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Amalensi okukhanya ampunga anombala oluhlaza okwesibhakabhaka angu-1.56 aqediwe kancane
Ngaphansi kokukhanya kwelanga, umbala welensi uba mnyama futhi ukuhanjiswa kokukhanya kuyancipha uma kukhanyiswa yi-ultraviolet kanye nokukhanya okubonakalayo kwamaza amafushane. Kulensi yangaphakathi noma emnyama ukuhanjiswa kokukhanya kuyanda, kufiphale kubuyele ekukhanyeni. I-photochromism yamalensi iyazenzakalela futhi iyaguqulwa. Izibuko ezishintsha umbala zingalungisa ukudluliselwa ngokushintsha kombala welensi, ukuze iso lomuntu likwazi ukuzivumelanisa nezinguquko zokukhanya kwemvelo, linciphise ukukhathala kokubona, futhi livikele amehlo.
