Lens ya Bifocal
Hamwe nigice mu gice cyo hepfo yinzira, lens ya bifocal yerekana imbaraga ebyiri zitandukanye za dioptricique, ziha abarwayi icyerekezo cyiza kandi cya kure.
Ibipimo
Utitaye kumpamvu ukeneye kwandikirwa hafi yo gukosora iyerekwa, bifocals byose bikora muburyo bumwe. Igice gito mugice cyo hepfo ya lens kirimo imbaraga zisabwa kugirango ukosore icyerekezo cyawe hafi. Ahasigaye lens mubisanzwe ni iyerekwa ryawe. Igice cya lens cyeguriwe hafi yo gukosora icyerekezo gishobora kuba imwe muburyo butandukanye.
Andika ubutumwa bwawe hano hanyuma utwohereze
