A prototype of bifocal eyeglasses uses liquid crystals and electric fields to switch between modes that aid in nearby and distance vision
Več na: https://www.newscientist.com/article/2495072-liquid-crystal-lenses-could-make-better-bifocal-glasses/?utm_campaign=RSS%7CNSNS&utm_source=NSNS&utm_medium=RSS&utm_content=home
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