Amehlo akho ayizici eziyinkimbinkimbi kakhulu. Ukuze amehlo akho abone, kufanele kube nokukhanya. Imisebe ekhanyayo iveza into bese ingena iso ngokusebenzisa i- cornea . Ngemuva kweso lakho ukukhanya kugxilwe yi-retina, bese kuguqulwa ibe amasignali kagesi ukuze athunyelwe ebuchosheni. Uma ubuchopho bewuthola izimpawu, umbono ubonakala.
Uma iso lakho lingakwazi ukugxila ngokuqondile isithombe, kuthiwa unephutha lokucubungula .
Udokotela wezilanga anganquma uhlobo lwephutha lokubuyisa ngokuhlolwa okubizwa ngokuthi i-refraction. Ukulungisa iphutha lokubuyisa kutholakala ngezibuko, othintana nabo noma ukuhlinzwa okuqhubekayo. Lona umbono wesintu oyisisekelo.
I-Acuity Acuity ne-Refractive Errors
Ubuningi obubonakalayo buyingxenye yokucaca nokubukeka kombono wakho. Ukulinganisa ubuciko bakho obubonakalayo kuyindlela esheshayo yokuhlinzekwa kwezempilo ukuze uthole izinkinga zombono. Ukuqina okuvamile okubukwayo kuboniswa njengama-20/20 futhi kubonisa imininingwane encane kakhulu umuntu okufanele akwazi ukubona ebangeni elilinganiselwe lokuhlola elingamamitha angu-20. Imiphumela yokuhlolwa kwe-acuity yemiphumela kusiza ochwepheshe bezokunakekelwa kwezempilo ukuthi banqume ukuthi kungenzeka yini ukuthi ungasondeli , uphelele noma ube ne- astigmatism .
Izinketho zokulungisa
Umbono ungalungiswa ngezindlela eziningi. Ama-Eyeglass athuthukisa umbono ngokugoba ukukhanya. Ziyiziphephile, amadivaysi okulungisa okwezomnotho. Olunye ukhetho lokuboniswa kombukiso yi-contact lens. Abantu abanokuphila okusebenzayo bayakujabulela ukugqoka amalensi oxhumana nabo ngoba bahlala endaweni engcono kunezibuko.
Ukuhlinzwa okulungiswayo kuyindlela enye yokulungisa izinkinga zombono. Ukuhlinzwa okuqhubekayo kuvuselela iso ukuze kulungiswe amakhono ayo okugoba ukukhanya ukuze ikhwalithi yombono ithuthukiswe ngaphandle kokusetshenziswa kwezinsiza ezibonakalayo ezengeziwe.
Izinkinga ezihlobene nobudala
Njengoba sikhula, amathuba okuthuthukisa izimo nezifo ezithile zeso zanda.
Ikhono lokunciphisa ukugxila ebangeni eliseduze liyaziwa njenge- presbyopia , isimo esivame ukubonwa kubantu abangaphezu kwamashumi amane. Njengoba sikhula, ikakhulukazi eminyakeni engamashumi ayisithupha, i-lens yemvelo yeso futhi iqala ukuthola isibhakabhaka, isimo esibizwa ngokuthi i-cataract. Ngalolu shintsho, isidingo sethu sokwenyuka kokukhanya nokushintshaniswa kangcono kokushintshaniswa. Okokugcina, njengoba sikhula, ingozi yokuthuthukisa isifo se-eye eyomile, ukuguqulwa kwe-macular kanye ne-cataracts enkulu kakhulu.