electra, the technology that revolutionises optics. electra is the first electronic eyewear that can adjust the lens's darkening according to ambient light. it does this entirely automatically without a battery and in a few hundredths of a second. electra works like the human eye, only faster: it has unlimited darkness gradations and is almost instantaneous.irid blue lensit is ideal for sunny to moderately bad weather as well as changeable days.adjusts to ambient light within hundredths of a second.