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1.59 PC Blue kudula Bifocal Invisible Photochromic Gray magalasi a HMC Optical
Monga momwe dzinalo likusonyezera, galasi la bifocal lili ndi kuwala kuwiri.Kawirikawiri, amagwiritsidwa ntchito kuona mtunda, monga kuyendetsa galimoto ndi kuyenda;Zotsatirazi ndikuwona kuwala kwapafupi, kuwona pafupi, monga kuwerenga, kusewera foni yam'manja ndi zina zotero.Pamene bifocal mandala anangotuluka, izo ndithudi ankaona ngati Uthenga Wabwino wa myopia + presbyopia, kuthetsa vuto la kunyamula pafupipafupi kunyamula ndi kuvala, koma monga momwe anthu amagwiritsira ntchito, akupezeka kuti zofooka za bifocal mandala alinso ambiri.
