Lens ya Bifocal irashobora kwitwa intumbero nyinshi.Ifite imirima 2 itandukanye yicyerekezo mumurongo umwe ugaragara.Kinini ya lens mubisanzwe ifite ibyangombwa bikenewe kugirango ubone intera.Ariko, ibi birashobora kandi kuba ibyo wanditse kugirango ukoreshe mudasobwa cyangwa intera iringaniye, nkuko mubisanzwe wasangaga ugaragara neza iyo urebye ukoresheje igice cyihariye cya lens. Igice cyo hepfo, nanone cyitwa idirishya, mubisanzwe gifite ibyo wasomye.Kubera ko muri rusange ureba hasi kugirango usome, aha niho hantu humvikana kugirango ushire urwego rwimfashanyo.
Ibyiza bya flat-top bifocal lens.
1.Ubu ni ubwoko bworoshye bwa lens butuma uwambaye yibanda kubintu haba hafi yegeranye ndetse no kure cyane binyuze mumurongo umwe.
2.Ubu bwoko bwa lens bwashizweho kugirango bushoboze kureba ibintu biri kure, ku ntera yegeranye no mu ntera yo hagati hamwe n'impinduka zijyanye n'imbaraga kuri buri ntera.
Ibyiza bya round-top bifocals
1.Abambara barashobora kubona ibintu hafi yuburyo buzengurutse bakareba intera ibintu nibindi bisigaye.
2.Abambara ntibakeneye guhindura ibirahuri bibiri byerekanwe mugihe bombi basoma igitabo kandi bareba TV.
3.Abambara barashobora kugumana igihagararo kimwe mugihe bareba ibintu hafi cyangwa ikintu cya kure.
Niba uha agaciro ubuziranenge, imikorere no guhanga udushya wageze ahantu heza.
Ironderero & Ibikoresho Birahari
 Ibikoresho | NK-55 | Polyakarubone | MR-8 | MR-7 | MR-174 |
 Ironderero | 1.56 | 1.59 | 1.60 | 1.67 | 1.74 |
 Abbe Agaciro | 35 | 32 | 42 | 32 | 33 |
 Uburemere bwihariye | 1.28g / cm3 | 1.20g / cm3 | 1.30g / cm3 | 1.36g / cm3 | 1.46g / cm3 |
 UV Guhagarika | 385nm | 380nm | 395nm | 395nm | 395nm |
 Igishushanyo | SPH | SPH | SPH / ASP | ASP | ASP |
Lens ikora iki?
Indwara ya Bifocal ni nziza kubantu barwaye presbyopiya- imiterere umuntu ahura nazo cyangwa zagoretse hafi yo kureba mugihe asoma igitabo.Kugira ngo ukosore iki kibazo cyerekezo cya kure kandi cyegereye, hakoreshwa lens ya bifocal.Biranga ibice bibiri bitandukanye byo gukosora iyerekwa, itandukanijwe numurongo unyuze kumurongo.Umwanya wo hejuru wa lens ukoreshwa mukubona ibintu bya kure mugihe igice cyo hepfo gikosora hafi-iyerekwa.
