I-lens eshintsha umbala isekelwe esimisweni se-photochromatic tautometry reversible, i-lens ingaba mnyama ngokushesha ngaphansi kokukhanya okunamandla nokukhanya kwe-ultraviolet, ivimbe ukukhanya okunamandla futhi ibambe ukukhanya kwe-ultraviolet; Ngemva kokubuyela ebumnyameni, ilensi ibuyisela ngokushesha isimo esingenambala nesisobala ukuze kuqinisekiswe ukudluliswa kwelensi. Ngakho-ke, i-lens eshintsha umbala ifaneleka kakhulu kokubili ukusetshenziswa kwangaphakathi nangaphandle, ikakhulukazi endaweni yangaphandle ukuvimbela ukukhanya okunamandla, i-ultraviolet, i-glare kanye nomunye umonakalo wamehlo, ifaneleka ngaphandle okwengeziwe, amehlo azwela ukugqugquzelwa ukukhanya, ukunciphisa ukukhathala kwamehlo. . Ngemva kokugqoka izibuko ezishintsha umbala, uzobona ngokwemvelo futhi unethezekile ngaphansi kokukhanya okuqinile, ugweme ukunyakaza okunxephezela njengokuklolodela, futhi unciphise ukukhathala kwamehlo nemisipha eduze kwamehlo.