Raws li kev kwv yees ntawm World Health Organization (WHO), tus naj npawb ntawm cov neeg mob myopia yogqhov loj tshajntawm cov neeg uas muaj kev noj qab haus huv ob lub qhov muag, thiabnws muajncav cuaged2.6 billion hauv 2020. Myopia tau dhau los ua teeb meem loj thoob ntiaj teb, tshwj xeeb yog lojhauv Asia. Tus myopia tus nqi hauv Suav teb yog 47.1%, ze li ib nrab ntawm tag nrho cov pejxeem.Nws txhais tau tias ibtawm ntawm txhua ob tus neeg yog ze ze.
Myopia Rate nyob rau hauv txawv teb chaws
Niaj hnub no,nrogqhov tseem ceeb nce hauv myopia tus nqi, tus nqi ntawmhnavtsom iav kuj nce xyoo los ntawm xyoo.Raws li ib tug ntawm covmyopiccov neeg mob, hakoj vethem nyiaj rau qhov xwm txheejstas detxiav txim lublens zoo thaum xav txogqhov muaghnav tsim thiab lens muaj nuj nqi?
Cia peb kawm ib yamtseem ceebt o ib tuslens khoom thiab refractive index.
Lub lens zoo yuav tsum muaj qhov sib xws,kev xa tawmthiab clarity. Tnws feem ntau lo ntsiab muag niaj hnub no yog qhov tshwm sim ntawm xyoo ntawm kev tshawb nrhiav.
| Kev loj hlob ntawm cov ntaub ntawv lens Feem ntau ntawm cov lo ntsiab muag thaum ntxov tau ua los ntawm tes nrog cov ntaub ntawv ntuj xws li quartz thiab siv lead ua. Nrog rau kev tsim cov iav ntau lawm thiab kev lag luam thev naus laus zis, cov ntaub ntawv ntuj tau hloov pauv sai sai los ntawm cov iav kho qhov muag uas tau pib muab ntau lub zog. Txij xyoo 1960 mus txog xyoo 1980, cov ntaub ntawv cob, ua los ntawm cov roj av, tau hloov cov iav rau nws cov khoom kho qhov muag zoo dua, kev ua haujlwm nyab xeeb thiab nyias lub cev, thiab dhau los ua cov khoom tseem ceeb ntawm cov iav tsom iav kom txog rau tam sim no. |
Raws li cov khoom siv lo ntsiab muag nrov tshaj plaws nyob rau 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 cob tsim los ntawm KOC, Kauslim Teb, thiab lwm yam.
Cov khoom siv lens txiav txim siab qhov ntsuas qhov ntsuas ntawm lub lens. Lens refractive index yog qhov piv ntawm lub teeb propagation ceev nyob rau hauv lub tshuab nqus tsev mus rau lub teeb propagation ceev nyob rau hauv lub lens khoom, reflecting lub refraction muaj peev xwm ntawm lub lens rau lub teeb. Feem ntau hais lus, qhov siab dua qhov refractive index ntawm lub lens, qhov thinner lub lens.
Tam sim no,Lub ntiaj teb Opticalmuaj refractive index ntawm 1.50, 1.53, 1.56, 1.60, 1.67, 1.74 thiab lwm yamindexes ntawmlo ntsiab muag. Hais txog cov ntaub ntawv, peb tau tswj xyuas kev sib raug zoo nrog PPG ntawm Tebchaws Meskas thiab Mitsui Chemical ntawm Nyivzoo lilwm cov tuam txhab raw khoom nrog kev ua tiav zoo.
CR-39 raw khoom yuav los ntawm PPG, USA, yog siv los ua refractive index 1.50 lens.Nws yog ntau nyiam nyob rau hauv kev ua lag luam bvim nws siab Abbe coefficient, zoo heev optical kev ua tau zoo, kev nyab xeeb kev ua tau zoothiabraug nqi ntau dua.
Lub 1.53 refractive index lens yog muab los ntawm cov khoom tshwj xeeb, Trivex, kuj yog los ntawm PPG hauv Teb Chaws Asmeskas. Trivex lens khoom yog qhov cuam tshuam-resistant. Vim tias lawv sib zog dua li cov lo ntsiab muag, Trivex lo ntsiab muag yogzoo heevkev xaiv rau cov menyuam yaus cov tsom iav, cov looj tsom iav tsis muaj rimless, tsom iav ncaws pob, tsom iav kev nyab xeeb, thiab cov tsom iav kis las.
Nrog raukev loj hlob of tsom iav, lub "lens", raws li lub ntsiab accessory ntawm tsom iav, yog tas li innovating thiab upgrading nrog kev hloov ntawm lub sij hawm.ntugOptical 1.60, 1.671,74 ibsiabqhov ntsuasLens raw cov ntaub ntawv yog tsim los ntawm MR series ntawm Mitsui Chemical. MR seriesyog cov ntaub ntawv zoo thiab cov khoom siv siab heev, nrog cov kev ntsuas siab refractive, siab Abbe tus lej, tsis tshua muaj lub ntiajteb txawj nqus, siab cuam tshuam thiab lwm yam zoo.
Kev txhim kho tas mus li ntawm cov khoom siv lensR&Dthiab technologytxhawb nqacov khoom siv lensskev tsim kho tshiabion. Lens raw khoomtxiav txim qhovruaj khovntawm qhov zoo, transmittance, clarity thiab pom cov nyhuv.
ntugoptical tau ua raws li txoj cai ntawm kev sib tw yeej-yeej kev koom tes thiab kev sib koom ua tiav. Pebmloog cov neeg siv khoom lub suab,tau paubcov neeg siv khooms'xav tau, xyuam xim rau kev ua lag luamnyiam, zoo litsim kom muaj lub zeem muag pom tseeb.