Iyo lens inoratidzirwa muziso iro rinomiswa pakarepo mushure me iris rinounza misi yechiedza kuti isa pfungwa pa retina . Iyo crystalline lens ndiro zita rakapiwa kune lenzi yemhuka iyo vanhu vanoberekwa nayo. Zviduku zviduku zvakanamatirwa kune lens zvinogona kuita kuti lens ichinje chimiro, iyo inobvumira meso kuisa pfungwa pazvinhu zviri pedo kana kure.
Uyewo Anozivikanwa Se: Crystalline lens
Mabasa eLens
I crystalline lens inopa anenge chikamu chetatu chekuisa simba kweziso. Iko lens inoshandiswa uye inovhara inogona kushandiswa nekukanganiswa kweciliary body. Kana ikashanduka kupera, lens inowedzera uye simba rinowedzera kuitira kuti ziso rinogona kutarisa pamifananidzo pamakwikwi akasiyana. Iko kushanduka kwekutarisa kunonzi kunogara. Apo ziso redu rinotarisa pane chimwe chinhu chiri pedyo zvikuru nesu, ciliary yedu body inobvumirana uye ino inosunungura mabheti emucherechedzi ayo anobata lenzi munzvimbo uye lens rinowedzera. Apo ziso rinotarisa pamifananidzo iri kure, chimiro chechiliary chinodzosera, lenderedzwa yeganda inosimudza zvakare uye lens inoderera muhupamhi uye izvi zvinokonzera mifananidzo kure kure kuva mukutarisa.
The Lens and Refraction
Kugadziriswa, kana kuputika kwechiedza mukati meziso, kunoitika kana chiedza chichifamba nepakati pemarara. Chiedza chinonamatira kunze kana mukati, zvichienderana ne lens.
Iyo lens rinotarisa mifananidzo pane retina. Kana iyo lens inokonzera kugona kuitika shure kwe retina, kutarisa kunowanikwa. Kana iyo lens ichiita kuti chinangwa chiitike mberi kwetina, kuswedera pedyo kunoitika. Kupfekedza magirazi kana kuti ma-lens kugadzirisa matambudziko aya ekuona.
The Lens and Presbyopia
Nokufamba kwenguva, lens rinorasikirwa nehumwe hutsika.
Kurasikirwa uku kunoita kuti ziso rirasikirwe zvimwe zvekukwanisa kwaro kutarisa kune zvinhu zviri pedyo. Ichi chiitiko chinonzi presbyopia. Pakazosvika makore makumi mana, vanhu vazhinji vanoda kuverenga magirazi. Presbyopia inowanzonzi "short arm syndrome" nokuti vanhu vanowanzobata zvinhu zvekuverenga kunze kwemuviri kuti vazviverenge nyore nyore. Vanhu vane presbyopia vangave vachinyunyuta nekuda kuwedzera chiedza kuti vaverenge. Presbyopic meso anonzwawo aneta uye anoita sokuti aneta nyore nyore. Vamwe vanonzi presbyopic varwere vanogonawo kuchinja maonero, sezvo maziso avo ari kuedza kudarika pamusoro pekusaona kwemaonero.
Cataract yeLens
Chirwere chekataract is clouding ye lens. Nharo dzinowanzokura apo isu takura tichiita lensi yakafu. Nenzira yekuti cataract inokura zvishoma nezvishoma, uye inogona kusanganisa maonero kwemakore akawanda. Nezera remakore 65, vanopfuura 90 muzana yevanhu vane cataract.
Kuchengetwa kwechirwere kunosanganisira kushandiswa kwemafupa lenzi. Nokubvisa masikati machero, maonero anovandudzwa pamwe nehupenyu hwehupenyu. Kuvhiyiwa kweCataract kunosanganisira kubvisa cataract uye kuisa itsva, yakajeka lens implant panzvimbo yayo. Nzira yacho inowanzoitwa pasi peanesthesia yepamunharaunda pane imwe nguva, kunze kwekutora nguva shoma pane imwe nguva.