Kunezigaba ezi-4 eziphambili zokulungiswa kokubona-emmetropia, i-Myopia, i-Hyperopia, kanye ne-astigmatism.
I-Emmetropia umbono omuhle. Iso livele selivele liyakhanya ngokuphelele ku-retina futhi alidingi ukulungiswa kwengilazi.
I-Myopia yaziwa kakhulu ngokubona eduze. Kwenzeka lapho iso lide kakhulu, okuphumela ekukhanyeni okugxile phambi kwe-retina.
Ukuze ulungise i-Myopia, udokotela wakho wamehlo azonqunywa ama-lens anus (-x.xx). Lens yokususa lens icindezela iphuzu lokugxila emuva ukuze livumelane kahle ne-retina.
I-Myopia yindlela evame kakhulu yephutha lokudishaka emphakathini wanamuhla. Eqinisweni, empeleni kucatshangwa ukuthi ubhubhane lomhlaba wonke, njengoba iningi labantu litholakala nalolu nkinga minyaka yonke.
Lababantu bangabona kakhulu eduze, kepha izinto ezikude zibonakala zifiphele.
Ezinganeni, ungahle uqaphele ukuthi ingane enobunzima bokufunda ibhodi esikoleni, ibambe izinto zokufunda (omakhalekhukhwini, izincwadi, ama-iPads, njll.)
IHyperopia, ngakolunye uhlangothi, kwenzeka lapho umuntu ebona kude, kodwa angaba nobunzima bokubona izinto zisondele.
Ezinye zezikhalazo ezivame kakhulu ngama-hyperopes empeleni azizi ukuthi aziboni, kepha esikhundleni salokho zithola ikhanda ngemuva kokufunda noma ukwenza umsebenzi wekhompyutha, noma ukuthi amehlo abo ahlala ediniwe noma ekhathazekile.
IHyperopia yenzeka lapho iso lifushane kakhulu. Ngakho-ke, ukukhanya okugxile kancane ngemuva kwe-retina.
Ngombono ojwayelekile, isithombe sigxile kakhulu ebusweni be-retina. Ngokungakubi (i-hyperopia), i-cornea yakho ayivumeli kahle, ngakho-ke iphuzu lokugxila liwela ngemuva kwe-retina. Lokhu kwenza izinto ezisondelene nazo zibonakale zifiphele.
Ukulungisa i-hyperopia, odokotela bamehlo banquma ama-lens (+ x.xx) lens (+ x.xx) lens (+ x.xx) lens ukuletha iphuzu lokugxila phambili emhlabeni ngendlela efanele ku-retina.
I-Astigmatism iyisihloko sonke. I-astigmatism yenzeka lapho ingaphezulu elingaphambili leso (i-cornea) alindizeki kahle.
Cabanga nge-cornea ejwayelekile ebukeka njenge-basketball enqunywe ngesigamu. Kuyindilinga ephelele futhi ilingana kuzo zonke izinkomba.
I-astigmatic cornea ibukeka njengeqanda elibilisiwe elisikiwe ngesigamu. I-meridian eyodwa isikhathi eside kunenye.
Ukuba nabalingani ababili abahlukene ababunjiwe bamehlo kuphumela kumaphuzu amabili ahlukile wokugxila. Ngakho-ke, amalensi ezingilazi adinga ukwenziwa ukuze alungise bobabili ama-Meridians. Lo mbhalo uzoba nezinombolo ezimbili. Isibonelo-1.00 -0.50 x 180.
Inombolo yokuqala isho amandla adingekayo ukulungisa i-meridia eyodwa ngenkathi inombolo yesibili isho amandla adingekayo ukulungisa omunye uMeridian. Inombolo yesithathu (x 180) imane isho lapho ama-meridian amabili elele khona (angahluka kusuka ku-0 kuye ku-180).
Amehlo afana nama-prints eminwe - akukho amabili afanayo. Sifuna ubone okungcono kakhulu, ngakho-ke ngezinhlobonhlobo zokukhiqiza ama-lens esingasebenzisana ukuthola isixazululo esifanele ukuze sihlangabezane nezidingo zakho.
Umkhathi unganikeza amalensi angcono ukulungisa izinkinga ezingenhla ze-opthalmic. Pls Gxila emikhiqizweni yethu:www.univoptical.com/products/