I-Arcus senilis iyindandatho ye-opaque emhlophe noma emhlophe noma i-arc emhlabeni jikelele. I-cornea iyisakhiwo esicacile, esifana nesimo se-dome engxenyeni engaphambili yeso. I-cornea yenziwe ngezingqimba ezingu-6 ezahlukene futhi ngokuvamile ivulekile. I-cornea inikeza ingxenye enkulu yamandla okuphikisa okwehlo ukuze imisebe ekhanyayo ikwazi ukubuyela ku-retina. U-Arcus senilis ubonakala njalo asebekhulile, kepha ngezinye izikhathi ukhona lapho ezalwa.
Lapho i-arcus senilis iqala impilo yokuqala noma ephakathi, ibizwa ngokuthi i-arcus juvenilis. I-arc noma indandatho eyenzeka nge-arcus senilis ivela nge-lipids (amafutha) noma i-cholesterol efakwe ku-cornea.
Izimbangela
U-Arcus cishe uzokhula kuwo wonke amehlo ethu uma siphila isikhathi eside ngokwanele. Kubantu abaningi, i-arcus iyinhlonipho futhi ngeke ithinte umbono. Kodwa-ke, uma i-arcus iqala kubantu abancane kuneminyaka engamashumi amane, kunesizathu sokukhathazeka. Ngoba i-arcus idiphozi ye-lipids, uma une-arcus futhi uneminyaka engaphansi kwengu-40, ingaba amazinga aphakeme egazi le-lipid ngakho-ke kungenzeka i-cholesterol ephezulu.
Ukuxhumeka phakathi kwe-arcus ne-cholesterol ephezulu noma isifo sokuqina kwesifo somzimba sekuye kwaba impikiswano enkulu. Kusukela ngo-1852, udokotela wezilwane waseJalimane uRudolf Virchow waxoxa ngokuhlangana phakathi kwe-corneal arcus ne-atherosclerosis. Kodwa-ke, cishe eminyakeni engaba ngu-40 kamuva, udokotela uWilliam Osler wasikisela ukuthi i-arcus yayingekho ukuxilongwa "kokushisa okunamafutha" kwenhliziyo.
Ngisho namanje, ukuxhumana phakathi kwe-arcus ne-vascular lipid deposits kuyinkinga enkulu. Ngonyaka ka-2008, iNational Institutes of Health yanyathelisa indaba eyaphetha ngokuthi: "I-Corneal arcus ibonisa ukuthunyelwa kwesisindo somzimba esasakazeke futhi ihambisana nokubili kwe-calcific atherosclerosis kanye ne-xanthomatosis kulezi ziguli.
Iziguli ezine-arcus ezinzima zivame ukuba ne-calcific atherosclerosis kakhulu. I-Corneal arcus ... ikhombisa ukuqina kwe- atherosclerosis ekhulile kulezi ziguli ze-hypercholesterolemic. "
Ukuxilongwa
Uma odokotela benza ukuhlolwa kwamehlo , kunezici eziningi ezicatshangelwa ngaphambi kokuhlola. Isibonelo, uma udokotela ebona umfana osemusha, uzobheka ngokucophelela lokho okutholakele ku-retina. Ngesikhathi sokuhlolwa, amaconsi e-eye akhethekile azofakwa esweni ukuze athulule umfundi. Lapho iso lihlanjululwa, izitsha zegazi zokubuyisela zihlolwe izibonakaliso zesifo. Ukubonakala kwamanzi nezikebhe zegazi kunganikeza izinkomba ezingeni eliphezulu ze-lipid kanye ne-atherosclerosis. Uma kubonakala sengathi kune-atherosclerosis ye-retinal yegazi, futhi isiguli senzeke nokuba ne-arcus, ngakho-ke kungenzeka ukuthi uzophakamisa ukuvakashela udokotela wakho wokunakekela oyinhloko, i-internists noma i-cardiologist.
Ukwelapha
Ayikho indlela enhle yokwenza i-arcus ihambe. Abanye baye bakhuthaza ukudweba kwamehlo ukusiza ukumboza. Kodwa-ke, ngokuyinhloko, lokhu akunconywa emphakathini wezokwelapha.
Okufanele Ukwazi
Odokotela abaningi bamehlo benza ngendlela ejwayelekile engqondweni uma kuziwa ku-arcus.
Ezigulini ezingaphezu kweminyaka engamashumi amane ubudala, i-arcus ivame ukutholakala okungenangqondo. Kodwa-ke, uma usemncane kuneminyaka engamashumi amane, bheka udokotela wakho womndeni futhi okungenani uhlolwe amazinga egazi le-cholesterol. Ngenxa yokuthi uneminyaka engaphansi kwengu-40 futhi une-arcus, akusho ukuthi ukhulule kakhulu amazinga we-lipid, kodwa ngesikhathi esincane kakhulu kunconywa ukuba uhlolwe.
Futhi eyaziwa ngokuthi: Arcus senilis corneae