Imveliso nganye yeeglasi zochungechunge lwe-F inombono wokuqala, odibanisa indibaniselwano egqibeleleyo yoyilo lobuchule kunye nobuchule obugqwesileyo bokubonelela abathengi ngeemveliso zeglasi ezintsha nezilungileyo. Ukunxiba uthotho lwezibuko zelanga akunakukhusela kuphela kwimitha yelanga ye-ultraviolet kunye nokubengezela okungafaniyo okungaqhelekanga, kodwa kukwenza ube nembonakalo entle yomhlaba kwisihlwele esikhulu.