Zina mwazinthu zazikulu zomwe zikuyembekezeka kuyendetsa msika wamagalasi olumikizirana ndi monga kukwera kwa matenda amaso monga myopia, presbyopia, ndi astigmatism, komanso moyo wongokhala, kuchuluka kwa anthu okalamba, kukhala pachiwopsezo cha presbyopia, komanso kulakalaka kwa ogwiritsa ntchito kumapeto kwa presbyopia.Odziwa...
Werengani zambiri