Lens ya Bifocal
Nigute Wabwira Niba Ukeneye Bifocals
Presbyopia ni imiterere ijyanye n'imyaka itera kutabona neza iyerekwa. Bikunze kugaragara buhoro buhoro; uzaharanira kubona igitabo cyangwa ikinyamakuru hafi kandi mubisanzwe uzimura kure yisura yawe kugirango bigaragare neza.
Hafi yimyaka 40, lens ya kristaline mumaso itakaza guhinduka. Iyo akiri muto, iyi lens iroroshye kandi ihindagurika, byoroshye guhindura imiterere kuburyo ishobora kwerekeza urumuri kuri retina. Nyuma yimyaka 40, lens irakomera, kandi ntishobora guhindura imiterere kuburyo bworoshye. Ibi biragoye gusoma cyangwa gukora indi mirimo yo hafi.
Lens ya Bifocal
Indorerwamo ya Bifocal eyeglass irimo lens ebyiri zifite imbaraga zo kugufasha kubona ibintu intera zose nyuma yo gutakaza ubushobozi bwo guhindura bisanzwe amaso yawe kubera imyaka, bizwi kandi nka presbyopia. Bitewe niyi mikorere yihariye, lens ya bifocal ikunze kwandikirwa abantu barengeje imyaka 40 kugirango bafashe kwishyura ibyangiritse bisanzwe byerekanwa bitewe nubusaza.
Ibishushanyo bitatu bya Bifocal Lens
Utitaye kumpamvu ukeneye urupapuro rwo gukosora hafi-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 cyagenewe gukosorwa hafi-cyerekezo gishobora kuba muburyo butatu:
Ishusho 1
Flat Top ifatwa nkimwe mumurongo woroshye cyane woguhuza noguhuza, niyo mpamvu ikoreshwa cyane bifocal (FT 28mm ivugwa nkubunini busanzwe). Ubu buryo bwa lens nuburyo bumwe muburyo bworoshye kuboneka hafi muburyo ubwo aribwo bwose kandi harimo no guhumuriza. Flat Top ikoresha ubugari bwuzuye bwigice giha uyikoresha gusoma neza ninzibacyuho.
Ishusho 2
Nkuko izina ryerekana uruziga bifocal ruzengurutse hepfo. Byabanje gukorwa kugirango bifashe abambara kugera aho basoma byoroshye. Ariko, ibi bigabanya ubugari bwicyerekezo kiboneka hejuru yicyiciro. Kubera iyi, ibice bibiri bizenguruka ntibikunzwe cyane kuruta ibice bibiri byo hejuru.Igice cyo gusoma kiboneka cyane muri 28mm.
Igishushanyo cya 3: Bivanze
Ubugari bwigice cya Bivanze bifocal ni 28mm. Igishushanyo mbonera nicosmetically lens nziza igaragara ya bifocals yose, yerekana mubyukuri nta kimenyetso cyigice. Ariko, hariho intera ya 1 kugeza kuri 2mm yo kuvanga hagati yingufu zicyiciro hamwe na lens prescription. Uru ruvange rufite ibitekerezo bigoramye bishobora kwerekana ko bidahuye n’abarwayi bamwe. Ariko, ni na lens ikoreshwa hamwe nabarwayi idahuza ninzira zigenda zitera imbere.
