Amehlo akho ayinkimbinkimbi kakhulu. Ukuze amehlo akho abone, kufuneka kube lula. Imilayezo yokukhanya ibonakalisa into kwaye ungene iso nge- cornea . Emva kweso lakho ukukhanya kugxininiswe yi-retina, ngoko iguqulwa ibe yimiqondiso yamandla ukuze ithunyelwe kwingqondo. Xa ubuchopho bufumana iimpawu, umbono ubonakala.
Ukuba iliso lakho alikwazi ukugxininisa ngokufanelekileyo umfanekiso, kuthiwa yinephutha lokuphikisa .
Ugqirha wezilanga unokumisela uhlobo lwesiphene sokumelana nokuhlolwa okubizwa ngokuba yi-refraction. Ukulungiswa kwephutha lokuzikhusela kufumaneka ngeiglasi, oonxibelelwano okanye ukuhlinzwa ngokutsha. Lo ngumbono wesisiseko somntu.
Iimpawu zoBuchule kunye neZiphutha zokuHlola
Ubuninzi bokubukeka ngumlinganiselo wokucaca nokubukhali kombono wakho. Ukulinganisa ubunqunu bakho obubonakalayo yindlela ekhawulezayo yokuqeqeshwa kwezempilo ukuze ufumane iingxaki zombono. Ubuninzi obubonakalayo obubonakalayo bubonakaliswa ngo-20/20 kwaye bubonisa iinkcukacha ezincinci umntu omele akwazi ukuzibona kumgama wokuhlola oqhelekileyo weenyawo ezingama-20. Iziphumo zokuvavanywa kwamathambo zinceda abaqeqeshi bezempilo ukuba banqume ukuba ungabonwa , ukhangele okanye ube ne- astigmatism .
Izinketho zokulungisa
Umbono unokulungiswa ngeendlela ezininzi. Iiglasi zamehlo ziphucula umbono ngokugoba ukukhanya. Zikhuselekile, zixhobo zokulungiswa koqoqosho. Olunye uluvo lokulungiswa komboniso luyi-lens zokuxhumana. Abantu abaneendlela zokuphila ezinomdla banandipha ukugqoka ii-lens zokudibanisa kuba bahlala endaweni engcono kunezibuko.
Utyando lokulungiso lenye indlela yokulungisa iingxaki zombono. Utyando lwe-refractive luphinde lusetyenzise iliso ukulungelelanisa ubuchule bokuguqa ukukhanya ukuze umgangatho wombono uphuculiswe ngaphandle kokusetyenziswa kwezixhobo zokubonelela ezongezelelweyo.
Iingxaki ezinxulumene nobudala
Njengoko sikhulile, amathuba okuphucula izimo kunye neengxaki zamehlo zanda.
Ukunciphisa ikhono lokugxila kwibala elikufutshane libizwa ngokuba yi- presbyopia , imeko eqhelekileyo ibonwa kubantu abangaphezu kwama-amane. Njengoko sikhulile, ngokukodwa kwiminyaka engamashumi amathandathu, i-lens yemvelo yeso liqala ukufumana imvula, imeko ebizwa ngokuba yi-cataract. Ngaloo tshintsho, isidingo sethu sokwandisa ukukhanya kunye nokutshintshana okubhetele ngakumbi. Ekugqibeleni, njengoko sineminyaka yobudala, umngcipheko wokwakha i-eye eye syndrome eyomileyo, ukubola kwe-macular kunye ne-cataract kakhulu.