Iiglasi zamehlo ezahlukeneyo zifezekisa iziphumo ezahlukeneyo kwaye akukho lens ifaneleke kakhulu kuyo yonke imisebenzi.Ukuba uchitha ixesha elongeziweyo usenza imisebenzi ethile, njengokufunda, umsebenzi wedesika okanye umsebenzi wekhompyuter, unokufuna iiglasi ezikhethekileyo.Iilensi zokongeza ezithambileyo zenzelwe ukutshintshwa kwesibini sokuqala kwizigulana ezinxibe iilensi zombono omnye.Ezi lens zicetyiswa 18-40 iminyaka myopia ubudala abafumana iimpawu zamehlo adiniweyo.