Retro nyeem iav tsom iav

Koj puas paub; nyeem tsom iav lo ntsiab muag kho koj lub zeem muag los ntawm khoov lub teeb nkag rau hauv koj lub qhov muag? Cov qib lossis qhov ntau ntawm lub teeb tau khoov yog hu ua "Refractive Index", lossis tsuas yog "Index". Vim li cas qhov no tseem ceeb thiab tseem ceeb dua li cas qhov no cuam tshuam rau cov neeg hnav lub hwj chim nyeem tsom iav? Nyeem rau thiab kawm ntxiv.

Diopters
Lub zog ntawm cov tsom iav xiav thaiv kev nyeem ntawv yog hais txog "Diopters", qhov no yog qhov sib txuas ncaj qha rau lo ntsiab muag "Index". Txhua yam tib yam, cov neeg tsim khoom sib txawv ntawm cov tsom iav nyeem ntawv tsuas yog xa mus rau lawv qhov sib txawv, koj kuj tseem yuav pom Diopter hais txog nrog "ntxiv" kos npe thiab txawm tias tsis tshua muaj lo lus "ntxiv". ntxiv rau 1.50 "cov no yog 1.50 Diopter nyeem tsom iav.

Kev nyeem tsom iav feem ntau pib ntawm ntxiv rau 1.00 vim qhov no yog ib qho kev nkag qib diopter rau tib neeg pib hnav cov nyeem ntawv. Txawm hais tias qhov no yog qhov nkag nkag nws tsis tau txhais hais tias nws yog qhov zoo tshaj plaws. Kev nyeem tsom iav tuaj yeem pom qhov qis dua ntxiv rau 0.25 tab sis tib neeg feem ntau tsuas yog squint los ntawm kev nyeem dhau los ntawm qhov chaw uas lub hwj chim no yuav tsim nyog, tab sis thaum lub sij hawm lawv ncav cuag ntxiv 1.00 qhov xav tau rau kev kho lub zeem muag tsis tuaj yeem tsis quav ntsej.

Lens
Yog li rov qab mus rau cov lo ntsiab muag, Index thiab siab dua lub hwj chim nyeem tsom iav. Nyob rau hauv txhua rooj plaub, qhov siab dua lub Diopter lub thicker lub lo ntsiab muag yuav tsum tau ua kom tiav qhov tseeb Index kom ua tau raws li qhov tsim nyog kho qhov muag. Ob qho ntawm feem ntau, thiab tus nqi qis, hom lens yog yas thiab iav. Yas lo ntsiab muag muaj Refractive Index ntawm kwv yees li 1.50 thaum iav yog siab dua me ntsis ntawm 1.52. Qhov Refractive Index no txiav txim siab ntau npaum li cas ntawm cov khoom xav tau kom ua tiav qhov kev nthuav dav kom raug. Tus lej qis dua cov khoom xav tau ntau dua. Yog li lub lens ua nrog cov khoom siv nrog qhov siab dua Refractive Index yuav ntau dua ntawm tib lub Diopter li lub lens ua nrog qis dua Refractive Index.

Kev nyeem tsom iav muaj zog
Lub zog tshaj plaws ntawm cov tsom iav nyeem siv niaj hnub no yog qhov ntxiv 1.50 nrog qhov nruab nrab nyob rau hauv qhov ntau ntxiv ntawm 0.75 txog 2.00. Vim qhov no ntau tus tsim cov iav nyeem tsis thab ua rau cov neeg nyeem hauv lub zog siab dua ntxiv rau 2.50 vim tias lawv tsis tuaj yeem muag txaus los lav ua rau lawv. Tab sis qhov no ua rau cov neeg siv khoom uas lawv lub qhov muag xav tau cov hwj chim siab dua no tsis muaj hmoo.

Cov poj niam hnav lub hwj chim nyeem ntawv siab siab nyeem iav tsom iav
Tam sim no koj paub me ntsis ntxiv txog lo ntsiab muag thiab Diopters thiab Refractive Index nws yuav ua rau muaj kev nkag siab ntau ntxiv thaum peb qhia rau koj tias Visualites cov neeg nyeem nrog lawv cov lo ntsiab muag Polycarbonate tau pom zoo dua, tshwj xeeb tshaj yog ntawm Diopters ntxiv 3.00 thiab nce. nyob rau hauv kev sib piv rau kev nyeem ntawv iav ua nrog yas los yog iav. High Power Reading Glasses feem ntau yog xa mus rau ntxiv 3.00 tsom iav nyeem ntawv, ntxiv rau 3.50 nyeem ntawv iav thiab ntxiv 4.00 tsom iav nyeem. Nws tsis tshua muaj qhov xav tau kev nthuav dav ntau dua li ntxiv rau 4.00 thiab cov uas ua tau tej zaum yuav muaj mob xws li astigmatism lossis macular tiam. Koj yuav tsum tau kuaj koj ob lub qhov muag tsis tu ncua los ntawm tus kws tshaj lij tab sis yog tias koj pom koj tus kheej xav tau siab dua ntxiv rau 4.

Cim npe nrov: retro nyeem iav tsom iav, Tuam Tshoj, lwm tus neeg, manufacturers, hoobkas, customized, lag luam wholesale, yuav, luv nqi