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Iilensi ze-optical ezingwevu ezisikiweyo ezi-1.56 eziLuhlaza okwesibhakabhaka ezisikiweyo ezi-Bifocal
Phantsi kwelanga, umbala welensi uba mnyama kwaye ukuhanjiswa kokukhanya kuncipha xa kukhanyiswa yi-ultraviolet kunye nokukhanya okubonakalayo kwamaza amafutshane. Kwilensi yangaphakathi okanye emnyama ukuhanjiswa kokukhanya kuyanda, kuphinde kukhanye. I-photochromism yelensi iyazisebenzela kwaye iyaguquka. Iiglasi ezitshintsha imibala zinokulungisa ukuhanjiswa ngokutshintsha kombala welensi, ukuze iliso lomntu likwazi ukuziqhelanisa notshintsho lokukhanya okusingqongileyo, ukunciphisa ukudinwa kokubona, kunye nokukhusela amehlo.
