magalasi mtundu kusintha ndi kuwala, monga bulauni kapena inki panja kuwala amphamvu, ndi mandala m'nyumba, akhoza kuchita zoteteza maso, makamaka kupewa ultraviolet cheza ndi buluu kuwala kusefa ndi wa thandizo lalikulu.
Kwa anthu omwe ali ndi myopia omwe amafunika kuvala magalasi kuti atuluke, magalasi osintha mtundu amatha kupulumutsa mtolo wochotsa magalasi a myopic ndi magalasi, komanso amatha kuthetsa vuto lomwe amayi ena sali ophweka kunyamula magalasi angapo opanda matumba.