Ukulungiswa kombukiso kubhekisela kwenye yezindlela ezimbalwa ezisetshenziselwa ukuthuthukisa umbono obonakele obangelwa iphutha lokubheka .
Kungani abanye abantu badinga ukulungiswa kwombono?
Abanye abantu badinga ukulungiswa kwombono ukuze kulungiswe iphutha lokucubungula. Iphutha lokuphikisa lenzeke lapho iso lingapheli ukukhanya ngokufanele (refract) njengoba lingena esweni, okwenza kube nesithombe esicacile. Kunezinkinga eziningana ezibandakanya iphutha lokuziphendulela.
Iziphi izibonelo zephutha lokuqeda?
Iphutha lokubheka, njengokubona okuncane noma ukubhekwa phambili , kwenzeka lapho isimo sesiso singavamile. Iso alikwazi ukugoba (noma ukuphikisa) ukukhanya kahle, ngakho umbono ubonakala. Ngokwemibandela elula, ukubhekwa kwe-closeyo (myopia) yisimo lapho amaphuzu okukhanya eqala ukugxila phambi kwe-retina. Ngomqondo othile, iso linamandla amabili. Ukuze unciphise le mandla ukuze amaphuzu okhanyayo agxile ngqo ku-retina, odokotela banquma ukungabi namalensi amancane noma amabi. Lapho amaphuzu okukhanya ewela ngqo kwi-retina, izithombe zicacile. Abantu abanokubona okubonakalayo bathambekela ekukhononda ngombono kube ngcono endaweni eseduze ne-blurrier eningi kude. Ukubhekwa ngokweqile (hyperopia) yisimo lapho amaphuzu okukhanya eqala ukugxila emuva kwe-retina. Ngenxa yalokho, iso alinamandla ngokwanele. Ukuze ubuke phambili, odokotela banquma noma ngaphezulu ama-lens amahle.
Ama-lens amaningi anika amandla amaningi iso ukuze amaphuzu okukhanya agxile ngqo kwi-retina. Abantu ababheke phambili bavame ukukhononda ukuthi umbono ubonakala endaweni eseduze kepha kude kakhulu. Uma ukusondela noma ukubheka phambili kufinyelela emalini aphakeme, wonke amabanga angaba incazelo ecacile kakhulu yalezi ziba yinto encane kakhulu.
I-Astigmatism yinye isibonelo sephutha elivamile lokuziphendulela. I-Astigmatism yinkimbinkimbi kakhudlwana ngokuthi kuyisifo esivame ukudukisa izithombe kunokuba nje kubonakale bebonakala befiphaza. Njengoba i-astigmatism, iso lingase libe negunya elilodwa ku-meridian eyodwa ne-90 degrees away, linamanye amandla. Ukuba ne-astigmatism ngokuvamile kusho ukuthi i-cornea, i-dome ecacile efana nesakhiwo phambi kweso, ifakwe njengobhola bebhola, kunokuba ibhasikidi. Noma kunjalo, umuntu angaba ne-astigmatism yangaphakathi evela ku-lens yangaphakathi leso. I-Astigmatism ibangela amaphuzu amabili okugxila angakafakwa ngqo kwi-retina. Lezi zici ezimbili zokugxila zingase zibe phambi kwe-retina, kokubili ngemuva kwe-retina noma eyodwa ngaphambili nangemuva kwe-retina. I-Astigmatism ingahle idideke kodwa ingabangela izimpawu eziningi kubandakanya umbono obonakalayo, umbono ophikisayo, umbono obusisiwe kanye nombono ophindwe kabili.
Izindlela ezivame kakhulu zokulungiswa kombono zigqoke izibuko noma ama-lens . Basiza ukufezekisa umbono ocacile ngokuphinda uvuselele imisebe yokukhanya ku- retina , inxephezela ukuma kweso.
Ukuhlinzwa okuqhubekayo kungenye indlela yokulungiswa kwombono. Ngesikhathi sokuhlinzwa okuqhubekayo, okufana ne- LASIK , ikhono lokugxila kweso lilungiswa ngokuphindaphinda i- cornea (ebusweni basohlo).