Malinga ndi kuyerekezera kwa World Health Organisation (omwe), kuchuluka kwa anthu omwe ali ndi Myopia ndichachikulumwa anthu omwe ali ndi maso azachipatala, ndipoZilifikaed2.6 biliyoni mu 2020. Myopia wakhala vuto lalikulu lapadziko lonse lapansi, makamaka kwambiriKu Asia. Mlingo wa myopia ku China ndi 47.1%, pafupifupi theka la anthu onse.Amatanthauza imodziMwa anthu awiri aliwonse amalimba.
Chiwerengero cha Myopia m'maiko osiyanasiyana
Masiku ano,ndikuwonjezeka kwakukulu kwa myopia, kuchuluka kwakuvalaMagalasi amawonjezekanso chaka ndi chaka.Ngati m'modzi wamyficodwala, Haveanalipira chifukwa chotsatiraskuti deamateroMzindawu ukamaganiziradisokuvala kapangidwe ndi mandala?
Tiyeni tiphunzire kenakugulitsat pafupi alens nkhani zakuthupi komanso zonena.
Maukwati abwino amafunika kufanana,kulunjikandi kumveka bwino. TMa lens ambiri masiku ano ndi chifukwa cha kuchuluka kwa zaka.
| Kukula kwa zinthu za Lens Ambiri mwa mandala oyambirira adapangidwa ndi dzanja ndi zida zachilengedwe monga quartz ndi kristalo. Ndi chitukuko cha groeprection wopanga ndi ukadaulo wambiri, zinthu zachilengedwe zinasinthidwa mwachangu ndi galasi lokondedwa lomwe linayamba kugwira ntchito zambiri. Kuyambira mu 1960 mpaka 198s, zolengedwa, zopangidwa kuchokera ku mafuta, zopangidwa kuchokera ku mafuta, zokhala ndi zotetezeka komanso zopyapyala zamiyala, ndikukhala nkhani zazikulu za magalasi a eyegoclass mpaka pano. |
Monga ma lens otchuka kwambiri pamsika, zinthu zokhala zikuyimiriridwa makamaka ndi Cr-39 zomwe zapangidwa ndi PPG, Mr Restin adapangidwa ndi Mitsui,ndiKr Slin adapangidwa ndi KOC, Korea, etc.
Zinthu za mandala zimatsimikizira mndandanda wa mandala. Mndandanda wowoneka bwino ndi gawo la liwiro la Kuthamanga mu vacuum ku Fluumuum kupita ku liwiro la ma lens, kuwonetsera luso lokonzanso zamiyala. Nthawi zambiri, mndandanda wapamwamba wa mandala, wowonda mandala.
Pakadali pano,UNICRAR CARDili ndi mndandanda wonena za 1.50, 1.533, 1.56, 1.60, 1.67, 1.74 ndi enaindexs wamagalasi. Pazolinga za zida, takhala tikugwirizana kwambiri ndi PPG ya United States ndi Mitsui Chemical of JapankomansoMakampani ena opangira zinthu omwe ali ndi zinthu zabwino kwambiri.
CR-39 zopangira zogulidwa kuchokera pa PPG, USA, imagwiritsidwa ntchito popanga index 1.50 mandala.Imakondedwa mu msika bKutuluka kwa ntchito yake yokwanira, magwiridwe antchito abwino kwambiri, magwiridwe antchitondiokwera mtengo kwambiri.
Ma lens a 1.53 obweranso amachokera ku zinthu zapadera, trivex, komanso kuchokera ku PPG ku US. Zinthu za Trifx Lens ndizokhudza kwambiri. Chifukwa ndi opepuka kuposa magalasi okwanira, magalasi a trivex alizabwino kwambiriKusankha kwa Hyewear ya ana a ana, yosasangalatsa, masewera am'masewera, chitetezo cham'maso, ndi masewera othamanga.
Ndichitukuko oMagalasi a F al, "mandala", ndiye kuti gawo lalikulu la magalasi, limakhala lofananira ndi kusinthana nthawi zina.Dziku lonseOptical 1.60, 1.67, 1.74m'mwambamapetoZojambula za LEns zimapangidwa ndi mndandanda wa Mitsui mankhwala. MR mndandandaNdi zida zapamwamba komanso zapamwamba, zokhala ndi nambala yayikulu yotsika, nambala yayikulu ya Abbe, mphamvu yotsika kwambiri, kukana mphamvu ndi maubwino ena.
Kusintha kosalekeza kwa ma lensR & dndi ukadauloKwezaniZogulitsa za Lonswosadwalaioni. Zojambula za mandalaDziwanibatakwa mtundu, kutumiza, kumveka komanso kuwoneka.
Dziku lonseomsical wakhala akutsatira ndondomeko ya win-yopambana ndi kukwaniritsa. IfeMverani mawu a makasitomala,Dziwanimgulis'zosowa, samalani pamsikakufuna, mongakupanga masomphenya owoneka bwino.