Video: Jaeger eye chart yog dab tsi?
2024 Tus sau: Michael Samuels | [email protected]. Kawg hloov kho: 2023-12-16 01:44
Cov Jaeger daim ntawv qhia yog ib daim duab qhov muag siv hauv kev sim ze pom kev qhov tseeb. Nws yog daim npav uas cov kab lus ntawm cov ntawv tau luam tawm, nrog cov ntawv me me nce los ntawm 0.37 mm txog 2.5 mm. Daim npav no yuav tsum yog tuav los ntawm tus neeg mob nyob ntawm qhov deb ntawm qhov qhov muag nyob ntawm qhov loj me J tau nyeem.
Tsis tas li ntawd, koj siv daim ntawv qhia qhov muag Jaeger li cas?
1. Muab lub daim duab ntawm 14 ntiv tes los ntawm cov neeg qhov muag thiab ua kom pom kev daim duab ntawm qhov deb. 2. Yog tus neeg mob siv tsom iav, ces tus xeem yuav tsum tau ua siv lawv.
Ib qho ntxiv, kab ntawv ntawm daim duab 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) nyeem cov ntawv uas tus neeg muaj lub siab zoo nyeem tau ntawm 12 meters (39 ft).
Ib yam li ntawd, nws raug nug, daim ntawv qhov muag txhais li cas?
Ib daim ntawv qhia qhov muag ntsuas qhov muag pom kev, uas yog qhov pom tseeb lossis ntse ntawm qhov muag. Tus naj npawb saum toj kawg nkaus yog koj qhov nrug deb ntawm taw daim duab . Tus lej hauv qab yog qhov kev ncua deb ntawm tus neeg uas qhov muag pom kev tuaj yeem nyeem tib kab. Piv txwv li, yog tias koj muaj 20/30 lub zeem muag, nws txhais tau tias koj lub zeem muag tsis zoo tshaj qhov nruab nrab.
20/20 lub zeem muag ntawm daim duab qhov muag yog dab tsi?
Kev pom qhov muag feem ntau ntsuas nrog Snellen daim duab . Snellen kab kos tso saib cov tsiaj ntawv me me zuj zus. "Li qub" pom kev yog 20/20 . Qhov no txhais tau tias cov ntawv xeem pom tib kab ntawv ntawm 20 ko taw tus neeg ntawd li qub pom kev pom ntawm 20 ko taw.
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