Iyo abantu bafite imyaka 40 cyangwa irenga, amaso yacu aba adahinduka. Biratugora guhindura ibintu bya kure nibintu byegeranye, nko hagati yo gutwara no gusoma imirimo. Kandi iki kibazo cyamaso cyitwa presbyopia.
Intumbero imwe yerekana ikoreshwa mugukarisha intumbero yawe haba hafi cyangwa amashusho ya kure. Ariko, ntibishobora gukoreshwa kugirango ukarishe icyerekezo cyawe kuri byombi. Lens ya Bifocal yongerera icyerekezo cyawe amashusho hafi cyangwa kure.
Lens ya Bifocal igizwe nuburyo bubiri. Igice gito mugice cyo hepfo yinzira kirimo imbaraga zo gukosora icyerekezo cyawe hafi. Ahasigaye lens mubisanzwe ni iyerekwa ryawe.
Lens ya fotochromic bifocal igenda yijimye nkizuba ryizuba iyo ugiye hanze. Zirinda amaso yawe urumuri rwinshi nimirasire ya UV, bikwemerera gusoma no kureba neza icyarimwe. Lens izongera kugaragara mumazu muminota mike gusa. Urashobora kwishimira byoroshye ibikorwa byo murugo utabikuyemo.
Nkuko mubizi bifocals ifite ibyanditswe bibiri mugice kimwe cya lens, igice cyegereye hafi cyitwa "Segment". Hariho ubwoko butatu bwibice bishingiye kumiterere yicyiciro.
Fotochromic flat-top bifocal lens nayo yitwa nka Photochromic D-seg cyangwa igororotse-hejuru. ifite "umurongo" igaragara kandi nibyiza cyane ni itanga imbaraga ebyiri zitandukanye. Umurongo uragaragara kuko guhindura imbaraga birahita. Hamwe ninyungu, iguha umwanya munini wo gusoma utiriwe ureba kure cyane.
Umurongo uri hejuru ya fotokromike ntushobora kugaragara nkuwo hejuru ya fotokromike. Iyo yambaye, usanga itagaragara cyane. Ikora kimwe na fotokromike iringaniye, ariko umurwayi agomba kureba kure mumurongo kugirango abone ubugari bumwe bitewe nuburyo bwa lens.
Photochromic ivanze nigishushanyo cyo hejuru hejuru aho imirongo yakozwe itagaragara cyane muguhuza uturere dutandukanye hagati yimbaraga zombi. Ibyiza byo kwisiga ariko bitera kugoreka ibintu.