Qhov Basic Classification Of Reading Glasses

Muaj peb hom kev nyeem ntawv tsom iav nyob rau hauv kev ua lag luam, uas yog tib lub lens, ob lub lens thiab cov lens loj heev. Tib lub lens tsuas yog siv los saib ze, koj yuav tsum tshem cov tsom iav thaum saib deb. Bifocals txhais tau hais tias sab sauv ib nrab ntawm lub lens yog siv los pom deb, ib nrab ntawm lub lens yog siv los saib ze, tab sis cov iav nyeem ntawv no muaj qhov tshwm sim dhia, thiab cov duab tsis zoo nkauj. Progressive multifocal tsom iav tuaj yeem ua tau raws li qhov xav tau ntawm qhov sib txawv ntawm qhov deb mus rau ze, thiab cov tsos kuj zoo heev, thiab cov koob npe nrov tau nce xyoo los ntawm xyoo 2019, thiab thawj tiam neeg muaj lub sijhawm hloov mus ntev dua.