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Magalasi owunikira a 1.56 a Porgressive HMC
Lenzi yotsogola ndi lenzi yokhala ndi ma focal length ambiri, yosiyana ndi magalasi owerengera achikhalidwe ndi magalasi owerengera a bifocal. Ma lenzi otsogola satopa chifukwa cha maso omwe amafunika kusintha nthawi zonse kutalika kwa focal pogwiritsa ntchito ma bifocal lengths, ndipo palibe mzere woonekeratu pakati pa mizere iwiri yolunjika. Ndi yabwino kuvala ndipo ili ndi mawonekedwe okongola, ndipo pang'onopang'ono yakhala chisankho chabwino kwambiri kwa anthu omwe ali ndi presbyopia.
