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Magalasi a 1.59 PC Bifocal Invisible Photochromic Gray HMC Optical
Pakadali pano, pali mitundu iwiri ya zipangizo za lenzi pamsika, imodzi ndi galasi, inayo ndi resin. Zipangizo za resin zimagawidwa m'magulu awiri: CR-39 ndi polycarbonate (zipangizo za PC).
Magalasi a bifocal kapena magalasi a bifocal ndi magalasi omwe ali ndi malo awiri owongolera nthawi imodzi ndipo amagwiritsidwa ntchito kwambiri powongolera presbyopia. Malo akutali omwe amakonzedwa ndi lenzi ya bifocal amatchedwa dera lakutali, ndipo malo apafupi amatchedwa dera lapafupi ndi malo owerengera. Nthawi zambiri, chigawo chakutali chimakhala chachikulu, motero chimatchedwanso filimu yayikulu, ndipo chigawo chapafupi ndi chaching'ono, motero chimatchedwa filimu yaying'ono.
