Tsis txhob txhawj - qhov ntawd tsis tau txhais hais tias koj yuav tsum hnav cov tsom iav bifocals lossis trifocals uas tsis zoo. Rau cov neeg feem coob, cov tsom iav progressive uas tsis muaj kab yog qhov kev xaiv zoo dua.
Cov iav tsom iav nce qib yog dab tsi?
Cov tsom iav progressive yog cov tsom iav uas tsis muaj kab uas zoo ib yam li cov tsom iav ib leeg pom. Hauv lwm lo lus, cov tsom iav progressive yuav pab koj pom tseeb ntawm txhua qhov deb yam tsis muaj cov kab "bifocal" uas ua rau neeg ntxhov siab (thiab ua rau neeg laus) uas pom tau hauv cov tsom iav bifocal thiab trifocal ib txwm muaj.
Lub zog ntawm cov iav tsom iav hloov maj mam hloov ntawm ib qho mus rau ib qho ntawm qhov chaw ntawm lub iav tsom iav, muab lub zog ntawm lub iav tsom iav kom raug rau kev pom cov khoom kom meej meej ntawm txhua qhov deb.
Cov tsom iav ob sab (bifocals), ntawm qhov tod tes, tsuas muaj ob lub zog ntawm lub lens xwb - ib qho rau kev pom cov khoom nyob deb kom meej thiab lub zog thib ob hauv ib nrab qis ntawm lub lens rau kev pom kom meej ntawm qhov deb nyeem tau teev tseg. Qhov sib tshuam ntawm cov cheeb tsam muaj zog sib txawv no yog txhais los ntawm "kab bifocal" uas pom tau uas txiav hla nruab nrab ntawm lub lens.
Cov tsom iav progressive, qee zaum hu ua "tsis muaj kab bifocals" vim tias lawv tsis muaj kab bifocal pom tseeb no. Tab sis cov tsom iav progressive muaj kev tsim qauv multifocal zoo dua li cov tsom iav bifocals lossis trifocals.
Cov tsom iav zoo tshaj plaws, feem ntau muab kev nplij siab thiab kev ua tau zoo tshaj plaws, tab sis kuj muaj ntau lwm hom thiab lwm yam haujlwm ntxiv, xws li cov tsom iav photochromic, cov tsom iav bluecut thiab lwm yam, thiab ntau yam khoom siv. Koj tuaj yeem nrhiav tau ib qho uas haum rau koj tus kheej ntawm peb nplooj ntawvhttps://www.universeoptical.com/progressive-lenses-product/.
Feem ntau cov neeg pib xav tau tsom iav multifocal tom qab hnub nyoog 40 xyoo. Qhov no yog thaum qhov kev hloov pauv ntawm lub qhov muag uas hu ua presbyopia txo qis peb lub peev xwm pom tseeb thaum ze. Rau cov neeg uas muaj presbyopia, cov iav progressive muaj cov txiaj ntsig zoo rau kev pom thiab kev zoo nkauj piv rau cov tsom iav bifocals thiab trifocals ib txwm muaj.
Kev tsim cov iav tsom iav ntau lub qhov muag muaj cov txiaj ntsig tseem ceeb hauv qab no:
Nws muab kev pom tseeb ntawm txhua qhov deb (tsis yog ntawm ob lossis peb qhov deb sib txawv).
Nws tshem tawm qhov "dhia duab" uas ua rau muaj kev ntxhov siab los ntawm cov tsom iav bifocals thiab trifocals. Qhov no yog qhov uas cov khoom hloov pauv sai sai hauv qhov pom tseeb thiab qhov chaw pom tseeb thaum koj lub qhov muag txav mus hla cov kab pom hauv cov iav no.
Vim tias tsis muaj cov kab "bifocal lines" pom tseeb hauv cov iav tsom iav progressive, lawv ua rau koj zoo li hluas dua li cov iav tsom iav bifocals lossis trifocals. (Qhov laj thawj no ib leeg xwb tej zaum yog vim li cas ntau tus neeg niaj hnub no hnav cov iav tsom iav progressive dua li tus lej uas hnav bifocals thiab trifocals ua ke.)