Iimvavanyo zombono zijonga imisebenzi emininzi eyahlukeneyo yeliso.Abanye banokujonga ukuba ubuthathaka kangakanani kwi-glare (ukukhanya kokukhanya), ukuba amehlo akho asebenzisana kakuhle kangakanani ukubonelela ngembono enzulu, njl. Iimvavanyo zombono ziqhele ukwenziwa kunye neemviwo kunye iimvavanyo ezijonga impilo yeliso.