yamandla okuphikisa amehlo.
- I-conjunctiva - I-conjunctiva iyinambuzane ye-mucus ehlanganisa ubuso behlo kunye nengxenye yangaphakathi yamajwabu amehlo.
- I-Sclera - I-sclera yiyona emhlophe, enzima, engaphandle kwesembozo sezwe. I-sclera iyaqhubeka ne-cornea.
- Iris - i- iris iyisisindo esinama-pigmented with muscle emibili esilawula ukuqhutshwa komfundi nokufundiswa komfundi. Iris isebenza njenge-diaphragm elawula ukukhanya okuvunyelwe esweni. Iris iyinxenye engemibala yeso.
- Umfundi - Umfundi ungumgodi phakathi kwe-iris lapho ukukhanya kudlula khona ku-retina. Umfundi ubumnyama ngoba ukukhanya okuvunyelwe esweni kufakwe kwi-retina.
- I-Anterior Chamber - I-anterior chamber igumbi eligcwele amanzi ophakathi kwe-iris kanye ne-inner cornea engaphakathi kwe-endothelium. Ihlaya elimnandi yilona owuketshezi ogcwalisa ikamelo langaphakathi
- Imishanguzo enomsoco - I-meshwork engathandekiyo iyimifino yezincubu eziseduze ne-cornea, engxenyeni yeso. Le meshwork enobungozi iqhubeka nomzimba we-ciliary. Kubophezele ukukhipha amahlaya aqueous engxenyeni ka Schlemm (amashubhu okugeleza) nasesimweni segazi.
- I-Crystalline Lens - I-lens yama-Crystal inikeza u-1/3 we-refracting noma igxile amandla emehlweni. Kuyinto izicubu ezinamafutha angashintsha indlela yokwandisa noma ukunciphisa amandla ayo. Ngoba ingashintsha ukuma, ivumela iso ukugxila ezintweni eziphakathi nendawo eziseduze.
- Umzimba we-Ciliary - I- lens yama-Crystal ifakwe emzimbeni we-ciliary ngama-lens zonules. Umzimba we-ciliary uyisiphako esingakwazi ukuvumelanisa ukushintsha isimo se-lens. Lokhu kuvumela abantu ukuba bagxile ngokucophelela ezintweni eziseduze. Olunye umsebenzi womzimba we-ciliary ukukhiqiza amahlaya aqueous egeleza egumbini langaphakathi.
- I-Retina - I-retina iyisisindo esibucayi esithinta amandla amancane nokudlulisela amandla ku-brain njengemigudu yezinzwa
- I-nertic optic - I-nertic optic iyinethiwekhi yamangqamuzana e-nerve athola impulses kusukela ku-layer fibre nerve kwi-retina. Idlulisela izimpikiswano zesibindi ebuchosheni.