Refractive yuam kev txhais tau hais tias cov duab ntawm koj lub qhov muag tsis khoov lub teeb kom raug, ua rau pom qhov muag plooj. Cov hom kev cuam tshuam tseem ceeb yog myopia (qhov ze ze), hyperopia (farsightedness), presbyopia ( tsis pom kev ze nrog hnub nyoog), thiab astigmatism.
Vim li cas presbyopia tsis yog qhov yuam kev refractive?
Txoj kev tshawb no xaus lus tias presbyopia tsis ua raws li cov ntsiab lus nruj classical ntawm kev ua yuam kev, vim muaj ntau lub qhov muag presbyopic uas tseem emmetropic nrog kev hwm rau qhov muag tsis paub.
4 qhov yuam kev refractive yog dab tsi?
Muaj 4 hom kev cuam tshuam tsis zoo:
- Nearsightedness (myopia) ua rau cov khoom nyob deb saib qhov muag plooj.
- Farsightedness (hyperopia) ua rau cov khoom nyob ze saib qhov muag plooj.
- Astigmatism tuaj yeem ua rau cov khoom nyob deb thiab ze ze saib qhov muag plooj lossis cuam tshuam.
- Presbyopia ua rau nyuaj rau cov neeg laus nruab nrab thiab cov laus kom pom qhov ze.
Yuav ua li cas yog presbyopia?
Presbyopia yog qhov maj mam poob ntawm koj ob lub qhov muag lub peev xwm tsom rau cov khoom nyob ze. Nws yog ib qho ntuj, feem ntau cuam tshuam ib feem ntawm kev laus. Presbyopia feem ntau yuav pom tshwm sim nyob rau hauv koj thaum ntxov txog nruab nrab-40s thiab txuas ntxiv zuj zus mus txog thaum muaj hnub nyoog 65.
Puas yog presbyopia puas qhov muag tsis pom kev?
Kev cuam tshuam tsis raug thiab presbyopia yog ib txwm muaj, kho qhov ua rau tsis pom kev thoob plaws ntiaj teb. Lub qhov muag ib txwm tsim cov duab meej los ntawm khoov (refracting) lub teeb kom nws tsom mus rau retina.
