Video: Kab twg koj yuav tsum tuaj yeem nyeem ntawm kab ntawv qhov muag?
2024 Tus sau: Michael Samuels | [email protected]. Kawg hloov kho: 2023-12-16 01:44
Ib tug me nyuam 3 txog 4 xyoos yuav tsum ua muaj peev xwm nyeem tau ua 20/40 kab , thiab tus menyuam hnub nyoog 5 xyoos 20/30 kab . Cov menyuam yaus thiab cov laus yuav tsum ua muaj peev xwm nyeem tau feem ntau ntawm cov ntawv ntawm 20/20 kab . Yog koj ceeb toom ib qho txiaj ntsig uas poob sab nraum cov qauv no, nco ntsoov teem sijhawm qhov muag xeem nrog koj Lub Zeem Muag Tus kws kho mob qhov chaw.
Kuj paub, kab twg ntawm kab ntawv qhov muag yog 20 40?
Yog tias qhov no yog qhov tsawg tshaj plaws kab ib tus neeg tuaj yeem nyeem, tus neeg lub suab yog "6/12" (" 20 / 40 "), lub ntsiab lus tias tus neeg no yuav tsum tau mus kom ze rau 6 meters ( 20 ft) los nyeem cov ntawv uas tus neeg uas muaj lub ntsej muag zoo tuaj yeem nyeem ntawm 12 meters (39 ft).
Ib sab saum toj, dab tsi yog kab hauv qab ntawm kab ntawv qhov muag? Cov hauv qab tus lej qhia txog qhov kev ncua deb uas tus neeg uas pom kev ib txwm tuaj yeem nyeem tib yam kab . Piv txwv li, yog kab thib tsib ntawm Snellen daim duab yog kab me tshaj plaws uas koj tuaj yeem nyeem, koj yuav muaj 20/40 pom kev.
Xav txog qhov no, koj txhais li cas daim duab Snellen?
Rau txhais koj nyeem ntawv , xav txog tus lej hauv ko taw. Piv txwv li, ib tus neeg nrog 20/60 pom kev tau nyeem ntawm 20 ko taw deb li cas tus neeg nrog ib txwm muaj pom kev yuav nyeem ntawm 60 feet deb. Cov chav kuaj kab mob optometric niaj hnub no tau nruab nrog hluav taws xob qhov muag nyeem kab kos , ua kom yooj yim los tsim qhov nyeem tau raug.
Cov ntawv loj npaum li cas ntawm daim duab qhov muag?
Siv Snellen Daim Ntawv Qhov Muag Yog li yog tias, ntawm 20 ko taw, koj tuaj yeem nyeem cov ntawv ntawv ntawm kab cim "40," qhov no txhais tau tias koj muaj qhov pom pom ntawm 20/40 lossis zoo dua: 1/2 ib txwm. Los ntawm 10 ko taw, yog qhov tsawg tshaj plaws ntawv koj tuaj yeem nyeem tau ntawm kab "40", qhov no yuav ua rau koj muaj qhov tseeb ntawm 10/40: 1/4 ib txwm.
Pom zoo:
Koj puas tuaj yeem dig muag los ntawm roj av hauv koj lub qhov muag?
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