Ilensi ye-Bifocal ingabizwa ngokuthi ilensi enezinjongo eziningi.Inezinkambu ezi-2 ezihlukene zokubona kulensi eyodwa ebonakalayo.Ilensi enkulu ivamise ukuba nencwadi kadokotela edingekayo ukuze uyibonele ibanga.Kodwa-ke, lokhu kungaba futhi incwadi yakho kadokotela yokusetshenziswa kwekhompuyutha noma ibanga eliphakathi nendawo, njengoba ngokuvamile ubuzobheka uqonde lapho ubuka le ngxenye ethile yelensi.Ingxenye engezansi, ebizwa nangokuthi iwindi, ngokuvamile inencwadi yakho kadokotela yokufunda.Njengoba ngokuvamile ubheka phansi ukuze ufunde, lena indawo enengqondo yokubeka lolu hlu losizo lombono.
Inzuzo yelensi ye-bifocal eyisicaba.
1.Lolu wuhlobo olulula kakhulu lwamalensi oluvumela ogqokile ukuthi agxile ezintweni zombili eziseduze nasebangeni elikude ngokusebenzisa ilensi eyodwa.
2.Lolu hlobo lwamalensi luklanyelwe ukunika amandla ukubuka izinto ezikude, ebangeni eliseduze nasebangeni elimaphakathi nezinguquko ezihambisanayo zamandla ebangeni ngalinye.
Izinzuzo ze-round-top bifocals
1.Abagqokile bangabona izinto eziseduze ngesimo esiyindilinga futhi babone ibanga lezinto ngamanye amalensi.
2.Abagqokile abadingi ukushintsha izibuko ezimbili ezahlukene lapho befunda incwadi futhi bebuka i-TV.
3.Abagqokile bangagcina ukuma okufanayo lapho bebheka kokubili into eseduze noma into ekude.
Uma uyayazisa ikhwalithi, ukusebenza kanye nokuqamba izinto ezintsha uze endaweni efanele.
I-Index&Material Iyatholakala
 Okubalulekile | NK-55 | I-Polycarbonate | UMR-8 | MR-7 | MR-174 |
 I-Refractive Index | 1.56 | 1.59 | 1.60 | 1.67 | 1.74 |
 Abbe Value | 35 | 32 | 42 | 32 | 33 |
 I-Gravity ethize | 1.28g/cm3 | 1.20g/cm3 | 1.30g/cm3 | 1.36g/cm3 | 1.46g/cm3 |
 I-UV Block | 385nm | 380nm | 395nm | 395nm | 395nm |
 Idizayini | I-SPH | I-SPH | I-SPH/ASP | I-ASP | I-ASP |
Isebenza kanjani i-bifocal lens?
Amalensi e-Bifocal aphelele kubantu abaphethwe i-presbyopia- isimo lapho umuntu ebona ukufiphala noma ukuhlanekezelwa eduze kokubona lapho efunda incwadi.Ukuze kulungiswe le nkinga yokubona kude naseduze, kusetshenziswa amalensi e-bifocal.Zihlanganisa izindawo ezimbili ezihlukene zokulungiswa kombono, ezihlukaniswa ngomugqa onqamula amalensi.Indawo engaphezulu yelensi isetshenziselwa ukubona izinto ezikude kuyilapho ingxenye engezansi ilungisa ukubona eduze.
