Chokodzoka ndizomwe zimakhala pakati pa retina ndi sclera. Chokotchi chimakhala chachikulu kwambiri kumbuyo kwa diso pafupifupi 0,2 mm ndipo chimachepa kufika 0,1 mm m'mbali mwa diso. Lili ndi maselo a epithelial a retina ndipo amapereka mpweya ndi zakudya ku retina yakunja. Choroids imapanga tsamba lomwe lili ndi iris ndi body ciliary.
Chosekemera chapangidwa ndi zigawo zinayi zosiyana:
- Mzere wa Haller (lalikulu chotengera magazi)
- Mchenga wa Sattler (mitsempha ya m'magazi yapafupi)
- Choriocapillaris (capillaries)
- Nthano ya Bruch. (nembanemba pamkati mwa chokopa.)
Mbalame yotchedwa melanin pigment mu choyikasi imapangitsa kuwala ndi malire mkati mwa diso lomwe lingasokoneze masomphenya. Mankhwala a melanin amagwiritsidwanso kuti amateteza mitsempha ya mitsempha yowopsya yowononga poizoni. Mtoto wa choroids umayambitsa "maso ofiira" pamene zithunzi zowala zimatengedwa.
Komanso: chithandizo; chovala choda
Kuwonjezera pa kupereka retina yaikulu ya mpweya ndi magazi ku retina, kuthamanga magazi kumatentha komanso kumasangalatsa retina. Chokodzokacho chimakhalanso ndi maselo omwe amachititsa kuti zinthu zisawonongeke. Chokomacho chingasinthe makulidwe ndipo kusintha kumeneku kungachititse retina kutsogolo ndi kumbuyo, kubweretsa zithunzi zojambula mu ndege yoyang'ana.
Izi sizimabweretsa zotsatira zambiri koma ndizofunika kwambiri pakukula kwa diso pamene mwana ali.
Maso anu ndi masomphenya abwino amadalira magazi okwanira kuti agwire ntchito. Choncho, chosetichi chiyenera kukhala chotheka nthawi zonse. Dera la diso lomwe limakhudzana ndi chithokomiro limatuluka m'njira iliyonse, mitsempha yotchedwa macula ndi optic imatha kuvutika.
Pamene mitsempha yamagetsi ndi optic imakhudzidwa kapena kuipweteka, zotsatira zake nthawi zambiri zimakhala zochepa m'masomphenya ndipo nthawi zina ngakhale khungu lathunthu. Kuonjezera apo, matenda ena akuluakulu amatha kuchitika chifukwa cha matenda.
Matenda ndi Matenda a Choroid
- Chitetezo chodzidzimutsa chotchedwa Hemorrhagic choroidal chimatentha m'mlengalenga pamwamba pa kansalu kapena chokongoletsera chomwe chimabwera chifukwa cha zitsulo zamoto. Ngakhale zikhoza kuchitika mwadzidzidzi, ndizovuta kwambiri. Kaŵirikaŵiri zimachitika chifukwa cha kupweteka kwa maso panthawi ya opaleshoni ya maso. Chitetezo chodzidzimutsa chodzidzimutsa chimatha kupanga zizindikiro zazikulu. Kuchiza kumaphatikizapo madontho a maso a topical steroid, madontho a maso a cycloplegic , ndi kupondereza kwa diso kutsika madontho a diso.
- Kuphulika kwa khungu kumakhala kochepa kwambiri mu ntchentche ya choroid, Bruch's epithelium yomwe imapezeka chifukwa cha kukhumudwa kwamaso monga kugunda ndi chifuwa. Mwamwayi, mapulogalamu ambiri a choroids amagwira pakati pa retina, yotchedwa macula. Macula imatilola ife kukhala ndi khalidwe lapamwamba, masomphenya apakati. Kuvulala kumabweretsa imfa ya photoreceptors mu macula ndi kutayika pakati pa masomphenya. Ngati kupasuka sikuli mu macula, masomphenya oyambirira amasungidwa.
- Choroidal nevi ndi mndandanda wa maselo osakanizika kapena osakanizika mu kakompyuta, mzere wosanjikiza pansi pa retina. Mitundu yambiri ya choroidroid imangoyang'aniridwa. Dokotala wanu akujambula malo omwe akudandaula ndikuwunika kawirikawiri. Ambiri samasowa chithandizo chilichonse. Ngati choroidal nevus ali ndi lalanje pigmentation, amaoneka okwezeka, kapena ali ndi mawonekedwe achilendo, n'zotheka kuti akhoza kukhala chotupa khansa ya khansa. Pankhaniyi, chithandizo chamanyazi n'chofunika.
Dysstrophies ya choroid ndi gulu la matenda obadwa nawo omwe amakhudza chokoma. Choroideremia, Gyrate atrophy, Central isolar choroidal dystrophy, Choroidal atrophy ndi zina zochititsa chidwi retinochoroidal atrophy ndi zitsanzo za mafilimu osokoneza bongo. Kuwonongeka kwakukulu kwa masomphenya kungathe kuchitika mwa zina mwazirombozi.
Chorioretinitis ndi matenda omwe amawopsa kwambiri. Kutupa kotereku kumabweretsa mdima wandiweyani ndi masomphenya ophwanyika. Ana aang'ono ndi anthu omwe akulimbana ndi HIV ya Herpes Simplex nthawi zambiri amakhudzidwa ndi matendawa. Maantibayotiki ndi corticosteroids amagwiritsidwa ntchito kuti athetsere chorioretinitis.