Tsis muaj kev txhawj xeeb - qhov tsis tau txhais hais tias koj yuav tsum hnav tsis zoo bifocals lossis trifocals. Rau cov neeg feem coob, kab-dawb cov lo ntsiab muag yog qhov kev xaiv zoo dua.
Lens progressive yog dab tsi?
Progressive lo ntsiab muag yog tsis muaj kab multifocal eyeglass lo ntsiab muag uas zoo ib yam li ib lub qhov muag tsis pom kev lo ntsiab muag. Hauv lwm lo lus, cov lo ntsiab muag ua tau zoo yuav pab koj pom meej ntawm txhua qhov kev ncua deb yam tsis muaj qhov cuam tshuam (thiab hnub nyoog txhais) "bifocal kab" uas pom nyob rau hauv ib txwm bifocals thiab trifocals.
Lub zog ntawm cov lo ntsiab muag zoo hloov maj mam los ntawm taw tes rau taw tes rau ntawm lub ntsej muag lub ntsej muag, muab lub hwj chim ntawm lub lens kom pom cov khoom kom pom tseeb ntawm qhov deb.
Bifocals, ntawm qhov tod tes, tsuas muaj ob lub lens lub zog - ib qho rau pom cov khoom nyob deb kom meej thiab lub zog thib ob hauv qab ib nrab ntawm lub lens kom pom meej ntawm qhov kev nyeem ntawv nyob deb. Qhov sib txuas ntawm cov cheeb tsam sib txawv ntawm lub zog no yog txhais los ntawm qhov pom "bifocal kab" uas txiav hla qhov nruab nrab ntawm lub lens.
Progressive lo ntsiab muag, qee zaum hu ua "no-line bifocals" vim tias lawv tsis muaj cov kab pom bifocal. Tab sis cov lo ntsiab muag ua tau zoo muaj qhov tsim tau zoo tshaj plaws multifocal ntau dua li bifocals lossis trifocals.
Hwm cov lo ntsiab muag zoo, feem ntau muab kev nplij siab thiab kev ua haujlwm zoo tshaj plaws, tab sis muaj ntau lwm hom thiab cov haujlwm ntxiv, xws li photochromic progressive lens, bluecut progressive lens thiab lwm yam, thiab ntau yam ntaub ntawv. Koj tuaj yeem nrhiav qhov tsim nyog rau koj tus kheej ntawm peb nplooj ntawvhttps://www.universeoptical.com/progressive-lenses-product/.
Cov neeg feem coob pib xav tau cov tsom iav qhov muag ntau zaus tom qab hnub nyoog 40 xyoo. Qhov no yog thaum qhov kev laus ib txwm hloov ntawm lub qhov muag hu ua presbyopia txo peb lub peev xwm kom pom tseeb ze ze. Rau txhua tus neeg uas muaj presbyopia, cov lo ntsiab muag muaj txiaj ntsig muaj txiaj ntsig zoo rau kev pom thiab kho kom zoo nkauj piv nrog cov tshuaj bifocals thiab trifocals.
Lub multifocal tsim ntawm cov lo ntsiab muag loj muaj cov txiaj ntsig tseem ceeb hauv qab no:
Nws muab lub zeem muag pom tseeb ntawm txhua qhov kev ncua deb (es tsis yog ntawm ob lossis peb qhov sib txawv saib qhov deb).
Nws tshem tawm qhov teeb meem "duab dhia" tshwm sim los ntawm bifocals thiab trifocals. Qhov no yog qhov uas cov khoom hloov pauv sai sai hauv qhov pom tseeb thiab qhov pom tseeb thaum koj ob lub qhov muag txav hla cov kab pom hauv cov lo ntsiab muag.
Vim tias tsis muaj cov "bifocals" pom nyob rau hauv cov lo ntsiab muag loj, lawv muab koj lub ntsej muag hluas dua li bifocals lossis trifocals. (Qhov no yog vim li cas ib leeg yuav yog vim li cas cov neeg niaj hnub no hnav lo ntsiab muag zoo dua li tus lej uas hnav bifocal thiab trifocals ua ke.)