Thaum pib yog lo lus, thiab lo lus yog qhov muag plooj.Qhov ntawd yog vim qhov tsom iav tsis tau tsim dua.Yog tias koj pom qhov ze, pom deb lossis muaj astigmatism, koj tsis muaj hmoo.Txhua yam yog qhov muag plooj.Nws tsis yog txog rau thaum xyoo pua 13th uas kho lo ntsiab muag tau tsim thiab tsis zoo, ...
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