Kurya. Kubera ubushobozi bwabo bwo kugorora urumuri neza, indangagaciro-ndende yo kureba kure ifite impande zoroheje kuruta lens zifite imbaraga zimwe zo kwandikwa zikozwe mubintu bisanzwe bya plastiki.
Umucyo. Impande zoroheje zisaba ibikoresho bike, bigabanya uburemere rusange bwinzira. Lens ikozwe muri plastike yo murwego rwohejuru iroroshye kuruta lens imwe ikozwe muri plastiki isanzwe, kuburyo byoroshye kwambara.
Umucyo ugaragara urimo urutonde rwuburebure nimbaraga. Itara ry'ubururu nigice cyumucyo ugaragara urimo ingufu zisumba izindi. Kubera imbaraga nyinshi, urumuri rwubururu rufite ubushobozi bwinshi bwo kwangiza ijisho kuruta urumuri rugaragara.
Itara ry'ubururu rifite uburebure n'imbaraga kuva kuri 380 nm (ingufu nyinshi kugeza kuri 500 nm (ingufu nkeya).
Rero, hafi kimwe cya gatatu cyumucyo ugaragara ni itara ry'ubururu
Itara ry'ubururu ryongeye gushyirwa muri aya matsinda (ingufu nyinshi kugeza ingufu nke):
· Itara rya Violet (hafi 380-410 nm)
· Itara ry'ubururu-violet (hafi 410-455 nm)
· Itara ry'ubururu-turquoise (hafi 455-500 nm)
Kubera imbaraga zabo nyinshi, violet nubururu-violet imirasire irashobora kwangiza ijisho. Kubera iyo mpamvu, iyi mirase (380-455 nm) nayo yitwa "urumuri rwubururu rwangiza."
Imirasire yubururu-turquoise kurundi ruhande, ifite imbaraga nke kandi bigaragara ko ifasha gukomeza gusinzira neza. Kubera iyo mpamvu, imirasire (455-500 nm) rimwe na rimwe yitwa "urumuri rwubururu rufite akamaro."
Imirasire itagaragara ya ultraviolet (UV) irambaraye hejuru yingufu zisumba izindi zose (violet) yumucyo wubururu urumuri rwubururu UV imirasire ngufi ningufu nyinshi kuruta ingufu zubururu bugaragara. Imirasire ya UV byagaragaye ko yangiza amaso nuruhu.
1. Itara ry'ubururu riri hose.
2. Imirasire yoroheje ya HEV ituma ikirere gisa n'ubururu.
3. Ijisho ntabwo ari ryiza cyane mu guhagarika urumuri rwubururu.
4. Itara ryubururu rishobora kongera ibyago byo kwangirika.
5. Itara ry'ubururu rigira uruhare mu guhuza amaso.
6. Kurinda urumuri rwubururu birashobora kuba ingenzi nyuma yo kubagwa cataracte.
7. Itara ry'ubururu ntabwo ari ribi.
Itara ryubururu rigabanya lens ryakozwe hifashishijwe pigment yemewe yongewe kumurongo mbere yo gutara. Ibyo bivuze ko urumuri rwubururu rugabanya ibikoresho biri mubice byose bigize lens, ntabwo ari ibara gusa. Ubu buryo bwa patenti butuma urumuri rwubururu rugabanya lens kugirango rwungurure urugero rwinshi rwurumuri rwubururu na UV.