Iris ndiyo chikamu chevara cheziso rinodzora kuwanda kwechiedza chinopinda muziso. Ndicho chikamu chinonyatsooneka cheziso. Iyo iris iri pamberi pekristalline lens uye inoparadzanisa fomu yekamuri yeperiki kamushure. Iris iri mune chikamu chemukati wechirungu chinosanganisira ciliary body iyo inenge iri shure kwe iris.
Iris trisue inoita mudzidzi.
Mudzidzi ndiye gomba munharaunda umo chiedza chinopfuurira kusvika kumashure kweziso. Iris inodzora hukuru hwevadzidzi. Mudzidzi wacho anowanikwa nechepamusoro pacho zvishoma pasi uye zvishoma kusvika kumucheto wepakati wepakati pekonoa.
Mwana wechikoro
Hukuru hwedzidzi hunodzorwa nemasumbu maviri mu iris. Iyo sphincter pupillae inopoteredza muganhu wevadzidzi uye kana iyo iine zvibvumirano, mudzidzi anodzika muhukuru. Izvi zvinonzi miosis. Mutsara wechipiri unodzora ukuru hwevadzidzi ndiyo dilator pupillae. Iyi musuru ine fiber yakarongeka mumutambo we radial mu iris. Kana zvibvumirano, mudzidzi anoderedza kana kuwedzera muhukuru. Izvi zvinonzi mydriasis.
Izvo zvinoshandiswa nemapasismpathy zvinotungamirira s sphincter pupillae uye hurongwa hwekunzwira tsitsi hunodzora dilator pupillae. Iko kuwirirana pakati pemisungo iyi mune izvo izvo zvinosuruvara zvinosunungura zvinofanira kurega kubvumira kuti sphincter inomesa mudzidzi.
Kazhinji vadzidzi vechiyero zvakakura kubva pa2 kusvika ku 4 mm muhupamhi muchiedza kusvika 4 kusvika 8 mm murima.
Iris Color
Iris ruvara runobva pauwandu hwe melanin pigment mu iris. Munhu ane meso ane mavara ane mavara akafanana nee melanin pigment kuti munhu ane ziso rebhuruu ane. Zvisinei, munhu ane maziso ebhuruu ane zvinyorwa zvishoma.
Mushure mei iris inowanzonyanya kuvezwa kuitira kuti kudzivirira chiedza kubva pakupenya kuburikidza ne iris.
Nhaka yemararamiro emuti weruvara inzvimbo yakadzidza zvikuru. Muvara weziso unodzorwa nematatu emagenjini makuru. Vatsvakurudzi vanonzwisisa zviviri zvemajeni avo chaizvo chaizvo uye imwe yadzo ichiri chiduku chechakavanzika. Aya majekesheni anoronga kukura kwemavara echinyakare, machena uye ebhuruu. Grey, hazel, nezvimwe zvinokonzera zvakaoma kufanotaura. Mune dzimwe mhuri, nhaka yemaziso yemaziso inotevera maitiro akafanotaurwa asi, mune dzimwe mhuri, haisi kuita seine musoro kana kutevera mitemo ipi zvayo. Muzvinyorwa, izvi zvinonzi "polygenic." Polygenic zvinoreva kuti panogona kunge kune mazita emakemikari akaomeswa anobatanidzana anobatanidza kuumba mavara eziso. Kunongotaura kuti ruvara runogona kunge rune ruvara rwebhuruu runoita kuti zvinyatsonzwisiswa, asi muenzaniso uyu hauna kunyanya kujeka nokuda kwezvinhu zvakasiyana-siyana zvinoonekwa muupenyu chaihwo.
Kusakanganiswa kweIris & Pupil
Iris uye zvinetso zvevadzidzi zvinosanganisira:
- Aniridia - Aniridia inonzi chiremera chinoshandiswa mumunhu uyo anoberekwa ane iris.
- Coloboma - An iris coloboma igomba guru mu iris
- Synchiae - Synechia is adhesions inowanikwa pakati pe lens ne iris
- Corectopia - Corectopia ndiyo iyo mudzidzi ari kunze
- Dyscoria - Dyscoria chirwere apo mudzidzi akanganisa kana kusina kujeka uye haapfuuri kazhinji