1.523 Ikirahure Bifcoal Semi Yarangije Ifoto Yamafoto

Iyo guhindura ijisho ry'umuntu gucogora bitewe n'imyaka, aba akeneye gukosora icyerekezo cye ukurikije icyerekezo cya kure kandi cyegereye. Muri iki gihe, akenera kwambara ibirahuri bibiri bitandukanye, ibyo bikaba bitoroshye. Niyo mpamvu, birakenewe gusya imbaraga ebyiri zitandukanye zo kuvunika kumurongo umwe kugirango uhinduke lens mubice bibiri. Izo lens zitwa bifocal lens cyangwa ibirahuri bifocal.

Ibikoresho nyamukuru byikirahure ni ikirahure cyiza. Ihererekanyabubasha hamwe nubukanishi nubumashini byikirahure cyikirahure ni byiza cyane, hamwe nigitekerezo gihora cyangirika kandi gihamye kumubiri na chimique.

Ubu bwoko bw'indorerwamo ebyiri-zifite umwanya munini wegereye. Nubwoko butari ishusho yiringira indorerwamo-yumucyo, ishobora gukorwa mubirahuri cyangwa resin. Mubyukuri, E-indorerwamo ya bifocal indorerwamo irashobora gufatwa nkurwego rubi rwinyongera-kure-kure yindorerwamo. Ubunini bwigice cyo hejuru cyurugero rwa lens ni nini cyane, kubwibyo ubunini bwuruhande rwo hejuru no hepfo ya lens birashobora kuba bimwe binyuze muburyo bwo kunaniza prism. Ingano ya vertical prism yakoreshejwe biterwa ninyongera hafi, ari yA / 40, aho y ni intera kuva kumurongo ugabanya kugeza hejuru yurupapuro, na A ninyongera yo gusoma. Kubera ko hafi yo gufatisha amaso yombi ubusanzwe bingana, ingano ya prism ya binocular nayo ni imwe. Iyo prism imaze kunanurwa, firime yangiritse igomba kongerwamo cyangwa gukuramo kugirango ikureho imbere.