Ma lens a Progressive ndi mandala amitundu yambiri.Mosiyana ndi magalasi owerengera achikhalidwe ndi magalasi owerengera kawiri, magalasi opita patsogolo satopa chifukwa chosintha nthawi zonse kuyang'ana kwa diso pogwiritsa ntchito magalasi olunjika pawiri, komanso alibe mzere wolekanitsa bwino pakati pa utali wolunjika.Valani mawonekedwe omasuka, okongola, pang'onopang'ono mukhale chisankho chabwino kwambiri cha presbyopia.