Nta mpungenge - ntibisobanuye ko ugomba kwambara bifocals cyangwa trifocals.Kubantu benshi, umurongo utagira umurongo utera imbere ni byiza cyane.
Ni ubuhe buryo butera imbere?
Lens igenda itera imbere ntabwo ari umurongo wa multifocal eyeglass lens isa neza neza na linzira imwe.Muyandi magambo, lens igenda itera imbere izagufasha kubona neza intera zose utarinze kurakara (no gusobanura imyaka) "imirongo ya bifocal" igaragara muri bifocals na trifocals.
Imbaraga za lens igenda itera imbere ihinduka gahoro gahoro kuva kumurongo kugera kumurongo, itanga imbaraga zukuri zo kubona ibintu neza mumwanya uwariwo wose.
Ku rundi ruhande, Bifocals ifite imbaraga ebyiri gusa - imwe yo kubona ibintu bya kure neza nimbaraga za kabiri mugice cyo hepfo yinzira yo kubona neza intera isomwa.Ihuriro riri hagati yibi bice bitandukanye byamashanyarazi risobanurwa n "umurongo ugaragara" ugabanya hagati yinzira.
Iterambere ryiterambere, rimwe na rimwe ryitwa "nta-murongo wa bifocals" kuko badafite uyu murongo ugaragara.Ariko lens igenda itera imbere ifite igishushanyo mbonera cyiza cyane kuruta bifocals cyangwa trifocals.
Indanganturo ya progaramu itera imbere, mubisanzwe itanga ihumure ryiza nibikorwa, ariko hariho nibindi birango byinshi hamwe nibindi bikorwa byongeweho kimwe, nka fotokromike igenda itera imbere, ubururu butera imbere nibindi nibindi, nibikoresho bitandukanye.Urashobora kubona igikwiye kuri page yacuhttps://www.universeoptical.com/iterambere-yerekana-ibyakozwe/.
Abantu benshi batangira gukenera indorerwamo zamaso menshi nyuma yimyaka 40. Nigihe iyo ihinduka risanzwe ryubusaza mumaso ryitwa presbyopia rigabanya ubushobozi bwacu bwo kubona neza hafi.Kubantu bose barwaye presbyopiya, lens igenda itera imbere ifite inyungu nini zo kwisiga no kwisiga ugereranije na bifocals gakondo na trifocals.
Igishushanyo mbonera cya lens igenda itera imbere itanga inyungu zingenzi:
Itanga icyerekezo gisobanutse ahantu hose (kuruta kubiri cyangwa bitatu bitandukanye byo kureba).
Ikuraho "ishusho yo gusimbuka" iterwa na bifocals na trifocals.Aha niho ibintu bihinduka muburyo butunguranye kandi bugaragara mugihe amaso yawe yimutse hejuru yimirongo igaragara muriyi lens.
Kuberako nta "murongo wa bifocal" ugaragara mumurongo utera imbere, baguha isura yubusore kuruta bifocals cyangwa trifocals.(Iyi mpamvu yonyine irashobora kuba impamvu abantu benshi muri iki gihe bambara lens igenda itera imbere kuruta umubare wambara bifocal na trifocals hamwe.)