1.523 mchere woyera Bifocal mandala

Ubwino wa magalasi owoneka bwino a mineral kwa wovala

* Amakhala ndi mawonekedwe apamwamba komanso okhazikika.
* Imakana kukala poyerekeza ndi magalasi agalasi a organic.
* Mitundu yambiri imapezeka mu mawonekedwe a tinted, magalasi oteteza dzuwa, kuphatikizapo omwe ali ndi zokutira zamagalasi, komanso photochromic.
* Zovala zowoneka bwino zimamatira bwino pamwamba pa magalasi owoneka bwino a mchere.
* Magalasi apamwamba a refractive index amathetsa vuto la magalasi owoneka bwino.Mapangidwe a lenticular ndi aspherical surface amapangitsa kuti magalasi owoneka awa akhale ochepa, osalala, opepuka.