Raws li kev kwv yees ntawm Lub Koom Haum Kev Noj Qab Haus Huv Ntiaj Teb (WHO), tus naj npawb ntawm cov neeg uas muaj mob myopia yogqhov loj tshaj plawsntawm cov neeg uas muaj qhov muag tsis zoo, thiabnws muajncav cuaged2.6 billion xyoo 2020. Myopia tau dhau los ua teeb meem loj thoob ntiaj teb, tshwj xeeb tshaj yog qhov hnyavnyob rau hauv teb chaws Es Xias. Tus nqi myopia hauv Suav teb yog 47.1%, yuav luag ib nrab ntawm tag nrho cov pej xeem.Nws txhais tau tias ibntawm txhua ob tus neeg pom kev ze.
Tus nqi Myopia hauv ntau lub tebchaws sib txawv
Niaj hnub nim no,nrogqhov kev nce ntxiv ntawm tus nqi myopia, tus nqi ntawmhnavcov tsom iav kuj tseem nce ntxiv txhua xyoo.Ua ib qho ntawm covpom kev tsis meejcov neeg mob, hakojtau ua tib zoo mloog rau qhov xwm txheejstias dexaus lubqhov zoo ntawm lub lens thaum xav txogqhov muagkev tsim qauv hnav thiab kev ua haujlwm ntawm lub lens?
Cia peb kawm ib yam dab tsitseem ceebt txog lubcov khoom siv lens thiab refractive index.
Ib lub lens zoo yuav tsum muaj kev sib npaug,kev xa musthiab kev meej meej. Tlub lens feem ntau niaj hnub no yog qhov tshwm sim ntawm ntau xyoo ntawm kev tshawb nrhiav.
| Kev tsim cov khoom siv lens Feem ntau ntawm cov iav thaum ub tau ua los ntawm tes nrog cov khoom siv ntuj xws li quartz thiab siv lead ua. Nrog rau kev txhim kho ntawm kev tsim iav thiab kev siv tshuab kev lag luam, cov khoom siv ntuj tau hloov pauv sai sai los ntawm iav kho qhov muag uas pib muab ntau yam haujlwm. Txij li xyoo 1960 txog 1980, cov ntaub ntawv resin, ua los ntawm roj av, tau hloov iav rau nws cov khoom siv kho qhov muag zoo dua, kev ua haujlwm zoo thiab cov khoom siv lub cev nyias, thiab dhau los ua cov khoom siv tseem ceeb ntawm cov iav tsom iav txog tam sim no. |
Raws li cov khoom siv lens nrov tshaj plaws hauv kev ua lag luam, cov ntaub ntawv resin feem ntau yog sawv cev los ntawm CR-39 resin tsim los ntawm PPG, MR resin tsim los ntawm Mitsui,thiabKR resin tsim los ntawm KOC, Kauslim Teb, thiab lwm yam.
Cov khoom siv lens txiav txim siab qhov refractive index ntawm lub lens. Lens refractive index yog qhov piv ntawm qhov ceev ntawm lub teeb kis hauv qhov chaw nqus tsev rau qhov ceev ntawm lub teeb kis hauv cov khoom siv lens, uas qhia txog lub peev xwm refraction ntawm lub lens rau lub teeb. Feem ntau, qhov siab dua qhov refractive index ntawm lub lens, qhov nyias dua lub lens.
Tam sim no,Ntiaj Teb Opticalmuaj qhov ntsuas refractive ntawm 1.50, 1.53, 1.56, 1.60, 1.67, 1.74 thiab lwm yamcov ntsuas ntawmlens. Hais txog cov ntaub ntawv, peb tau tswj hwm kev koom tes zoo nrog PPG ntawm Tebchaws Meskas thiab Mitsui Chemical ntawm Nyiv Poojib yam li ntawdlwm cov tuam txhab raw khoom nrog cov kev ua tiav zoo tshaj plaws.
CR-39 cov khoom siv raw yuav los ntawm PPG, Tebchaws USA, yog siv los ua cov iav refractive index 1.50.Nws nyiam dua hauv kev ua lag luam bvim nws cov Abbe coefficient siab, kev ua tau zoo heev ntawm qhov muag, kev ua tau zoo ntawm kev nyab xeebthiabpheej yig dua.
Lub lens 1.53 refractive index yog los ntawm cov khoom siv tshwj xeeb, Trivex, kuj los ntawm PPG hauv Tebchaws Meskas. Cov khoom siv lens Trivex yog qhov tiv taus kev cuam tshuam heev. Vim tias lawv sib dua li cov lens txheem, Trivex lenses yogzoo heevkev xaiv rau cov tsom iav menyuam yaus, cov tsom iav tsis muaj rim, cov tsom iav kis las, cov tsom iav kev nyab xeeb, thiab cov tsom iav kis las.
Nrog raukev loj hlob ntawmf tsom iav, lub "lens", ua lub ntsiab khoom siv ntawm tsom iav, yeej ib txwm tsim kho tshiab thiab txhim kho nrog kev hloov pauv ntawm lub sijhawm.Ntiaj tebKev pom kev zoo 1.60, 1.67, 1.74siabcov ntsuasCov khoom siv raw ntawm lub lens yog ua los ntawm MR series ntawm Mitsui ChemicalMR seriesyog cov khoom siv zoo thiab siab heev, nrog rau qhov ntsuas siab refractive, Abbe tus lej siab, qhov hnyav tshwj xeeb qis, kev cuam tshuam siab thiab lwm yam zoo.
Kev txhim kho tas mus li ntawm cov khoom siv lensKev Tshawb Fawb thiab Kev Txhim Khothiab thev naus laus zistxhawb nqacov khoom siv lensstsim kho tshiabionCov khoom siv raw ntawm lub lenstxiav txim siab qhovkev ruaj khovntawm qhov zoo, transmittance, clarity thiab visual effect.
Ntiaj teboptical tau ua raws li txoj cai ntawm kev sib koom tes yeej-yeej thiab kev sib koom tes ua tiavPebmloog lub suab ntawm cov neeg siv khoom,paubtus neeg siv khooms'xav tau, ua tib zoo saib xyuas kev ua lag luamkev nyiam, yog li ntawdlos tsim kom muaj lub zeem muag meej dua.