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1.59 PC Bifocal Invisible Blue Dulani magalasi a HMC Optical
Ma lens a Bifocal kapena Bifocal lens ndi ma lens omwe amakhala ndi magawo awiri owongolera nthawi imodzi ndipo amagwiritsidwa ntchito makamaka kukonza presbyopia. Malo akutali okonzedwa ndi lens bifocal amatchedwa dera lakutali, ndipo dera lapafupi limatchedwa pafupi ndi malo owerengera. Kawirikawiri, dera la distal ndi lalikulu, choncho limatchedwanso filimu yaikulu, ndipo dera loyandikana nalo ndi laling'ono, choncho limatchedwa sub-filimu.
