Lens ya PC, yomwe imadziwikanso kuti "space film", chifukwa cha kukana kwake, ilinso ndi galasi lodziwira zipolopolo.Magalasi a polycarbonate amalimbana kwambiri ndi mphamvu, sangasweka.Amakhala amphamvu kuwirikiza ka 10 kuposa magalasi kapena pulasitiki wamba, kuwapangitsa kukhala abwino kwa ana, magalasi achitetezo, ndi ntchito zakunja.
Magalasi opita patsogolo, omwe nthawi zina amatchedwa "no-line bifocals," amachotsa mizere yowoneka ya ma bifocals achikhalidwe ndi ma trifocals ndikubisa kuti mukufuna magalasi owerengera.
Tags:Bifocal mandala, patsogolo mandala, 1.56 pc mandala