Nearer point of hypermetropic eye=40 cm. Raws li peb paub tias hypermetropia qhov tsis xws luag ntawm lub qhov muag raug kho los ntawm kev siv lub lens convex lens. Yog li, tus neeg yuav tsum tau tsom iav qhov muag.
hom lo ntsiab muag twg siv rau kev kho mob hyperopia?
Cov lo ntsiab muag no yog siv los kho qhov pom kev ze (myopia). Convex lo ntsiab muag. Cov lo ntsiab muag no yog tuab tshaj plaws nyob rau hauv nruab nrab, zoo li lub iav tsom iav. Lawv siv los kho qhov pom kev deb (hyperopia).
Yuav ua li cas lub qhov muag pom cov neeg xav tau?
Lens siv los kho qhov pom kev ze yog concave hauv cov duab Hauv lwm lo lus, lawv nyias nyias ntawm qhov nruab nrab thiab tuab ntawm ntug. Cov lo ntsiab muag no hu ua "minus power lo ntsiab muag" (lossis "minus lo ntsiab muag") vim tias lawv txo lub zog ntawm lub qhov muag.
Dab tsi yog hom myopia?
Muaj ob hom myopia: siab myopia thiab pathological myopia. Kev mob myopia siab tuaj yeem ua rau muaj kev pheej hmoo ntawm cov retinal detachment, glaucoma, thiab cataracts. Pathological myopia yog lub npe hu ua kab mob degenerative uas pib thaum yau thiab ua rau neeg laus zuj zus.
Kuv puas yuav tsum hnav tsom iav txhua lub sijhawm?
Teb: Thaum koj pib hnav koj lub tsom iav, koj yuav pom tias koj lub zeem muag pom tseeb dua uas koj xav hnav lawv txhua lub sijhawm. Yog tias koj xis nyob, ces tsis muaj laj thawj vim li cas koj tsis tuaj yeem hnav koj lub tsom iav ntau npaum li koj xav tau.
