Magalasi azitsulo azitsulo ali ndi ubwino wokhazikika, wopepuka, wokongola, wowoneka bwino, chitsulo chimango chimakhala ndi chithandizo cha mphuno ndi chithandizo cha mphuno chikhoza kukhala mbali yam'manja kuti igwirizane ndi mitundu yonse ya mphuno.Lens phazi mapeto chifukwa kuphimba pulasitiki chivundikirocho, wokongola ndi kuteteza khungu.Magalasi amatchinga magetsi owala osasangalatsa ndikuteteza maso anu ku cheza cha ultraviolet.Zonsezi ndi chifukwa cha zitsulo zosefera ufa zomwe "zisankha" kuwala pamene zimalowa.Magalasi achikuda amamwetsa mafunde omwe amapanga kuwala kwa dzuwa chifukwa amagwiritsa ntchito ufa wabwino kwambiri wachitsulo (chitsulo, mkuwa, faifi tambala, etc.).Ndipotu kuwala kukakhala pa lens, kumachotsedwa, potengera njira yotchedwa kusokoneza kowononga.