Kunezigaba ezi-4 eziyinhloko zokulungiswa kombono—i-emmetropia, i-myopia, i-hyperopia, ne-astigmatism.
I-Emmetropia umbono ophelele. Iso selivele likhipha ukukhanya ku-retina futhi alidingi ukulungiswa kwezibuko.
I-Myopia yaziwa kakhulu ngokuthi ukubona eduze. Kwenzeka lapho iso lilide kancane, okuholela ekukhanyeni okugxile phambi kwe-retina.
Ukuze ulungise i-myopia, udokotela wakho wamehlo uzokunikeza amalensi okukhipha (-X.XX). Le lensi yokukhipha isunduza iphuzu lokugxila emuva ukuze liqondaniswe kahle ku-retina.
I-Myopia iyindlela evame kakhulu yephutha lokuphikisa emphakathini wanamuhla. Eqinisweni, kucatshangwa ukuthi ubhubhane lomhlaba wonke, njengoba bayanda abantu abatholakala benale nkinga minyaka yonke.
Laba bantu bangabona kahle eduze, kodwa izinto ezikude zibonakala zilufifi.
Ezinganeni, ungase ubone ukuthi ingane inenkinga yokufunda ibhodi esikoleni, ibamba izinto zokufunda (omakhalekhukhwini, izincwadi, ama-iPads, njll.) isondelene ngokungavamile nobuso bayo, ihlezi eduze kakhulu nomabonakude ngoba “azikwazi. bona”, noma ngisho nokucikica amehlo kakhulu.
I-Hyperopia, ngakolunye uhlangothi, yenzeka lapho umuntu ekwazi ukubona kude, kodwa angase abe nobunzima bokubona izinto eduze.
Ezinye zezikhalazo ezivame kakhulu ngama-hyperopes empeleni akukhona ukuthi ababoni, kodwa kunalokho ukuthi baphathwa yikhanda ngemva kokufunda noma ukwenza umsebenzi wekhompyutha, noma ukuthi amehlo abo avame ukuzizwa ekhathele noma ekhathele.
I-Hyperopia yenzeka lapho iso lifushane kakhulu. Ngakho-ke, ukukhanya kugxile kancane ngemuva kwe-retina.
Ngokubona okuvamile, isithombe sigxile kakhulu phezu kwe-retina. Ekuboneni kude (hyperopia), i-cornea yakho ayikufihli ukukhanya ngendlela efanele, ngakho iphuzu lokugxila liwela ngemuva kwe-retina. Lokhu kwenza izinto ezisondelene zibonakale zilufifi.
Ukuze ulungise i-hyperopia, odokotela bamehlo banquma amalensi ahlanganisa (+X.XX) ukuze alethe iphuzu lokugxila phambili ukuze lihlale kahle ku-retina.
I-Astigmatism ingesinye isihloko esiphelele. I-Astigmatism yenzeka lapho ingaphezulu leso (i-cornea) lingeyindilinga ngokuphelele.
Cabanga nge-cornea evamile efana ne-basketball enqunywe phakathi. Iyindilinga ephelele futhi iyalingana kuzo zonke izinhlangothi.
I-cornea ye-astigmatic ibukeka njengeqanda elibilisiwe elinqunywe phakathi. I-meridian eyodwa yinde kunomunye.
Ukuba nama-meridians anomumo amabili ahlukene kubangela amaphuzu amabili ahlukene okugxilwa kuwo. Ngakho-ke, i-lens yengilazi idinga ukwenziwa ukulungisa kokubili ama-meridians. Lesi sidakamizwa sizoba nezinombolo ezimbili. Isibonelo-1.00 -0.50 X 180.
Inombolo yokuqala isho amandla adingekayo ukuze kulungiswe i-meridian eyodwa kanti inombolo yesibili isho amandla adingekayo ukuze kulungiswe enye i-meridian. Inombolo yesithathu (X 180) imane isho ukuthi ama-meridians amabili alele kuphi (angasukela ku-0 kuye ku-180).
Amehlo anjengemigqa yeminwe—awekho amabili afana ncamashi. Sifuna ukuthi ubone okungcono kakhulu kwakho, ngakho-ke ngezinhlobonhlobo ezinothile zokukhiqizwa kwamalensi singasebenza ndawonye ukuze sithole isixazululo esiphelele sokuhlangabezana nezidingo zakho ngazinye.
I-Universe inganikeza amalensi angcono ukulungisa izinkinga zamehlo ezingenhla. Pls sigxile emikhiqizweni yethu:www.universeoptical.com/products/