Abaninzi bethu banenhlanhla ngokwaneleyo ukuba bangafuneki izibuko ngenxa yobomi bethu bokuqala. Ngoko ngokukhawuleza, malunga no-40 ubudala, siqala ukufumana iingxaki ekujoliseni kuzo xa sizama ukufunda. Kubonakala ngathi ukuprintwa okuncinci kunzima kwaye kulukhuni ukufunda. Abantu abaninzi banomdla wokuba bekhulile. Ekuqaleni, ivakalelwa ngathi umbono wethu osondeleyo ukhankanywe okanye ukuphuthuma ukuba kwenzeke.
Amehlo ethu anokuziva ekhathele kwaye siba neentloko xa sizama ukufunda ixesha elide. Abanye abantu kufuneka babambe ifowuni yabo okanye enye idijithali esekelwe kude ukuba bakwazi ukuyibona. Njengoko inkqubela phambili emva kweminyaka engamashumi amane, kunokubonakala ngathi yonke into ngaphakathi kwimizi-ubude ibuhlungu kakhulu. Oku kuthiwa yi-presbyopia.
I-Presbyopia Yesiqhelo
I-Presbyopia ithintela kakhulu kakhulu. Le syndrome ibhekiselwa "njengengqondo engaphezulu kwama-40." Ewe, inxulumene nobudala, kodwa omnye akufanele abe nomuzwa wokuthi balahlekelwa yamehlo abo. I-Presbyopia yinkqubo eqhelekileyo. Amakhulu eminyaka edlulileyo, umyinge wokuphila wawungaphantsi kwama-40. Ngenxa yoko, i-presbyopia ayizange ibe yinkinga. Njengokuba ubomi bethu bemiyinge buye banda ukuya kwiminyaka engama-80 ubudala, i-presbyopia ibe yinkathazo yangempela echaphazela ubomi bethu bemihla ngemihla.
Iinguqu zenyama
I- cornea , icacileyo, isakhiwo esifana nesidanga esisekuqaleni kweso lethu, sinoxanduva malunga ne-75% yendlela yokukhanya ejolise kwi-retina yethu ukuze sikwazi ukubona imifanekiso ngokukhawuleza.
Nangona kunjalo, ngaphakathi kweso lethu i-crystalline lens, ehlala ngasemva kwe-iris, inxalenye yebala lethu. I- crystalline lens ibukeka njenge-lens yekhamera kwaye ixanduva malunga ne-25% yegunya lokugxila kwiso. Ivumela ukuba senze utshintsho oluncinane, olukhawulezayo nolushukumisayo kumandla ethu ekugxileni njengoko sibheka kude ukusuka kuyo kunye nayo yonke imida phakathi.
Isebenza ngokufana ne-auto-focus system kwiinkhamera. Kujikeleze i-lens ngumsizi obizwa nge-ciliary muscle. Ezi zivumelwano zesikhumba kwaye zibuyisela kwakhona, ukuvumela i-lens ukuba yolule ukuze ibe yincinci okanye iyancipha ukuze ibe yintsimbi phakathi. Ezi zintlukwano zivumela i-lens ukuba ishintshe isimo kwaye ibangele ukuguqulwa kwamandla onke kweso elingazigcina izinto ezigxilwe kuko sijonga kwizinto ezahlukeneyo.
Njengoko sikhula, utshintsho luyenzeka ngaphakathi kwilensi eyenza ukuba ilahlekelwe ukuguquguquka kwayo. Siphinde siphumelele ulawulo oluthile phezu komzimba womzimba we-ciliary kwaye luba lula kakhulu. Izazinzulu kunye noogqirha banomuvo wokudibanisa kwezi zinto zibini ezongeza kwaye zisenze sihlakulele i-presbyopia.
Isidingo samaGlasi
I-Presbyopia iqhubela phambili kwaye idala utshintsho olusondeleyo kumboniso wethu osondeleyo naphakathi kwimizuzu engama-40 ukuya kwi-60. Oku kuthetha ukuba sinokubona inguqu malunga ne-40 kunye neminyaka emibini, umboniso wethu osondeleyo ungabonakala ukonakala. Ngenxa yezi nguqulelo, ugqirha wakho wezilwanyana unokunikezela ngezixhobo ezahlukeneyo zokuvula ukuvumela ukuba ube nombono ontle, osebenzayo kufuphi nombono. Ezi zixhobo zingase zibe lula kubafundi be-counter-counter-counter, i-glass readings , i- bifocals , i-trifocals okanye akukho-line, iilensi eziqhubekayo.
Maxa wambi ama-lens adibana nawo angachazwa.
Abantu abaninzi bayeke ukuvakashela oogqirha beziliso ngenxa yokuba banomuzwa wokuthi "bayangena" kwaye "kuya kwenza ukuba amehlo am axhomekeke okanye ayenze ngakumbi xa ndigqoka iiglasi." Nangona ugqirha unokuthi uphumelele ekuphuhlisweni kweso luntu ngokumisela izixhobo ezingaphantsi kwe-7 ubudala, kubantu abadala, oku akuyi kwenzeka. Kubantu abadala, ukugqoka iilensi zokulungisa akuyi kubangela ubuthakathaka kombono womntu okanye benze ukuba baxhomekeke kubo. Ungasetyenziselwa ukucima umbono ukuze uqaphele ukuba impazamo enkulu kangakanani kwimibono echanekileyo neyiyo, kodwa iilensi zokulungisa ziza kunceda ukugxininisa ikhamera yakho.
Isidingo sokwandisa amandla okufunda iiglasi zonke iimbini zeeminyaka ziya kwenzeka kunye okanye ngaphandle kwee-lens zokulungisa kuba imeko ibuhlungu ngokwemvelo ukusuka kwiminyaka engama-40-60.
> Umthombo:
> UBenjamin, uWilliam J no-Irvin M. Borish. I-Borish's Clinical Refraction, ishicilelo sesibini, iTterworth-Heinemann-Elsevier, ngo-2006.