1.523 Gilashin Bifocal Photochromic Photogreey Lens na gani na gani

Yayin da mutum ya yi rauni a idonsa saboda tsufa, yana bukatar ya gyara hangen nesansa daban na nesa da kusa.A wannan lokacin, ya / ta sau da yawa yana buƙatar sanya gilashin biyu daban-daban, wanda ba shi da kyau.Don haka, ya zama dole a niƙa mabambantan iko guda biyu a kan ruwan tabarau ɗaya don zama ruwan tabarau a wurare biyu.Ana kiran irin wannan ruwan tabarau na bifocal ko gilashin bifocal.

Nau'in Fusion:shi ne don haɗa kayan ruwan tabarau tare da babban maƙasudin refractive a cikin yanki mai ma'ana akan babban farantin a babban zafin jiki, kuma ma'anar refractive na babban farantin yana da ƙasa.Sa'an nan kuma gudu a cikin farfajiyar ƙananan yanki don yin lanƙwasa na ƙananan yanki daidai da na babban yanki.Babu ma'anar shata.Karatuttukan ƙarin A ya dogara ne da ikon jujjuyawar F1 na farfajiyar gaban filin hangen nesa, curvature FC na ainihin maƙarƙashiyar baka da rabon fusion.Matsakaicin fusion shine alaƙar aiki tsakanin ma'anar refractive na kayan aikin ruwan tabarau na lokaci biyu, inda n ke wakiltar ma'aunin nuni na babban gilashin (yawanci gilashin rawanin) kuma ns yana wakiltar ma'anar refractive na ƙaramin takarda (gilashin flint) tare da babban darajar, to, rabon fusion k=(n-1)/(nn), don haka A=(F1-FC)/k.Ana iya gani daga wannan dabarar da ke sama cewa a ka'idar, canza yanayin gaban babban farantin, madaidaicin arc da ginshiƙan faranti na iya canza ƙarin digiri na kusa, amma a zahiri, ana samun gabaɗaya ta hanyar canzawa. ma'anar refractive sub-platet.Tebu na 8-2 yana nuna ma'aunin gilashin ƙaramin takarda da aka saba amfani da shi a cikin duniya don kera nau'ikan madubin haɗin fuska daban-daban.