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1.56 I-Semi Finished Blue Cut Bifocal Photo grey optical lens
Ngaphansi kokukhanya kwelanga, umbala welensi uba mnyama futhi ukudluliswa kokukhanya kuyehla lapho kushiswa imisebe ye-ultraviolet kanye nokukhanya okubonakalayo kwamaza amafushane. Kulensi yasendlini noma emnyama ukukhanya kuyanda, kufiphala kubuyele ekukhanyeni. I-photochromism yamalensi iyazenzakalela futhi iyabuyiseleka emuva. Izibuko ezishintsha umbala zingakwazi ukulungisa indlela yokudlulisa umbala ngokushintsha kombala welensi, ukuze iso lomuntu likwazi ukuzivumelanisa noshintsho lokukhanya kwendawo ezungezile, linciphise ukukhathala okubonakalayo, futhi livikele amehlo.
