Ukuqonda ukubona eduze (hyperopia)
Ukubuka kude , noma i-hyperopia, ukuphazamiseka kwamehlo lapho iso lingakwazi ukubona amaphuzu aseduze ngokucacile noma amaphuzu aseduze abonakala efiphele. Nakuba kunzima ukubona amaphuzu aseduze, abantu ababona kude bangabona amaphuzu akude 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. Igama elithi Infinity igama elisetshenziselwa ukuchaza ibanga lezinto ezikude kakhulu.
Izimbangela Zokubona Okuseduze
Iso elivamile lingabona iphuzu eliseduze ngokucacile ngoba umsebe wokukhanya ugxile ngqo kwi-retina. Uma iso eliseduze lingakwazi ukubona iphuzu eliseduze ngokucacile, khona-ke umsebe wokukhanya awugxilile neze kwi-retina. Esweni lomuntu elivamile elivamile, umsebe wokukhanya ungagxila ngqo kwi-retina lapho iphuzu eliseduze lingu-25 cm. Uma ugxile endaweni eseduze, ukugoba kwelensi yeso kusezingeni eliphezulu, okusho ukuthi alikwazi ukugoba kakhulu. Ngakho iphuzu eliseduze elingu-25 cm liyibanga elincane kakhulu lapho i-radius yokugoba kweso ingenakuncishiswa khona kakhulu.
Amehlo aseduze awakwazi ukugxila endaweni eseduze engama-25 cm ukusuka esweni, ngakho-ke amehlo aseduze anobude obukhulu bokugxila kanye nerediyasi yokugoba uma kuqhathaniswa namehlo avamile. I-cornea kanye nelensi kunesibopho sokubuyisa ukukhanya, ngakho-ke kungaphethwa ngokuthi amehlo aseduze ane-cornea namalensi angagobile kangako noma ayisicaba ukuze irediyasi yokugoba kanye nobude bokugxila kwamehlo aseduze ibe nkulu, kuyilapho amehlo avamile ene-cornea namalensi agobile kakhulu noma ayisicaba kangako ukuze irediyasi yokugoba kanye nobude bokugxila ibe ncane.
Ngokusekelwe encazelweni yangaphambilini, kungaphethwa ngokuthi imbangela yokungaboni eduze ukuthi i-cornea kanye nelensi yeso akugobile kangako kunalokho okufanele kube yiso elivamile, ukuze ubude obuqondile besistimu ye-cornea-lens bube bukhulu, okubangela ukukhanya okuvela... eduze nendawo ayikwazi ukugxila ngqo ku-retina kodwa igxile ngemuva kwe-retina. Imisebe yokukhanya evela ezintweni eziseduze ayigxili ku-retina, ngakho-ke amangqamuzana ezinzwa ku-retina awakwazi ukuguqula amaza okukhanya abe amasignali kagesi abese edluliselwa ebuchosheni.
Esinye isizathu sokuba umuntu ahlushwe ukubona eduze ukuthi ingxenye evundlile yeso lomuntu imfushane kakhulu kangangokuthi imisebe yokukhanya ephikiswa yi-cornea nelensi iwela ngemuva kwe-retina.
I-Hyperopia kanye presbyopiaI-Presbyopia isifo samehlo lapho ikhono lamehlo lokwamukela lincipha khona ukuze indawo eseduze isuke njengoba umuntu ekhula. I-Presbyopia kubangelwa izici zokuguga kuyilapho i-hyperopia ibangelwa izici zofuzo noma zefa.
Isixazululo Sokubona Okuseduze
Iso elibona eduze ligxila imisebe yokukhanya evela endaweni eseduze ngemuva kwe-retina. Ukuze ukubona eduze kubuyele esimweni esijwayelekile, imisebe yokukhanya kumele igxile kwi-retina. Imisebe yokukhanya ingagxila kwi-retina ngokubeka ilensi ehlanganayo , eyaziwa nangokuthi ilensi eqondile, phambi kweso. Ilensi eqondile isiza ukuhlanganisa imisebe yokukhanya ukuze igxile ngqo kwi-retina.
Empilweni yansuku zonke, ukubona eduze kungalungiswa kusetshenziswa izibuko zamehlo noma amalensi okuxhumana. Izincazelo ezinemininingwane kanye nezibalo zalokhu zingatholakala ezihlokweni ezikhuluma ngezibuko zamehlo namalensi okuxhumana.
