Video: Dab tsi yog qhov kev pom qhov pom kev zoo li qub?
2024 Tus sau: Michael Samuels | [email protected]. Kawg hloov kho: 2023-12-16 01:44
6/5 txog 6/4
Ib yam li ntawd, qhov pom kev zoo li qub yog dab tsi?
Visual acuity tau hais tawm ua ib feem, xws li 20/20. Muaj 20/20 pom kev txhais tau tias koj pom kev ntawm 20 ko taw deb ntawm ib yam 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 pom tau los ntawm 40 ko taw deb.
Qhov pom kev acuity ntsuas li cas? Visual acuity . Qhov no, qhov tseeb, yog qhov ntse ntawm koj lub zeem muag. Visual acuity yog ntsuas los ntawm koj lub peev xwm los txheeb xyuas cov ntawv lossis cov lej ntawm daim ntawv qhia qhov muag los ntawm qhov pom qhov deb. Visual acuity tau sim ib lub qhov muag ib zaug, nrog kev pab los ntawm tus qauv Snellen qhov muag daim duab.
Qhov thib ob, qhov muag pom zoo yog dab tsi?
Visual acuity ntawm 20/20 yog suav tias yog " pom kev zoo tag nrho "vim tias tsis muaj kev pab yuav tsum pom zoo dua, tab sis tib neeg tuaj yeem muaj qhov zoo dua 20/20 pom kev . Ntau tus tub ntxhais hluas tuaj yeem pom cov ntawv me dua qhov "20/20" loj.
Lub ntsiab lus ntawm 6 6 lub zeem muag 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 duab.
Pom zoo:
Dab tsi yog qhov kev nkag siab tsis tu ncua thiab dab tsi yog qhov loj me me qhov ntev xim tsis tu ncua zoo li qub)?
Kev nkag siab tsis tu ncua, tseem hu ua qhov tsis sib xws, lossis qhov tshwm sim tsis tu ncua, kev nyiam tsiaj thiab tib neeg kom pom cov khoom paub zoo li muaj tus qauv zoo, qhov loj me, xim, lossis qhov chaw tsis hais txog kev hloov pauv ntawm lub kaum sab xis ntawm kev xav, nrug deb, lossis teeb pom kev zoo
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