Ukuqonda Ukungaboni Kafushane (i-myopia)
Okubona eduze noma myopia kuyinto engavamile izinsimbi zokukhanya lapho amehlo engaboni khona iphuzu elikude kusobala noma iphuzu elikude libukeka lifiphele. Nakuba kunzima ukubona iphuzu elikude, iso elibona eduze lingabona eduze nendawo ngokucacile. Iphuzu eliseduze yibanga eliseduze kakhulu iso elivamile elingalibona ngokucacile. Umuntu ojwayelekile onamehlo ajwayelekile unephuzu eliseduze elingama-25 cm. Iphuzu elikude yibanga elikude kakhulu iso elivamile elingalibona ngokucacile. Umuntu ojwayelekile onamehlo ajwayelekile unephuzu elikude kakhulu lokungapheli. I-Infinity igama elisetshenziselwa ukuchaza ibanga lento ekude kakhulu.
Izimbangela Zokubona Izinto Ezikude
Amehlo avamile angabona izinto kude okungenamkhawulo ngokucacile ngoba imisebe yokukhanya evela entweni igxile ku-retina, okwenzeka lapho ubude bokugxila uhlelo lwe-cornea-lens lweso elivamile lufana nolwe- ibanga lesithunzi (qhathanisa nencazelo ngesihloko izinsimbi zokukhanya). Uma iso elibona eduze lingakwazi ukubona into ebangeni elingenamkhawulo ngokucacile, khona-ke ukukhanya okuvela entweni ekude kakhulu akumelwe kugxile ku-retina, okwenzeka lapho ubude obuqondile besistimu yelensi ye-cornea yeso elibona eduze bungafani nebanga lesithombe. Uma ubude obuqondile (f) belensi yeso elibona eduze bungafani nebanga lesithombe (s'), khona-ke ubude obuqondile kanye nerediyasi yokugoba kwelensi yeso elibona eduze kumele kube kuncane kunobude obuqondile kanye nerediyasi yokugoba kwelensi yeso evamile. Ngamanye amazwi, uhlelo lwelensi ye-cornea yeso elibona eduze olunesibopho sokubuyisa imisebe yokukhanya lugobile kakhulu noma luphansi uma luqhathaniswa nohlelo lwelensi ye-cornea yelensi yeso evamile.
Ngokusekelwe encazelweni yangaphambilini, kungaphethwa ngokuthi imbangela yokungaboni kahle ukuthi uhlelo lwe-cornea-lens lugobile kakhulu kunalokho okufanele lube yikho emehlweni avamile ukuze ubude bokugxila kohlelo lwe-cornea-lens buncishiswe, okubangela ukuthi imisebe yokukhanya evela ezintweni ezikude kakhulu (indawo ekude) ingagxili ku-retina kodwa igxile phambi kwe-retina. Imisebe yokukhanya evela ezintweni ezikude kakhulu ayigxili ku-retina ukuze amangqamuzana ezinzwa ku-retina angakwazi ukuguqula amaza okukhanya abe izimpawu zikagesi ezidluliselwa ebuchosheni.
Esinye isizathu somuntu ohlushwa ukubona eduze ukuthi ingxenye evundlile yeso lomuntu inde kakhulu kangangokuthi imisebe yokukhanya ephikiswa uhlelo lwe-cornea-lens iwela phambi kwe-retina.
Isixazululo Sokubona Izinto Ezikude
Iso elibona eduze ligxila imisebe yokukhanya evela entweni ekude kakhulu (indawo ekude) phambi kwe-retina. Ukuze iso elibona eduze libuyele esimweni esijwayelekile, imisebe yokukhanya kumele igxile ngqo kwi-retina. Imisebe yokukhanya ingagxila ngqo kwi-retina uma ibekwe ilensi ehlukahlukene Ilensi egobile, eyaziwa nangokuthi ilensi engemihle, itholakala phambi kweso. Ilensi ephambukayo isiza ekusabalaliseni imisebe yokukhanya ukuze igxile ngqo ku-retina.
Empilweni yansuku zonke, ukubona eduze kungalungiswa kusetshenziswa izibuko noma ama-contact lens. Incazelo eningiliziwe kanye nezibalo zalokhu kungatholakala esihlokweni esithi amalensi ezibuko zamehlo dan amalensi okuxhumana.
