Video: Visual Acuity Test yog dab tsi?
2024 Tus sau: Michael Samuels | [email protected]. Kawg hloov kho: 2023-12-16 01:44
Cov kev ntsuas qhov muag yog siv los txiav txim cov ntawv me tshaj plaws uas koj tuaj yeem nyeem tau ntawm tus qauv daim duab (Snellen daim duab ) lossis ib daim npav tuav 20 ko taw (6 meters) deb. Cov kab kos tshwj xeeb yog siv thaum xeem ntawm qhov deb luv dua 20 ko taw (6 meters). Qee cov kab kos Snellen yog cov saib video uas qhia cov ntawv lossis cov duab.
Tom qab ntawd, ntsuas qhov pom kev pom li cas?
Pom qhov tseeb . Qhov no, qhov tseeb, yog qhov ntse ntawm koj lub zeem muag. Visual acuity yog ntsuas los ntawm koj lub peev xwm los txheeb cov tsiaj ntawv lossis tus lej ntawm tus qauv ntsuas qhov muag los ntawm kev saib tshwj xeeb. Visual acuity yog kuaj ib lub qhov muag ntawm ib lub sij hawm, nrog kev pab los ntawm ib tug standardized Snellen qhov muag daim ntawv qhia.
Tsis tas li ntawd, dab tsi cuam tshuam rau kev pom qhov muag? Visual acuity yog txwv los ntawm diffraction, aberrations, thiab photoreceptor ceev nyob rau hauv lub qhov muag (1). Sib nrug los ntawm cov kev txwv no, tus lej ntawm yam kuj cuam tshuam qhov pom kev acuity , xws li kev ua yuam kev tsis pom kev, lub teeb pom kev zoo, qhov sib txawv, thiab qhov chaw ntawm retina raug txhawb.
Kuj paub, qhov pom kev zoo ib txwm yog dab tsi?
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.
Qhov muag twg koj sim ua ntej rau qhov pom tseeb?
Lwm tus nyiam xeem qhov 'phem dua' qhov muag thawj (nug tus neeg mob tawm ntawm qhov twg eye lawv saib zoo tshaj). Qhov no xyuas kom meej tias qhov tsawg kawg yog nyeem nrog 'qhov phem' qhov muag , thiab ntau yuav tau nyeem nrog 'zoo' qhov muag . Qhov no txhais tau tias tsis muaj ntawv yog nco qab, uas tuaj yeem ua qhov thib ob pom kev tshwm zoo dua li nws yog.
Pom zoo:
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