Kunezinhlobo ezine eziyinhloko zokulungiswa kokubona—i-emmetropia, i-myopia, i-hyperopia, kanye ne-astigmatism.
I-Emmetropia ukubona okuphelele. Iso selivele libuyisela ukukhanya ku-retina futhi alidingi ukulungiswa kwezibuko.
I-Myopia yaziwa kakhulu ngokuthi ukubona eduze. Kwenzeka uma iso lide kakhulu, okuholela ekukhanyeni okugxile phambi kwe-retina.
Ukuze kulungiswe i-myopia, udokotela wakho wamehlo uzokunikeza ama-lens amancane (-X.XX). Lawa ma-lens amancane asunduza iphuzu lokugxila emuva ukuze lihambisane kahle ne-retina.
I-Myopia iyindlela evame kakhulu yokuphambuka kokubona emphakathini wanamuhla. Eqinisweni, empeleni kucatshangwa ukuthi iyimbangela yomhlaba wonke, njengoba abantu abaningi ngokwengeziwe betholakala benale nkinga minyaka yonke.
Laba bantu bangabona kahle kakhulu eduze, kodwa izinto ezikude zibonakala zingacacile.
Ezinganeni, ungase uqaphele ukuthi ingane inenkinga yokufunda ibhodi esikoleni, iphethe izinto zokufunda (omakhalekhukhwini, izincwadi, ama-iPad, njll.) eduze kobuso bayo ngendlela engavamile, ihlezi eduze kakhulu ne-TV ngoba “ayiboni”, noma ibuka amehlo noma iwahlikihla kakhulu.
Ngakolunye uhlangothi, i-hyperopia yenzeka lapho umuntu ekwazi ukubona kude kakhulu, kodwa angase abe nesikhathi esinzima sokubona izinto eduze.
Ezinye zezikhalazo ezivame kakhulu ngama-hyperopes empeleni akukhona ukuthi awaboni, kodwa kunalokho ukuthi aphathwa yikhanda ngemva kokufunda noma ukwenza umsebenzi wekhompyutha, noma ukuthi amehlo awo avame ukuzizwa ekhathele noma ekhathele.
I-Hyperopia yenzeka lapho iso lifushane kakhulu. Ngakho-ke, ukukhanya kugxile kancane ngemuva kwe-retina.
Uma ubona kahle, isithombe sigxila kakhulu ebusweni be-retina. Uma ubona kude (hyperopia), i-cornea yakho ayikukhanyisi kahle ukukhanya, ngakho-ke iphuzu lokugxila liwela ngemuva kwe-retina. Lokhu kwenza izinto eziseduze zibonakale zingacacile.
Ukuze kulungiswe i-hyperopia, odokotela bamehlo banikeza amalensi e-plus (+X.XX) ukuze baqondise indawo yokugxila kahle ku-retina.
I-Astigmatism iyinto ehlukile ngokuphelele. I-Astigmatism yenzeka lapho ubuso obungaphambili beso (i-cornea) bungesiyindilinga ngokuphelele.
Cabanga nge-cornea evamile efana ne-basketball esikwe phakathi. Iyindilinga ephelele futhi ilingana kuzo zonke izinhlangothi.
I-cornea e-astigmatic ibukeka njengeqanda elibilisiwe elisikwe phakathi. I-meridian eyodwa inde kunenye.
Ukuba nama-meridian amabili anesimo esihlukile esweni kuholela ezindaweni ezimbili ezihlukene zokugxila. Ngakho-ke, kudingeka kwenziwe ilensi yengilazi ukuze ilungele womabili ama-meridian. Lo muthi uzoba nezinombolo ezimbili. Isibonelo - 1.00 -0.50 X 180.
Inombolo yokuqala imelela amandla adingekayo ukulungisa i-meridian eyodwa kanti inombolo yesibili imelela amandla adingekayo ukulungisa enye i-meridian. Inombolo yesithathu (X 180) imane isho ukuthi ama-meridian amabili alele kuphi (angasukela ku-0 kuya ku-180).
Amehlo afana neminwe—awekho afana ncamashi. Sifuna ubone okuhle kakhulu kuwe, ngakho-ke ngezinhlobonhlobo zokukhiqiza amalensi singasebenzisana ukuthola ikhambi eliphelele lokuhlangabezana nezidingo zakho.
I-Universe inganikeza amalensi angcono okulungisa izinkinga zamehlo ezingenhla. Sicela ugxile emikhiqizweni yethu:www.universeoptical.com/products/