Magalasi owerengera a LED owonjezera

Magalasi a Presbyopic, omwe amadziwikanso kuti magalasi a presbyopic, ndi mtundu wa mankhwala opangidwa ndi kuwala, magalasi a anthu omwe ali ndi presbyopia, omwe ali a lens convex.Magalasi owerengera ndi ofunika kwambiri kuti akwaniritse zosowa za anthu omwe ali ndi presbyopia.Magalasi owerengera amagwiritsidwa ntchito kuwonjezera masomphenya a anthu azaka zapakati ndi okalamba.Monga magalasi a myopia, pali zizindikiro zambiri za kuwala zomwe zimaperekedwa ndi miyezo ya dziko, komanso palinso malamulo apadera ogwiritsira ntchito.Kugwiritsa ntchito magalasi owerengera kumagwira ntchito yofunika kwambiri pakukweza moyo wa anthu.Pali mitundu itatu ikuluikulu ya magalasi owerengera pamsika, yomwe ndi masomphenya amodzi, masomphenya awiri ndi multifocal yopita patsogolo.Magalasi a masomphenya amodzi amatha kugwiritsidwa ntchito kuti muwone pafupi, ndipo muyenera kuvula magalasi mukawona patali.Bifocals amatanthauza kuti theka lapamwamba la lens limagwiritsidwa ntchito kuti liwone kutali, ndipo theka lakumunsi la lens limagwiritsidwa ntchito kuti liwone pafupi, koma magalasi owerengera amtunduwu ali ndi chodabwitsa chodumpha, ndipo maonekedwe si okongola.Ma lens opita patsogolo a multifocal amatha kukwaniritsa zosowa zakutali, pakati ndi pafupi, komanso mawonekedwe ake ndi abwino kwambiri.