Iifreyimu zamadoda kunye nabasetyhini be-optical, isinyithi & isakhelo se-acetate, iimveliso zothotho zenziwe ngokwezifiso kunye neentlobo ezahlukeneyo zesakhelo ukuze zihambelane neemilo zobuso ezahlukeneyo, kwaye ixabiso lilungele isitayile samazwe akuMbindi Mpuma.