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Video: Macula lutea nyob qhov twg?
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2024 Tus sau: Michael Samuels | [email protected]. Kawg hloov kho: 2023-12-16 01:44
Cov macula zaum ze ntawm qhov chaw nruab nrab ntawm retina ntawm tib neeg qhov muag. Cov macula los yog macula lus yog thaj tsam zoo li lub ntsej muag xim nyob ze qhov chaw nruab nrab ntawm lub qhov muag ntawm tib neeg qhov muag thiab qee qhov lwm qhov muag tsiaj.
Thiaj li, qhov sib txawv ntawm macula lutea thiab Fovea Centralis yog dab tsi?
Cov macula lus , los yog macula rau luv, yog nyob hauv central retina cheeb tsam ib sab, lossis rau sab ntawm , lub paj hlwb, thiab txheej txheem tsuas yog lub teeb uas los ntawm qhov chaw ntawm qhov muag pom kev. Cov macula muaj feem ntau cones thiab ob peb rods, thiab fovea centralis cov muaj tsuas yog cones thiab tsis muaj pas nrig.
Tom qab ntawd, lo lus nug yog, macula nyob qhov twg cuam tshuam nrog lub kho qhov muag disc? Macula thiab Optic Disc Cov macula yog ib puag ncig ncig ntawm txoj kab uas hla 5.5 mm nrog lub chaw nyob 17 degrees, lossis 4.0-5.0 mm, sab cev nqaij daim tawv, thiab 0.53 - 0.8mm qis dua rau nruab nrab ntawm optic daim ntawv . Qhov nruab nrab ntawm cov hlab ntsha hauv nruab nrab (xub xub dub) yog nyob ntawm qhov ntswg mus rau hauv nruab nrab cov leeg leeg (xub xub ntsuab) hauv optic daim ntawv.
Ib sab ntawm no, puas yog macula zoo ib yam li fovea?
Cov fov ua yog lub qhov me me hauv retina ua ke nrog lub hauv paus ntawm lub lens, qhov twg macula yog thaj chaw loj dua suav nrog thiab ib puag ncig fov ua . Cov fov ua muaj kwv yees li ntawm 4, 000 qhov me me, nyob sib ze sib thooj (tsis muaj pas nrig) thiab ua kom pom qhov siab tshaj plaws nyob txhua qhov chaw ntawm lub qhov muag.
Puas yog macula lutea muaj pas nrig?
Cov macula yog qhov me ntsis redder tsuas yog txoj cai ntawm qhov chaw. Qhov ci dua, thaj chaw daj yog lub paj hlwb. Ua feem ntau ntawm cov khob hliav qab (cov duab photoreceptor lub luag haujlwm rau lub zeem muag xim). Nws ua tsis muaj tus pas nrig hlwb.
Pom zoo:
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