Magalasi a magalasi amawongolera zolakwika zowoneka bwino popinda (kubweza) kuwala pamene akudutsa mu mandala. Kuchuluka kwa mphamvu yopindika kuwala (mphamvu ya mandala) yomwe imafunika kuti munthu aziona bwino imasonyezedwa pamawu operekedwa ndi dokotala wanu wamaso.
Zolakwika zowoneka bwino komanso mphamvu zamagalasi zomwe zimafunikira kuti ziwongoleredwe zimayesedwa m'mayunitsi otchedwa dioptres (D). Ngati simuwona zam'tsogolo pang'ono, lens yanu ikhoza kunena -2.00 D. Ngati muli ndi myopia kwambiri, ikhoza kunena -8.00 D.
Ngati mukuwona kutali, muyenera ma lens "plus" (+), omwe ali okulirapo pakati komanso owonda m'mphepete.
Magalasi okhazikika kapena magalasi apulasitiki akusawona bwino kwambiri kapena kuyang'ana nthawi yayitali amatha kukhala okhuthala komanso olemetsa.
Mwamwayi, opanga apanga zida zatsopano za "high-index" zamapulasitiki zomwe zimapindika bwino.
Izi zikutanthawuza kuti zinthu zochepa zomwe zingagwiritsidwe ntchito mu lens yapamwamba kwambiri kuti ziwongolere zolakwika zomwezo, zomwe zimapangitsa kuti magalasi apulasitiki apamwamba akhale ochepa komanso opepuka kusiyana ndi magalasi wamba kapena magalasi apulasitiki.
Ubwino wa magalasi apamwamba kwambiri
Wochepa thupi
Chifukwa chakuti amatha kupindika bwino kuwala, magalasi apamwamba kwambiri owonera zam'tsogolo amakhala ndi m'mbali zoonda kuposa ma lens omwe ali ndi mphamvu yofananira yomwe amapangidwa ndi pulasitiki wamba.
Zopepuka
Mphepete zopyapyala zimafunikira zinthu zochepa zama lens, zomwe zimachepetsa kulemera konse kwa magalasi. Magalasi opangidwa ndi pulasitiki wapamwamba kwambiri ndi opepuka kuposa magalasi omwewo opangidwa ndi pulasitiki wamba, motero amakhala omasuka kuvala.
Ndipo magalasi ambiri apamwamba amakhalanso ndi mawonekedwe a aspheric, omwe amawapangitsa kukhala ocheperako, mawonekedwe owoneka bwino komanso amachepetsa mawonekedwe owoneka bwino omwe magalasi wamba amayambitsa muzolemba zamphamvu zowonera nthawi yayitali.
Zosankha zamagalasi apamwamba kwambiri
Magalasi apulasitiki apamwamba kwambiri tsopano akupezeka m'mitundu yosiyanasiyana ya refractive, nthawi zambiri kuyambira 1.60 mpaka 1.74. Magalasi okhala ndi refractive index ya 1.60 & 1.67 amatha kuonda ndi 20 peresenti kuposa magalasi apulasitiki wamba, ndipo 1.71 kapena kupitilira apo amatha kuchepera 50 peresenti.
Komanso, nthawi zambiri, index ndi yokwera, mtengo wa lens umakhala wokwera.
Dongosolo lanu la zowonera limatsimikiziranso mtundu wazinthu zomwe mungafune pamagalasi anu. Zolemba zapamwamba kwambiri zimagwiritsidwa ntchito makamaka pamankhwala amphamvu kwambiri.
Zambiri zamagalasi zodziwika bwino zamasiku ano - kuphatikiza Dual Aspheric, Progressive, Bluecut Pro, Prescription tonted, ndi magalasi opaka ma Spin-coating photochromic - amapezeka muzolemba zapamwamba kwambiri. Takulandilani kuti mudutse patsamba lathuhttps://www.universeoptical.com/armor-revolution-product/kuti muwone zambiri.