A concave lens yog siv los kho qhov pom kev luv luv (myopia). Tus neeg pom luv luv yog tsom mus rau tom qab ntawm lub qhov muag. Lub lens concave thawb cov rays ntawm lub teeb sib nrug kom lawv tuaj txog ua ke kom pom tseeb ntawm qhov muag tom qab.
Qhov lo ntsiab muag twg yog qhov zoo tshaj plaws rau myopia?
Lens siv los kho qhov ze qhov pom yog concave hauv cov duab. Hauv lwm lo lus, lawv yog thinnest ntawm qhov chaw thiab thicker ntawm ntug. Cov lo ntsiab muag no hu ua " minus power lo ntsiab muag" (los yog "minus lo ntsiab muag") vim lawv txo lub zog ntawm qhov muag.
Vim li cas lub lens concave siv hauv myopia?
Thaum siv lub lens concave, nws diverges lub teeb ua ntej lawv tau tsom mus rau lub lens ntawm lub qhov muag. Qhov no ua rau kom pom lub teeb ntawm retina nws tus kheej thiab tsis nyob rau pem hauv ntej. Cov lo ntsiab muag no tuaj yeem siv los ua cov tsom iav lossis cov tsom iav. Li no, lub lens concave yog siv los kho myopia.
Puas yog myopia zoo lossis tsis zoo?
Kev nkag siab txog koj cov tshuaj tsom iav
Qhov no tuaj yeem siv los ua cov tsom iav lossis cov tsom iav. Koj cov tshuaj feem ntau yuav muaj 3 tus lej tseem ceeb rau txhua qhov muag. Cov no yog: Sph (sphere) – tus lej zoo ntawm no qhia tias koj pom qhov ntev, thaum tus lej tsis zoo qhia tias koj pom qhov luv.
Dab tsi yog hom myopia?
Different Types of Myopia
Muaj ob hommyopia: 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.
