Magalasi Owerengera a Magnifying Glass

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, ali ndi zizindikiro zambiri za kuwala zomwe zimaperekedwa ndi miyezo ya dziko, komanso ali ndi 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.Presbyopia ndi yachibadwa zokhudza thupi chodabwitsa, osati matenda a maso, ndipo si kwa okalamba okha.Pambuyo pa zaka 40, ndi kuchepa kwapang'onopang'ono kwa disolo la diso la munthu ndi kufa kwapang'onopang'ono kwa minofu ya ciliary, diso la munthu silingathe kusintha bwino mawonekedwe a diso (kusintha kwa axial).Pamene chinthu chiyenera kusunthidwa kuti chiwone bwino, mawonekedwe a diso panthawiyi amatchedwa presbyopia.