Cov txheej txheem rau pom kev tsis taus uas qhov kev sau npe tuaj yeem suav rau kev zam ntawm kev ua tub rog tau muab teev rau hauv Daim Ntawv Teev Sijhawm Kev Mob Nkeeg. Yog li, kev zam ntawm kev hu yuav ua raws li kev tshawb pom ntawm myopia ntawm ntau dua 6 diopters lossis hyperopia ntawm ntau dua 8 diopters.
Qhov teeb meem ntawm kev zam ntawm kev ua tub rog vim yog qhov tsis pom kev zoo yog txiav txim siab ntawm lub rooj sib tham ntawm pawg thawj coj saib xyuas. Qhov ntsuas ntawm qhov pom ntawm qhov tsis zoo ntawm tus neeg sab nrauv tau txiav txim siab nyob rau hauv cov txheej txheem dhau ntawm cov kws kho mob tshwj xeeb - kws kho qhov muag. Txhawm rau txiav txim siab ntawm kev zam kev zam, nws yog qhov tsim nyog los tsim qhov kev ua kom muaj zog "D" (tsis haum) lossis "B" (tsis muaj qhov haum). Hauv kev ua haujlwm ntawm kev tshuaj xyuas thiab txiav txim siab txog qeb ntawm kev haum, tus kws kho mob tshwj xeeb yog coj los ntawm cov qauv teev tseg hauv kab lus 34, 35 ntawm Cov Sij Hawm ntawm cov kab mob. Daim ntawv teev caij nyoog tau pom zoo los ntawm tsab cai tshwj xeeb ntawm tsoomfwv ntawm Lavxias Lavxias, nws yog daim ntawv tseem ceeb hauv kev txheeb xyuas kev noj qab haus huv ntawm kev sau ntawv.
Kev zam ntawm cov tub rog nrog myopia thiab hyperopia
Hauv qhov pom ntawm myopia ntawm ib lub qhov muag los ntawm rau mus rau kaum ob lub diopters, tus kws sau ntawv tau muab tso ua pawg "B", vim tias nws raug tso tawm los ntawm pab tub rog. Los tsim cov qeb "D", nws yog qhov tsim nyog kom muaj myopia ntawm ib lub qhov muag dhau ntawm kaum ob diopters. Yog tias tus kws sau ntawv xav tau kev zam vim tias muaj qhov pom kev zoo, tom qab ntawd thaum kuaj mob, qhov ua rau pom qhov tsis txaus ntseeg nyob hauv tus nqi ntawm yim txog kaum ob diopters yuav tsum tau qhia tawm. Hauv qhov no, qhov kev tawm dag zog tsawg ntawm kev sau ntawv yuav tsim thiab kev tso tawm ntawm kev pabcuam yuav ua raws. Txhawm rau txiav txim siab cov qeb "tsis haum" yuav xav tau cov cim ntawm hyperopia ntawm ib lub qhov muag ntau dua kaum ob diopters.
Lwm yam kab mob ntawm cov khoom siv pom
Lub hauv paus rau kev tau txais cov qeb uas raug zam los ntawm kev pabcuam tsis yog tsuas yog nce qib ntawm myopia lossis hyperopia, tabsis tseem qee yam kabmob. Yog li, thaum astigmatism raug kuaj (kev ua txhaum ntawm lub duab ntawm lub qhov muag, lub ntsej muag lossis lub qhov muag, vim tias nws yog qhov nyuaj rau tsom qhov muag pom ntawm ib yam khoom) nrog qhov tsis kam ntawm qhov sib txawv ntawm plaub rau rau diopters hauv txhua qhov muag, pawg. "B" yuav tsum tau tsim. Yog tias qhov sib txawv ntawm qhov cuam tshuam rau ib qho kev xav astigmatism dhau rau rau tus diopters, tom qab ntawd ua tiav qhov tsis muaj tseeb rau kev pabcuam tau tsim. Ntxiv rau, kev txo qhov pom pom yuav yog lub hauv paus rau kev zam ntawm cov tub rog. Yog tias qhov ntsuas no tau pom qis dua 0.3 hauv ib qhov muag thiab qis dua 0.09 (lossis ua tiav qhov muag tsis pom kev), qeb "D" tau tsim nyob rau lwm qhov, uas txhais tau tias tso tawm tam sim ntawd los ntawm kev ua tub rog.
