Iyo cornea ndiyo yakajeka, dome-yakafanana sarudzo pamucheto wekutanga weziso. Iyo cornea inopa ziso zviviri-zvitatu zvekuisa pfungwa kana kugadzirisa simba. Chimwe chetatu chinobudiswa nechomukati crystalline lens.
Basa
Iyo cornea inoshanda seikamera yemamera, ichibatsira kutarisa chiedza ichipinda muziso pane retina. Iyo cornea inozarawo nemitsipa iyo inotitarisa isu kune kutsamwa kunogona kukanganisa kuonekwa kwedu uye utano hweziso.
Chii Chinogadzirwa?
Iyo cornea inhengo inoshamisa inoshandiswa nemasero anozivikanwa. Chimwe chinhu chakasiyana nekorne ndechekuti hakuna mutezo yeropa mumakora kuti ugozvipa kudya. Ironea inogamuchira zvakawanda zvekudya kwayo zvakananga kubva pamisodzi pamusoro pepamusoro uye kuburikidza nemhepo inonyanyisa (inobudisa mvura inozadza chipinda chemukati cheziso) kubva mukati meziso. Nemhaka yekuti cornea yakafanana ne-lens, inofanirwa kuva yakajeka uye mitsipa yeropa inogona kupindira nekutarisa.
Mhuka dzomukati dzakarongwa mumatanhatu matanhatu akasiyana:
- Epithelium - Epithelium ndiyo yakakwirira kwazvo, kunze kwepamusoro uye inoita inenge 10 muzana yemakorome. Epithelial cells dzinoshumira kudzivirira iyo cornea, kutakura michero kune imwe yose ye cornea uye inopa kubwinya kwakanyatsoonekwa pamusoro pechimwe chiedza chekutarisa. Epithelial cells uyewo ane zviuru zvemitsipa shoma. Aya mavhinga ane kurwadziwa kukuru uye anotibvumira kuziva kana chimwe chinhu chiri kukuvadza ziso. Epithelial cells dzinokura kumusoro kwemuviri wepasi.
- Layman's Layer - Bowman's layer is directly under the epithelial layer. Iyo yakagadzirwa collagen tissue. Bowman's layer is tough, but if it is damaged, scar scar tissue can form and recurrent openings of the injury can occur.
- Stroma - I stroma inoita huwandu hwekodeni. Inosanganisira mvura uye collagen. Iko collagen inobvumira kuve pachena uye kumira kwekromaa. Izvo zvikamu zve collagen zvinotumidzwa semamellae nekuda kwenzira yavanorayirwa uye yakavezwa mukati me stroma. Chikamu chinonzi anterior chikamu che stroma chakave chakasvibiswa zvakasiyana nechinonzi posterior chikamu che stroma. Izvi zvinopa kornea simba, maitiro, uye pachena. Iyo stroma ndiyo chikamu chernea chinoshandiswa apo chirwere chinoputika, chakadai seLASIK .
- Dua's Layer - Dua's layer of the cornea ichangobva kuwanikwa uye kutsvakurudza kuri kumirira. Zvisinei, inofungidzirwa nekutarisa kwemaziso akawanda masayendisiti kuva imwe nzvimbo isati yazivikanwa yakangoita mamita michironi. Purofesa Harminder Dua akawana kuvhara pakati pekodheal stroma neDeccet membrane. iyo inofungidzirwa kuti inopa simba kune cornea uye ruzivo rweDua's layer runopa ruzivo rwekuvandudza kuchengeteka kwekuvhiya uye nei vamwe vanhu vachikudzidzira mamwe marudzi eorneal disease.
- Membrane yeDescemet - Chikamu chinotevera pasi pe stroma ndicho chikwata cha Descemet. Dumbu reDescemet isimbi yakasimba asi yakasvibira inochengetedza cornea pamusoro pekukuvadzwa uye utachiona. Dumbu reDescemet rinogadzirwawo nerudzi rwakasiyana rwegorogen uye rinobudiswa ne endothelial layer zvakananga pasi payo.
- Endothelium - The endothelium inotapira masero ayo anoshandiswa kuchengeta cornea zvakajeka nguva dzose. Endothelial masero anobata semapumpu maduku kuti awedzere mvura yakawanda kunze kwe stroma uye kumashure muziso. Kana endothelial masero asingashande zvakanaka, iyo cornea nokuti ine makore uye yakaoma kuona. Endothelial masero anokosha kuhutano hwe-cornea. Kana zvikaparara kana kuparadzwa, iyo cornea ichaderedza.
Kuyera uye Kuongorora
Vanachiremba veziso vanogona kuona iyo cornea pasi pechigadziko chemwenje chinokonzera biomicroscope. Chiedza chekatsotsi ndechekuti microscope yakarurama. Chitubu chakakosha chinoshandiswa kujekesa zvikamu zvakasiyana zvekornea. Kuti uone kuwanda kwekonoa, vanachiremba vanoita pachymetry . Pachymetry inogona kuitwa kuburikidza ne-ultrasonic pachymeter kana kushandisa sangano rinopindirana tomographer . Simba uye kuputika kwekonoa kunogona kuyerwa ne- corneal topographer .