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Video: Npaum li cas dhia duab xam?
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2024 Tus sau: Michael Samuels | [email protected]. Kawg hloov kho: 2023-12-16 01:44
xam duab dhia rau: CR-39 tiaj tus sab saum toj (qhov deb ntawm ntu OC mus rau ntu saum toj = 4mm) ntxiv +1.75D. Tsuas yog muab qhov nrug deb ntawm ntu ntu hauv centimeters los ntawm lub zog ntxiv (uas yog, 0.4 * 1.75 = 0.7 prism diopters).
Hais txog qhov no, duab dhia yog dab tsi?
Duab dhia : Kev hloov ntawm duab hais tias ib tus neeg tau ntsib thaum dhau los ntawm qhov kev ncua deb ntawm lub lens mus rau thaj tsam magnifying segment nyob rau hauv ib txoj kab bifocal. Lub ntsiab lus: ""
Ib yam li ntawd, slab off xam li cas? Txiav txim siab nrug deb ntawm qhov chaw kho qhov muag ntawm lub iav tsom iav mus rau qib nyeem ntawv. Siv Prentice Txoj Cai rau xam tus nqi ntawm ntsug prism induced nyob rau hauv txhua lub qhov muag ntawm qib nyeem ntawv. Qhov sib txawv ntawm tus nqi ntawm ntsug prism nyob rau hauv txhua lub qhov muag yog kwv yees li qhov sib npaug ntawm prism kom slabbed tawm .”
Tom qab ntawd, lo lus nug yog, lub slab tawm ntawm lub lens zoo li cas?
Slab - tawm muab lub hauv paus (BU) prism thiab siv rau qhov feem ntau rho tawm, lossis tsawg dua ntxiv tsom iav nyob rau hauv txoj kab nruab nrab ntawm txoj kab nruab nrab kom txo qis qis qis qis (BD) vim yog qhov rov qab tsom iav . Slab - tawm tuaj yeem yog koom nrog hauv iav lossis yas tsom iav , txawm hais tias txhua tus yog tsim nyob rau hauv ib txoj kev sib txawv.
Dab tsi yog qhov slab tawm ntawm bifocal?
Nws yog cov txheej txheem tshwj xeeb tsom iav siv los tshem tawm qhov tsis xav tau prism thaum saib los ntawm thaj chaw nyeem ntawv (feem ntau yog bifocal ) ntawm dav sib txawv lens powers. Slab tawm ua pov thawj tias daim duab ze yuav tsis raug tshem tawm.
Pom zoo:
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