Video: Dab tsi yog qhov pom kev pom ntawm 6 9?
2024 Tus sau: Michael Samuels | [email protected]. Kawg hloov kho: 2023-12-16 01:44
Cov qhov tseeb tsuas yog txhais tau tias, tus neeg zoo li cas pom kev tuaj yeem pom los ntawm cuaj taw tawm, ib tus neeg nrog kev ac6 / 9 yuav tsum sawv ntsug peb taw ze (ntawm rau taw) kom pom nws.
Kuj paub yog, puas yog 6'9 lub zeem muag xav tau tsom iav?
6/9 zeem muag txhais tau tias muaj peev xwm nyeem tau ib qho me me ntawm cov ntawv ntawm Snellen pom kev daim ntawv qhia meej Yog tias koj muaj -3.0 ntawm shortsightedness/myopia, koj yuav tsis pom 6/9 ntawm daim ntawv ntawm 6 meters, tsis muaj tsom iav . Yog li pib yog tias koj ua tsis muab tsom iav thiab koj VA yog 6/6, 6/9 , koj nyob hauv qeb A-2.
Ib yam li ntawd, lub ntsiab lus ntawm 6 6 hauv qhov muag kuaj yog dab tsi? 6/6 lub zeem muag txhais tau tias tias tus neeg mob/tus saib muaj peev xwm nyeem tau ntawm qhov deb ntawm 6 meters li tus neeg laus ib txwm muaj pom kev Nws muaj peev xwm nyeem tau los ntawm qhov deb ntawm 6 meters. Hauv lwm lo lus, nws yog thaum tus neeg mob tuaj yeem nyeem kab kawg ntawm Snellen daim ntawv.
Kuj paub, koj puas muaj qhov pom kev ntawm 6 12?
Yog tias ib tus neeg muaj pom qhov tseeb ntawm 6 / 12 , nws tau hais kom pom ntxaws los ntawm 6 meters (20 ft) deb tib yam li tus neeg nrog "ib txwm" qhov muag yuav pom nws los ntawm 12 meters (39 ft) deb.
Dab tsi yog qhov ib txwm pom kev acuity?
Visual acuity yog qhia raws li ib feem, xws li 20/20. Muaj 20/20 pom kev txhais tau tias koj pom kev ntawm 20 ko taw deb ntawm qhov khoom yog li qub . Yog tias koj muaj 20/40 pom kev Piv txwv li, qhov ntawd txhais tau tias koj yuav tsum nyob nrug deb li 20 feet kom pom cov khoom uas tib neeg ib txwm tuaj yeem pom los ntawm 40 ko taw deb.
Pom zoo:
Dab tsi yog qhov txiaj ntsig ib txwm rau PaO 2 Dab tsi yog qhov txiaj ntsig rau kev txiav txim siab qhov hnyav ntawm hypoxemia?
Zoo li feem ntau qhov kev kho mob ib txwm muaj txiaj ntsig thiab ntau yam, lub ntsiab lus tuaj yeem sib txawv me ntsis, tab sis feem ntau cov ntsiab lus hauv qab no siv: Ua rau me me hypoxemia: PaO2 = 60 txog 79 mmHg. Qhov nruab nrab hypoxemia: PaO2 = 40 txog 59 mmHg. Hypoxemia hnyav: PaO2 <40 mmHg
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