Thaum koj nkag mus rau hauv lub khw muag tsom iav thiab sim yuav ib khub tsom iav, koj muaj ntau hom kev xaiv tsom iav nyob ntawm koj daim ntawv yuav tshuaj. Tab sis ntau tus neeg tsis meej pem los ntawm cov lus pom ib zaug, ob lub qhov muag ob sab thiab kev nce qib. Cov lus no hais txog seb cov tsom iav hauv koj daim ntawv yuav tshuaj tau tsim li cas. Tab sis yog tias koj tsis paub meej tias koj daim ntawv yuav tshuaj xav tau hom tsom iav twg, ntawm no yog kev piav qhia luv luv los pab koj pib.
1. Cov Lens Pom Kev Ib Zaug Yog Dab Tsi?
Ib lub tsom iav pom kev ib zaug yog lub tsom iav uas tuav tau ib daim ntawv yuav tshuaj. Hom tsom iav no yog siv rau cov neeg uas pom kev ze, pom kev deb, muaj astigmatism, lossis muaj kev sib xyaw ua ke ntawm qhov yuam kev refractive. Hauv ntau qhov xwm txheej, cov tsom iav pom kev ib zaug yog siv los ntawm cov neeg uas xav tau tib lub zog kom pom kev deb thiab ze. Txawm li cas los xij, muaj cov tsom iav pom kev ib zaug uas tau sau tseg rau ib lub hom phiaj tshwj xeeb. Piv txwv li, ib khub tsom iav nyeem ntawv uas tsuas yog siv rau kev nyeem ntawv muaj ib lub tsom iav pom kev ib zaug xwb.
Lub iav tsom iav pom kev ib sab yog qhov zoo tagnrho rau feem ntau ntawm cov menyuam yaus thiab cov neeg hluas vim tias lawv feem ntau tsis tas yuav kho lawv qhov kev kho qhov muag raws li lawv qhov deb. Koj daim ntawv yuav tshuaj tsom iav pom kev ib sab yeej ib txwm muaj lub pob kheej kheej ua tus lej thawj zaug ntawm koj daim ntawv yuav tshuaj thiab kuj tseem yuav muaj lub tog raj kheej los kho qhov astigmatism.
2. Cov Lens Bifocal Yog Dab Tsi?
Cov tsom iav ob sab muaj ob qho chaw sib cais ntawm kev kho qhov muag. Cov cheeb tsam raug faib los ntawm ib txoj kab sib txawv uas nyob kab rov tav hla lub lens. Sab saud ntawm lub lens yog siv rau qhov deb, thaum sab hauv qab yog siv rau kev pom ze. Qhov ntawm lub lens uas yog siv rau kev pom ze tuaj yeem ua tau ob peb txoj hauv kev sib txawv: D segment, round segment (pom/tsis pom), curve segment thiab E-line.
Feem ntau siv cov tsom iav bifocal yog tias muaj ib tug neeg uas tsis tshua muaj peev xwm hloov kho rau cov tsom iav progressive lossis rau cov menyuam yaus uas muaj qhov muag sib tshuam thaum lawv nyeem ntawv. Qhov laj thawj uas lawv tsis tshua siv lawv yog vim muaj teeb meem tshwm sim los ntawm cov tsom iav bifocal hu ua "dhia duab", uas cov duab zoo li dhia thaum koj lub qhov muag txav ntawm ob feem ntawm lub tsom iav.
3. Cov Lens Progressive Yog Dab Tsi?
Cov qauv tsim ntawm cov iav tsom iav progressive yog qhov tshiab dua thiab siab dua li cov iav bifocals. Cov iav no muab qhov sib txawv ntawm lub zog los ntawm sab saum toj ntawm lub iav mus rau hauv qab, muab kev hloov pauv tsis muaj teeb meem rau ntau yam kev xav tau pom. Cov iav tsom iav progressive kuj tseem hu ua cov iav bifocal tsis muaj kab vim tias lawv tsis muaj kab pom ntawm cov ntu, uas ua rau lawv zoo nkauj dua.
Tsis tas li ntawd xwb, cov tsom iav progressive kuj tsim kom muaj kev hloov pauv du ntawm qhov deb, qhov nruab nrab, thiab qhov ze ntawm koj daim ntawv yuav tshuaj. Qhov nruab nrab ntawm lub lens yog qhov zoo tagnrho rau cov haujlwm nruab nrab xws li kev ua haujlwm hauv computer. Cov tsom iav progressive muaj kev xaiv ntawm kev tsim txoj kev ntev lossis luv. Txoj kev hauv tsev yog qhov tseem ceeb ntawm lub lens uas muab peev xwm rau koj pom qhov deb nruab nrab.
Hauv ib lo lus, cov tsom iav pom kev ib zaug (SV), cov tsom iav ob sab, thiab cov tsom iav nce qib txhua tus muaj cov kev daws teeb meem sib txawv. Cov tsom iav pom kev ib zaug kho tau rau ib qho deb (ze lossis deb), thaum cov tsom iav ob sab thiab cov tsom iav nce qib kho tau ob qho tib si kev pom kev ze thiab deb hauv ib lub tsom iav. Cov tsom iav ob sab muaj ib txoj kab pom kev cais cov ntu ze thiab qhov deb, thaum cov tsom iav nce qib muab kev hloov pauv yooj yim, sib txawv ntawm qhov deb yam tsis muaj txoj kab pom kev. Yog tias koj xav tau cov ntaub ntawv ntxiv, thov hu rau peb.