Ukujiya kwamalensi ezingilazini kuthonywa izici eziningi, phakathi kwazo amandla amalensi ayisici esiyinhloko.Ugqinsi lweLens lwe-Myopia Ephakeme lujiyile kunalolo lwe-Myopia ephansi.Kodwa-ke, uma kukhulunywa ngogqinsi lulonke, ububanzi beLens bubalulekile, futhi ukukhetha uhlaka oluncane kunganciphisa kakhulu ukujiya kweLens.Ukuma kwe-Lens nakho kubalulekile, njenge-Myopia engxenyeni ewugqinsi ye-peripheral ye-Concave Lens, i-Hyperopia engxenyeni emaphakathi ye-Convex Lens kanye ne-peripheral ezacile.
Inkomba ye-refractive (Juni 20) yelensi iyisici esibucayi futhi isici esivumela isiguli ukuthi silawule ukushuba kweLens.Inkomba ye-Refractive isilinganiso senani lapho ukukhanya kudlula endaweni ethile (njengengilazi, amanzi, ipulasitiki, umoya) kuya kusilinganiso sakho endaweni engenalutho.Ukuphakama kwenkomba ye-refractive, kwehla izinga lokudlulisa ukukhanya phakathi nendawo, futhi kuba sobala kakhulu ukuphindaphinda kokukhanya.Ngakho-ke, ilensi enenkomba ephezulu ye-refractive ihlanza ukukhanya ngokuphumelelayo futhi ngenxa yalokho izacile kunelensi enenkomba ephansi ye-refractive.
Sekungamakhulu eminyaka izingilazi zenziwe ngengilazi, futhi ezinye iziguli zisaphikelela kumalensi engilazi ngoba zinomuzwa wokuthi zinikeza ikhwalithi yokubukwa engcono kakhulu.Amalensi engilazi esimanje enziwe nge-Crown Glass, into enokuhlukahluka okuphansi kwe-chromatic kanye nokumelana nokunwaya.I-Crown Glass inenkomba ephezulu ye-refractive, ephakeme kakhulu kunaleyo yamalensi amaningi epulasitiki.Kodwa-ke, ngenxa yokuminyana kwayo okuphezulu, ingilazi yomqhele isinda kakhulu kunamalensi epulasitiki anenkomba efanayo ye-refractive, nakuba amalensi epulasitiki avamise ukuba mkhulu.Iziguli zivame ukukhetha amalensi alula, yingakho zikhetha amalensi epulasitiki ngaphezu kwengilazi yomqhele.
I-Standard Plastic yezibuko zozimele yi-Columbia Resin-39(CR-39) .Lena into enhle yelensi, ayikwazi nokuklwebheka, futhi inesisindo esiwuhhafu kuphela njengelensi yengilazi efanayo.Kodwa-ke, inkomba yayo ephansi ye-refractive isho ukuthi i-Lens iwugqinsi uma yenziwa izibuko ze-high-diopter.
Izinhlobonhlobo zezinto ezisetshenziswayo zamalensi epulasitiki sezenziwe, okuholele ekutheni kube nenkomba ephezulu ye-refractive kodwa izacile, amalensi alula.Okufana ne-polycarbonate (1.586), i-polyurethane (1.595) kanye nengilazi yezinto ezikhethekile (1.70).Lawa ma-lens awekho aminyene kunezinye iziguli ezine-myopic, kuyilapho enikeza inani eliphakeme lamadigri obude.Kodwa-ke, ezinye zalezi zinsiza zinokuphambuka okukhulu kunezikhombo eziphansi ze-refractive futhi azibekezeleleki kalula.Eziningi zalezi zinto zithambile, azikwazi ukuphuka kunengilazi noma ipulasitiki ye-CR-39, kodwa ijwayele ukuklwebheka.
Isikhathi sokuthumela: Jul-28-2021