Imyenda ifunga amazi, igicuruzwa gishya - fibre fibre amazi-yabyimbye amazi - gufunga umugozi ukoreshwa muguhagarika amazi yubwoko bushya bwinsinga za optique zo mu bwoko bwa optique, byatejwe imbere kandi bikozwe na Sosiyete ishingiye ku buhanga bushya bwo guhagarika amazi muri optique na amashanyarazi yumuriro murugo no mumahanga. Irangwa nibyiza nkumuvuduko wihuta wamazi, umuvuduko mwinshi wo kwaguka, guhangayika gukomeye, nta aside na base, nta ngaruka zifatika zakozwe ku nsinga, ituze rya termo, ituze ryimiti hamwe no kutangirika nibindi mubikorwa byo gukora insinga za optique, kuzuza ibikoresho nka jelly ya kabili, kaseti ifunga amazi hamwe nudodo two gufunga nibindi birashobora kuvaho.