Malinga ndi kuyerekezera kwa World Health Organisation (WHO), chiwerengero cha anthu omwe akudwala myopia ndichachikulupakati pa anthu okhala ndi maso ang'onoang'ono, ndizaterokufikiraed2.6 biliyoni mu 2020. Myopia yakhala vuto lalikulu padziko lonse lapansi, makamaka kwambiriku Asia.Chiwerengero cha myopia ku China ndi 47.1%, pafupifupi theka la anthu onse.Amatanthauza chimodzimwa anthu awiri aliwonse ndi openya.
Mlingo wa Myopia M'maiko Osiyana
Masiku ano,ndikuwonjezeka kwakukulu kwa myopia, mlingo wakuvalamagalasi nawonso akuwonjezeka chaka ndi chaka.Monga mmodzi wamyopicodwala,have inuanatchera khutu ku chinthuchoskuti dekumaliza thekhalidwe la lens poganiziradisokuvala kapangidwe ndi ntchito ya lens?
Tiyeni tiphunzirepo kanthuchofunikat za ndiLens material ndi refractive index.
Lens yabwino imafuna kufanana,kutumizandi kumveka.Tmandala ambiri masiku ano ndi zotsatira za zaka za kufufuza.
| Kukula kwa zida zamagalasi Magalasi ambiri akale kwambiri adapangidwa ndi manja ndi zinthu zachilengedwe monga quartz ndi kristalo.Ndi chitukuko cha kupanga magalasi ndi teknoloji ya mafakitale, zipangizo zachilengedwe zinasinthidwa mwamsanga ndi galasi la kuwala lomwe linayamba kupereka ntchito zambiri.Kuyambira m'ma 1960 mpaka 1980s, zida za utomoni, zopangidwa kuchokera ku mafuta, zasintha magalasi chifukwa cha mawonekedwe ake owoneka bwino, otetezedwa bwino komanso mawonekedwe ake opyapyala, ndikukhala zinthu zazikulu zamagalasi amaso mpaka pano. |
Monga zida zodziwika bwino zamagalasi pamsika, zida zama utomoni zimayimiridwa makamaka ndi utomoni wa CR-39 wopangidwa ndi PPG, utomoni wa MR wopangidwa ndi Mitsui,ndiKR resin yopangidwa ndi KOC, Korea, etc.
Zida zamagalasi zimatsimikizira index ya refractive ya mandala.Lens refractive index ndi chiŵerengero cha liwiro la kufalikira kwa kuwala mu vacuum ndi liwiro la kufalikira kwa kuwala muzinthu za lens, kuwonetsa kuthekera kwa kuwala kwa mandala kuti awala.Nthawi zambiri, kuchuluka kwa refractive index ya mandala kumachepa kwambiri.
Pakadali pano,Universe Opticalali ndi refractive index ya 1.50, 1.53, 1.56, 1.60, 1.67, 1.74 ndi enaindexes zamagalasi.Pankhani ya zida, takhala tikugwirizana kwambiri ndi PPG yaku United States ndi Mitsui Chemical waku Japan.komansomakampani ena opangira zida zopambana zopambana kwambiri.
CR-39 zida zogulidwa ku PPG, USA, zimagwiritsidwa ntchito kupanga refractive index 1.50 lens.Zimakondedwa kwambiri pamsika bchifukwa cha kuchuluka kwake kwa Abbe, magwiridwe antchito abwino kwambiri, magwiridwe antchito achitetezondizotsika mtengo.
Lens ya 1.53 refractive index imachokera ku zinthu zapadera, Trivex, komanso kuchokera ku PPG ku US.Zida zamagalasi a Trivex ndizosagwira ntchito kwambiri.Chifukwa ndi opepuka kuposa magalasi wamba, magalasi a Trivex alizabwino kwambirikusankha zovala zamaso za ana, zovala zamaso zopanda rimless, magalasi amasewera, zodzitchinjiriza ndi maso othamanga.
Ndichitukuko of magalasi, "lens", monga chowonjezera chachikulu cha magalasi, nthawi zonse imapanga zatsopano ndikusintha ndi kusintha kwa nthawi.ChilengedweOptical 1.60, 1.67, 1,74apamwambaindexZopangira ma lens zimapangidwa kuchokera ku MR mndandanda wa Mitsui Chemical.MR mndandandandi zida zapamwamba komanso zapamwamba, zokhala ndi index yotsika kwambiri, nambala yayikulu ya Abbe, mphamvu yokoka yotsika, kukana kwakukulu ndi zabwino zina.
Kuwongolera kosalekeza kwa zinthu zama lensR&Dndi lusokuwonjezeramandala mankhwalasnzeruion.The zipangizo magalasikudziwabataza khalidwe, transmittance, momveka bwino komanso zowoneka bwino.
ChilengedweOptical wakhala akutsatira ndondomeko ya mgwirizano wopambana-kupambana ndi kupindula pamodzi.Ifemverani mawu a makasitomala,kudziwakasitomalas'zosowa, tcherani khutu kumsikachizolowezi, kutikuti apange masomphenya omveka bwino.