Kev siv hluav taws xob tshwj xeeb yog qhov tsis zoo los ntawm kev khoov (ua kom zoo dua) lub teeb thaum uas nws dhau ntawm lub lens. Qhov ntau ntawm lub teeb-khoov muaj peev xwm (lens fais fab) uas xav tau los muab lub zeem muag zoo yog qhia rau ntawm lub tsom kwm tsom rau los ntawm koj tus kws kho mob saib xyuas.
Defractive qhov yuam kev thiab lens lub hwj chim yuav tsum kho lawv yog ntsuas hauv cov koog hu ua Dioptres (D). Yog tias koj tsis tshua muaj zog me me, koj lub lens tshuaj yuav hais -2.00 d. Yog tias koj yog myopic heev, nws yuav hais -8.00 d.
Yog tias koj tau xav tau ntev, koj xav tau "ntxiv" (+) lo ntsiab muag, uas yog tuab dua hauv nruab nrab thiab thinner ntawm ntug.
Lub iav li niaj zaus lossis cov lo ntsiab muag yas rau cov nyiaj ntau ntawm kev luv luv lossis kev pom ntev ntev tuaj yeem yog tuab thiab hnyav.
Hmoov zoo, cov manufacturers tau tsim ntau yam tshiab "High-Performance index" yas lens cov ntaub ntawv uas khoov lub teeb ntau dua.
Qhov no txhais tau tias cov khoom siv tsawg tuaj yeem siv rau hauv cov teeb meem loj kom kho tau tus nqi qub, uas ua rau muaj kev ua tsis ncaj ncees ob qho tib si thinner thiab sib zog dua iav lossis cov ntsiab muag yas.
Qhov zoo ntawm cov teeb meem siab-index
Lub tshuab nqus
Vim tias lawv muaj peev xwm khoov lub teeb ua kom zoo dua, cov qauv siab tshaj plaws rau cov khoom siv yas uas muaj cov khoom siv yas.
Lub ntais txhuam
Thinner cov npoo yuav tsum muaj cov ntaub ntawv lens tsawg dua, uas txo cov txheej txheem hnyav tag nrho ntawm cov lo ntsiab muag. Cov ntsiab muag tau ua los ntawm cov txheej txheem hluav taws xob siab yog sib dua dua li cov lo ntsiab muag sib txawv ua hauv cov roj hmab uas muaj kuab yooj yim, yog li lawv nyiam hnav.
Thiab feem ntau cov kev ntsuas siab tseem muaj qhov tsim qauv zoo nkauj, uas muab ib qho zoo nkauj tshaj plaws uas tau txo tus lenses uas pom zoo heev uas ua rau muaj cov tshuaj ruaj khov.
High-Performance index log xaiv
High-Performance index cov ntsiab muag yas yog tam sim no muaj nyob rau hauv ntau ntawm cov khoom lag luam tsis tu ncua, feem ntau xws li los ntawm 1.60 mus rau 1.74. Lo ntsiab muag nrog lub ntsuas hluav taws xob ua haujlwm ntawm 1.60 & 1.67 yuav tsawg kawg 20 feem pua ntawm cov hnab yas lo ntsiab muag yas, thiab 1.71 lossis siab dua feem ntau tuaj yeem nyob ib ncig ntawm 50 feem pua thinner.
Tsis tas li, feem ntau hais lus, qib siab dua yog, ntau dua lo ntsiab muag tau nqi.
Koj cov ntaub ntawv tsom kwm kuj txiav txim seb cov khoom siv ntsuas siab uas koj yuav xav tau rau koj lub lens. Cov ntaub ntawv siab tshaj plaws yog siv rau cov tshuaj muaj zog tshaj plaws.
Feem ntau ntawm cov lens nrov niaj hnub no tsim thiab nta - suav nrog dua ob lub ntsej muag, thiab tam sim no los ntawm cov duab ci-ating, thiab muaj nyob rau hauv cov ntaub ntawv ntsuas siab. Txais tos kom nyem rau hauv peb nplooj ntawv rauhttps://www.univiantoptical.com/armor-revolution-product/Txheeb xyuas cov ntsiab lus ntxiv.